Radon Knowledge Base

Retesting After Remodels and System Changes

After a remodel, waterproofing change, sump change, or radon system adjustment, homeowners often wonder when to retest and what a new result means. This reference page collects those retest and system-change questions in one place. American Radon Systems does not perform the testing, but the company can help homeowners understand what mitigation details may need review when a result changes after work on the home.

What if my radon number changed after basement finishing when the home is newer?

After basement finishing when the home is newer, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02701

Does waterproofing mean my old radon result is outdated when the home has changed?

After waterproofing when the home has changed, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02702

Can radon readings change after a week of cold weather when the fan is quiet?

After a week of cold weather when the fan is quiet, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02703

How long should I wait to test after floor crack sealing when the basement is used every day?

After floor crack sealing when the basement is used every day, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02704

Should I retest for radon after basement finishing during summer?

After basement finishing during summer, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02705

How long should I wait to test after a new HVAC system when the basement is used every day?

After a new HVAC system when the basement is used every day, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02706

Should I retest for radon after buying a house with a home office downstairs?

After buying a house with a home office downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02707

What if my radon number changed after new windows with a crawlspace nearby?

After new windows with a crawlspace nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02708

Does mitigation mean my old radon result is outdated during winter?

After mitigation during winter, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02709

Can radon readings change after turning on a passive fan when the home is newer?

After turning on a passive fan when the home is newer, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02710

How long should I wait to test after crawlspace work with kids downstairs?

After crawlspace work with kids downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02711

Should I retest for radon after new windows when the result is between 2.0 and 4.0?

After new windows when the result is between 2.0 and 4.0, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02712

What if my radon number changed after moving a home office downstairs when the home has changed?

After moving a home office downstairs when the home has changed, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02713

Does mitigation mean my old radon result is outdated when the test is for peace of mind?

After mitigation when the test is for peace of mind, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02714

Can radon readings change after waterproofing when the fan is quiet?

After waterproofing when the fan is quiet, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02715

How long should I wait to test after renting out a basement when the kit instructions are unclear?

After renting out a basement when the kit instructions are unclear, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02716

Should I retest for radon after basement finishing when the monitor disagrees?

After basement finishing when the monitor disagrees, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02717

What if my radon number changed after renting out a basement when the basement is used every day?

After renting out a basement when the basement is used every day, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02718

Does buying a house mean my old radon result is outdated with pets downstairs?

After buying a house with pets downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02719

Can radon readings change after a new HVAC system when the home is newer?

After a new HVAC system when the home is newer, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02720

How long should I wait to test after moving a home office downstairs during summer?

After moving a home office downstairs during summer, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02721

Should I retest for radon after a week of cold weather with a sump pit nearby?

After a week of cold weather with a sump pit nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02722

What if my radon number changed after turning on a passive fan when the test is for peace of mind?

After turning on a passive fan when the test is for peace of mind, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02723

Should I retest for radon after a high short-term test with pets downstairs?

After a high short-term test with pets downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02724

What if my radon number changed after buying a house with a dehumidifier running?

After buying a house with a dehumidifier running, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02725

Does a new sump cover mean my old radon result is outdated with kids downstairs?

After a new sump cover with kids downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02726

Can radon readings change after new windows when the house has drain tile?

After new windows when the house has drain tile, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02727

How long should I wait to test after a weird monitor spike when the monitor disagrees?

After a weird monitor spike when the monitor disagrees, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02728

Should I retest for radon after new windows after buying?

After new windows after buying, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02729

What if my radon number changed after adding a bedroom downstairs when the lower level is unfinished?

After adding a bedroom downstairs when the lower level is unfinished, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02730

Does basement finishing mean my old radon result is outdated with HVAC running a lot?

After basement finishing with HVAC running a lot, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02731

What if my radon number changed after renting out a basement with a dehumidifier running?

After renting out a basement with a dehumidifier running, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02732

Does new windows mean my old radon result is outdated with HVAC running a lot?

After new windows with HVAC running a lot, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02733

Can radon readings change after a basement leak repair with kids downstairs?

After a basement leak repair with kids downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02734

How long should I wait to test after adding a bedroom downstairs with pets downstairs?

After adding a bedroom downstairs with pets downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02735

Should I retest for radon after floor crack sealing with HVAC running a lot?

After floor crack sealing with HVAC running a lot, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02736

What if my radon number changed after basement finishing when a neighbor has a different result?

After basement finishing when a neighbor has a different result, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02737

Does heavy rain season mean my old radon result is outdated when the home is newer?

After heavy rain season when the home is newer, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02738

Can radon readings change after a basement leak repair after opening windows?

After a basement leak repair after opening windows, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02739

Does a new HVAC system mean my old radon result is outdated when the result is between 2.0 and 4.0?

After a new HVAC system when the result is between 2.0 and 4.0, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02740

Can radon readings change after a high short-term test when the lower level is unfinished?

After a high short-term test when the lower level is unfinished, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02741

How long should I wait to test after a basement leak repair when a neighbor has a different result?

After a basement leak repair when a neighbor has a different result, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02742

Should I retest for radon after adding a bedroom downstairs when the test is for peace of mind?

After adding a bedroom downstairs when the test is for peace of mind, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02743

What if my radon number changed after a basement leak repair when the result is above 4.0?

After a basement leak repair when the result is above 4.0, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02744

Does basement finishing mean my old radon result is outdated after finishing the basement?

After basement finishing after finishing the basement, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02745

Can radon readings change after floor crack sealing when the monitor disagrees?

After floor crack sealing when the monitor disagrees, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02746

How long should I wait to test after floor crack sealing when a realtor is asking?

After floor crack sealing when a realtor is asking, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02747

Should I retest for radon after renting out a basement when a neighbor has a different result?

After renting out a basement when a neighbor has a different result, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02748

What if my radon number changed after buying a house with kids downstairs?

After buying a house with kids downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02749

Does a weird monitor spike mean my old radon result is outdated when a realtor is asking?

After a weird monitor spike when a realtor is asking, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02750

Can radon readings change after a basement leak repair with HVAC running a lot?

After a basement leak repair with HVAC running a lot, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02751

How long should I wait to test after a family member moving downstairs with a sump pit nearby?

After a family member moving downstairs with a sump pit nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02752

Should I retest for radon after a weird monitor spike when the fan is quiet?

After a weird monitor spike when the fan is quiet, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02753

What if my radon number changed after heavy rain season when the basement is used every day?

After heavy rain season when the basement is used every day, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02754

Does buying a house mean my old radon result is outdated when a neighbor has a different result?

After buying a house when a neighbor has a different result, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02755

Can radon readings change after mitigation with HVAC running a lot?

After mitigation with HVAC running a lot, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02756

How long should I wait to test after basement finishing when the fan is quiet?

After basement finishing when the fan is quiet, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02757

Should I retest for radon after adding a bedroom downstairs with a crawlspace nearby?

After adding a bedroom downstairs with a crawlspace nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02758

What if my radon number changed after heavy rain season when the home has changed?

After heavy rain season when the home has changed, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02759

Does a sump pump replacement mean my old radon result is outdated before selling?

After a sump pump replacement before selling, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02760

Can radon readings change after new windows with a home office downstairs?

After new windows with a home office downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02761

How long should I wait to test after turning on a passive fan when the result is above 4.0?

0, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02762

Should I retest for radon after turning on a passive fan during winter?

After turning on a passive fan during winter, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02763

What if my radon number changed after moving a home office downstairs with a sump pit nearby?

After moving a home office downstairs with a sump pit nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02764

Does crawlspace work mean my old radon result is outdated after a rainy week?

After crawlspace work after a rainy week, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02765

Can radon readings change after adding a bedroom downstairs with a crawlspace nearby?

After adding a bedroom downstairs with a crawlspace nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02766

How long should I wait to test after a new HVAC system with a dehumidifier running?

After a new HVAC system with a dehumidifier running, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02767

Should I retest for radon after new windows with a home office downstairs?

After new windows with a home office downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02768

What if my radon number changed after heavy rain season after finishing the basement?

After heavy rain season after finishing the basement, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02769

Does new windows mean my old radon result is outdated after opening windows?

After new windows after opening windows, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02770

Can radon readings change after a basement leak repair when a neighbor has a different result?

After a basement leak repair when a neighbor has a different result, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02771

How long should I wait to test after floor crack sealing after opening windows?

After floor crack sealing after opening windows, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02772

Should I retest for radon after turning on a passive fan with kids downstairs?

After turning on a passive fan with kids downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02773

What if my radon number changed after a basement leak repair with a sump pit nearby?

After a basement leak repair with a sump pit nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02774

Does a week of cold weather mean my old radon result is outdated after opening windows?

After a week of cold weather after opening windows, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02775

Can radon readings change after buying a house with a home office downstairs?

After buying a house with a home office downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02776

How long should I wait to test after heavy rain season during winter?

After heavy rain season during winter, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02777

Should I retest for radon after mitigation when the fan is quiet?

After mitigation when the fan is quiet, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02778

How long should I wait to test after crawlspace work when the house has drain tile?

After crawlspace work when the house has drain tile, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02779

Should I retest for radon after basement finishing before selling?

After basement finishing before selling, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02780

How long should I wait to test after turning on a passive fan when the house has drain tile?

After turning on a passive fan when the house has drain tile, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02781

Should I retest for radon after waterproofing when the lower level is unfinished?

After waterproofing when the lower level is unfinished, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02782

What if my radon number changed after new windows when the kit instructions are unclear?

After new windows when the kit instructions are unclear, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02783

Does waterproofing mean my old radon result is outdated when the fan is loud?

After waterproofing when the fan is loud, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02784

Can radon readings change after a basement leak repair when the fan is quiet?

After a basement leak repair when the fan is quiet, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02785

How long should I wait to test after waterproofing before finishing the basement?

After waterproofing before finishing the basement, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02786

Should I retest for radon after moving a home office downstairs with a home office downstairs?

After moving a home office downstairs with a home office downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02787

What if my radon number changed after renting out a basement before selling?

After renting out a basement before selling, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02788

Does a sump pump replacement mean my old radon result is outdated when the result is above 4.0?

After a sump pump replacement when the result is above 4.0, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02789

Can radon readings change after a family member moving downstairs before finishing the basement?

After a family member moving downstairs before finishing the basement, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02790

How long should I wait to test after waterproofing with a sump pit nearby?

After waterproofing with a sump pit nearby, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02791

Can radon readings change after heavy rain season when the house has drain tile?

After heavy rain season when the house has drain tile, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the number keeps coming back high, American Radon Systems can explain what a quality mitigation plan would look like for that house.

#p4-02792

How long should I wait to test after floor crack sealing with kids downstairs?

After floor crack sealing with kids downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02793

Can radon readings change after a weird monitor spike when the fan is quiet?

After a weird monitor spike when the fan is quiet, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02794

How long should I wait to test after a basement leak repair before finishing the basement?

After a basement leak repair before finishing the basement, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02795

Should I retest for radon after a week of cold weather with pets downstairs?

After a week of cold weather with pets downstairs, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02796

What if my radon number changed after waterproofing when the result is borderline?

After waterproofing when the result is borderline, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If something about your system seems off, call or text Bill. He can often tell you over the phone what to check first, and he can stop out if it needs eyes on it. No trip charge.

#p4-02797

Should I retest for radon after a new HVAC system during winter?

After a new HVAC system during winter, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02798

What if my radon number changed after basement finishing before selling?

After basement finishing before selling, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If the result is elevated or confusing, call or text Bill and he can talk through what mitigation would involve.

#p4-02799

Does a family member moving downstairs mean my old radon result is outdated after opening windows?

After a family member moving downstairs after opening windows, retesting is a practical way to find out what changed instead of guessing. Use a valid test window and place the test where it represents the lowest lived-in space or the area people actually use. One odd reading is less useful than a clear average under normal conditions. If you already have a result, Bill can help you understand the mitigation side of the next step.

#p4-02800

Related Help

Questions are fine too. Call or text Bill, or send your address and contact info, and he will take it from there.

Reviewed by Bill Dahlstrom, Illinois radon mitigation license RNM2018212.