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Short term testing: 48-60 hrs Closed Building Conditions

Typical for a real estate transaction

Certain conditions must be maintained for the testing environment, which lasts from 48-60 hours, in order to ensure a valid test takes place and that an accurate reading(s) can be taken for analysis.  If the house is occupied, a responsible adult occupant will need to agree to maintain these conditions listed below to provide an ideal environment during the testing period.

Radon Free Sold Home
Radon test door hanger
  • Close all of your windows on every level and all outside doors at least 12 hours before beginning the test.
  • Throughout the test, "closed house conditions" must be maintained. This means keeping all windows and doors remain closed for the duration of the test.
  • Keep outside doors closed except for normal momentary entry and exit.
  • Do not operate fans or other machines that bring in air from outside. That includes swamp coolers.
  • Fans that are part of a radon-reduction system or small exhaust fans such as kitchen and bathroom fans may operating for only short periods of time during the test.
  • Central heating and air conditioning systems are permitted, but wall/window air conditioning units that are set to exchange air are not.
  • Use air conditioning (central/window units on recirculate modes only) and fans to keep cool (excluding whole house fans). Be sure fans are not directed at the test device. Some test devices are very sensitive to air flow.

Throughout the seasons, it can be challenging to stick to radon testing requirements for closed-house conditions.  The urge for homeowners/occupants to open windows and doors is strong. But doing so during a radon test could actually make the test read higher than it should, could extend the time for the test and can void the test completely, requiring a re-test to be re-done, sometimes at the owner's expense.  If you don't understand something, ask!

Call the Radon Lady if you are unsure of what you can and cannot do.

I look forward to helping you find out the level of radon in your home, and giving you the information you need to make an informed radon decision.

Please call with any questions, Julia, The Radon Lady

505-670-6738 or Contact Me by email


Contact Us to Schedule a Radon Test 505-670-6738

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