When performing a Radon Test closed-house conditions must be maintained during the entire time of the test. Operation of the home’s heating and air conditioning systems(not evaporative coolers) normally during the test.
Do not disturb the test device at any time during the test.
If a radon-reduction system is in place, make sure the system is working properly and will be in operation during the entire radon test.
After a Radon Test
EPA recommends that you fix the home when the radon level is 4 pCi/L or more. If an elevated level of radon gas is found, the home will require a radon mitigation system to be installed. Contact a qualified radon mitigation contractor about lowering the radon level.
The EPA’s Consumer’s Guide to Radon Reduction
The Environmental Protection Agency website provides the guidelines for radon mitigation.