Total Home Inspection Services LLC provides radon testing as an addition to a home inspection, or as a stand-alone service. We use modern continuous digital radon monitors that are calibrated annually and give you the results immediately upon the conclusion of the testing period (48 hours minimum). The results include not only the average exposure over the testing period but also hourly radon levels within the home. This additional information is extremely useful- I have tested several homes where the average radon exposure is below the EPA threshold, but there are drastic spikes in the levels in the middle of the night when it is likely that the home is occupied.
Radon levels within a home can vary with the season, barometric pressure, and the weather. The EPA recommends testing for radon within the home every two years- to determine if you need a mitigation system, or to confirm the efficacy of an installed system.