Best Time of Year to Test for Radon

Radon can be tested for at any time of year, but fall and winter tend to be a particularly relevant window, and here's why: during heating season, homes are generally sealed up more tightly — windows closed, exterior doors used less, less natural ventilation overall.

That reduced air exchange can allow radon to accumulate to somewhat higher concentrations than during warmer months when windows are open more often.

Is Summer Testing Accurate?

That doesn't mean summer testing is inaccurate or pointless — a properly conducted 48-hour test is a reliable short-term snapshot regardless of season.

But testing during a period that reflects your home's typical "closed-house" conditions (which is most of fall and winter for most homes) gives a result that's more representative of what your indoor radon levels look like during the months you're most likely to be affected.

Why January Is National Radon Action Month

This seasonal pattern is also part of why January is designated National Radon Action Month by the EPA — it lines up with when radon awareness and testing activity naturally peaks, and when the conditions that concentrate radon are most active.

When Should You Test?

If you've been meaning to test but keep putting it off, heating season is a genuinely good, low-effort time to just get it done — you're not changing your routine to accommodate closed-house conditions, since that's already how most people naturally live during colder months.

Schedule a radon or mold test today with DezAir Quality Testing online at dezairqualitytesting.com.