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Testing for radon is often recommended during the winter months because conditions at that time tend to produce the highest and most accurate readings of radon levels in a home.

Here's why:

1. Homes Are More Sealed in Winter

• Windows and doors are typically closed during the colder months to conserve heat.

• This limits ventilation, allowing radon gas (if present) to accumulate indoors.

• The more "closed up" the house is, the higher the radon concentration can get—making it easier to detect.

2. Stack Effect Increases Radon Infiltration

• In cold weather, warm air rises and escapes from the top of the house.

• This creates a vacuum that pulls air (and radon gas) from the soil into the lower levels of the home, especially basements.

• This phenomenon is called the stack effect, and it enhances radon entry.

3. Frozen Ground Traps Radon

• In winter, the ground surface may freeze, trapping radon underground.

• This can force more radon to seep into homes through cracks and openings in the foundation, rather than dispersing into the atmosphere.

4. More Time Spent Indoors

• People spend more time indoors in winter, especially in basements or lower levels, increasing potential exposure.

• This makes it more important to test when the risk of exposure is at its peak.