Radon Testing - Seasonal Differences

Radon levels can vary throughout the year, with levels typically being higher during the winter months than during the summer. This is largely due to seasonal changes in how the home is operated and ventilated.

During the winter, windows and doors are generally kept closed, heating systems are operating, and the temperature difference between the inside and outside of the home can create a stronger stack effect. This can cause more soil gas, including radon, to be drawn into the home. In the summer, increased ventilation and more frequent opening of windows and doors can allow radon to disperse, often resulting in lower readings.

Because of these seasonal variations, a radon test conducted during the summer may produce a lower result than a test performed under typical winter conditions. A single test represents the radon concentration during that specific testing period and should be interpreted accordingly.

For a better understanding of a home's long-term radon exposure, long-term testing is recommended, particularly when seasonal variations are a concern.