When is the best time of year to perform radon testing?

Answer: Winter
Explanation: Radon testing can occur at any time throughout the year, however testing during the winter months when heating systems are running is considered the optimal time to test.

Answer: Winter
Explanation: Winter tends to provide the highest radon level in homes due to the stack effect, however when involved in a home purchase, the radon test needs to be performed during the inspection contigency.

Answer: There is no significant difference.
Explanation: However, radon can be highre in the winter due to stack affect ...warm air rising to the upper portion of the house can pull air up from the basmenet, and up through the slab.

Answer: There is no significant difference.
Explanation: This seems to be a matter of opinion, I haven't seen true data in my testing to say it's a certain time of year. Due to it being a gas, the barometric pressure can dictate the levels. If your performing a long term test, I recommend doing it mid spring or mid fall. Testing during those times gives a balanced test in my opinion.

Answer: Unsure
Explanation: There is no good answer to this question. Radon will be higher in the winter months if the ground is frozen but the numbers can still be higher during the spring , summer , or fall if the ground is saturated with water.

Answer: There is no significant difference.
Explanation: It depends on how the property is used. In the winter properties usually have less fresh air flow from being closed up because of the cold weather. It is best to test a home for 12 months, but that's not practical.