Quote:
Originally Posted by Ashartus
For borderline results you might also want to consider how you use your basement (presuming that is where you did the test). Radon is usually higher in the winter and often higher at night. If you are using the basement extensively or have a bedroom down there that might tip you towards doing it; if your basement is more for storage it is less of a concern.
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The difference between floors is about 15%. I might be mistaken on why that exactly happens but it might have something to do with the hole under the furnace that pulls the air up and through your house.