Choose the best test, you can test for radon two ways:
DIY tests. Buy radon test kits at home centers or through National Radon Program Services. Testing takes two days to a year in a closed-up house before you return the test to a laboratory for the results. Radon levels vary daily, so longer tests mean greater accuracy. Retest after making repairs.
Professional tests. A trained radon professional's electric monitor shows how radon levels fluctuate during the test period. Home buyers may trust professional tests more because they are performed independently of home sellers.
Fix the problemIn general, treat radon reduction like any home improvement and obtain multiple bids before hiring a contractor. Fixing most radon problems costs $800 to $2,500, according to the National Radon Safety Board, one of two organizations maintaining lists of radon contractors. The National Environmental Health Association offers a list of questions to ask your radon contractor. The EPA has links to your state's radon control agency.
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