Equipments for residences with a crawl space, no gravel under the slab (common in older homes), or a totally completed basement, reduced degree, a garage attic room setup, etc. might set you back more. Radon can not be seen, scented, felt, or otherwise identified, besides with an examination. That's why, according to the EPA, the only means to know for sure if you have a radon problem is to test. This technique uses suction points that are drilled in the subslab (typically four to 6 inch holes that appear like hollow pits).