Equipments for residences with a crawl space, no gravel under the piece (typical in older homes), or a totally ended up basement, reduced level, a garage attic installation, etc. might cost more. Radon can not be seen, scented, really felt, or otherwise detected, besides with an examination. That's why, according to the EPA, the only means to know for sure if you have a radon trouble is to examination. This technique makes use of suction points that are drilled in the subslab (normally 4 to 6 inch holes that resemble hollow pits).