I tested my basement for radon, and found that it was twice the allowable level (8 pCi/L). Can I use an air-to-air heat exchanger to reduce the radon level, and to pump fresh clean air into my basement and the rest of the house? How effective are these compared to conventional radon reduction systems?
My house was built in 1915, and the basement floor was repoured and the walls resurfaced a few years ago - I don't think that I can reduce the radon by sealing cracks.
In addition to reducing radon, the air-to-air heat exchanger would also reduced other pollutants that are generated inside the house - I don't understand why it isn't used more instead of conventional radon removal techniques.