Buton the other hand, Sennhauser says there's no magicbullet forgetting around DPIasuserscanusuallyonlytemporarilyeludeitby "findingflaws in theirsystem."
"I know they're being overpriced because everybody thinks they're magic, and they're selling it asmagic, " says James Bose, a professor at Oklahoma State University and executive director of the International Ground Source Heat Pump Association.