I agree with Russ, dont understand much about this, but have studied it some. In the winter, you want the earths heat to be cycled into your home. Here in Texas, the below ground temp is between 60 and 65 degrees, year round. So in the winter, colder air could be warmed to about 60 degrees with this system. The real benefit, for TX, comes with summer. At over 100 degrees outside, your run your cooling systems air through the system which cools it greatly, without Freon, or a compressor. If more cooling is needed, a compressor comes on in addition to the ground system. But it takes the air from hot to much cooler without a refrigeration system.

Nick Smith