can you tell me about the +'s and -s of using this as a heeting and cooling system. I've seen it used on some TV sows recently.

Ned,
I need practical info too. You'll find lots of stuff at "www.geoexchange.org" I have a pile of information on this system now, and am convinced it is the way to go, but I'd like a third party (not someone selling the things) to give advice too!
Help us out oh HVAC gurus!
Other good source is "waterfurnace"