Dwight has his geo coils in his pond and it's kept his house heated in very cold temps without the backup element kicking on.

I think the biggest thing is finding a geo installer/expert that knows what he's (or they) are doing.

My neighbor had a heat pump installed about 2 years ago, and for most of the first year he saw higher utility bills. Compressor problems and other issues that could be traced back to the installer and the person who spec'd. out the unit.


www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).