Here is a link that some guy is doing in his basement. Doesnt look too expensive.

http://reefcentral.com/forums/showth...5&pagenumber=1

Nice link, thank you!

another link (if you go part way down I placed some other links inside). When I was thinking about it was going to bury PVC in the V between me and the neighbours house. Figure having the moist ground from the runoff in the back yards plus from the downspouts would give better heat transfer that dry ground.

http://reefcentral.com/forums/showth...readid=1289277