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We paid about $14,000 for our geo installation in a new home, but we did all of the trenching/line installation ourselves. We ran 5 horizontal lines in 100 ft trenches for a 1000 total line length for the lines (out & back 100 ft = 200 times 5 lines = 1000). My hubby stood by an old trencher for a month to save us about $6500. It was worth the time/work.
We built a very green home system. We live in a styrofoam house (love to say that) using Structurally Insulated Panel systems (SIPS). Each 8' piece of wall is 6" of foam surrounded by OSB, no studs, no air space, no heat loss. The ceilings are 12" thick foam. No attics, all vaulted ceilings. It's like living in an upside down beer cooler.
(I will tell you that electricians don't love SIP panels but my heat bill is well worth his discomfort.)
We also did on-demand water heaters, and in-floor radiant heat pipe in the basement concrete. We did the in-floor ourselves as well for about 25% of retail cost. We run the water pipes over the geo compressor to collect that heat and get much of our water heated for free through that process.
Expensive to maintain geo? well I haven't seent that yet, but the house was new in Feb 2007 so time will tell on that issue. I am unsure of the cost difference to maintain forced air over geo. But I think the geo is a healthier type of heat than the forced air.
Kermit was wrong, it's easy being GREEN, but it's probably not cheap.