My roommate works for a HVAC company that specializes in geothermal installations. Next time he is home I will try and get him to post some information regarding costs, capabilities and efficiencies.
Off hand I seem to remember most installations running from 10-18k depending on the situation. The systems run around 5:1 efficiency for AC. This means for every one watt of electricity used to run the system you get the equivalent of 5 watts of cooling. I believe it is even more efficient for heating, but I don't recall for sure.
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