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I know of one installation of a ground source heat pump here in Alaska using radiant floor heating. Circulates glycol thru a network of pipes laid below ground to the cold side of the heat pump. The hot side circulates into a water storage tank and thru the radiant floor loop. But they also have a supplemental gas-fired boiler. The downside of ground source heat pumps in really cold climates is that you essentialy have to freeze the already frozen ground to get any significant heat out of it. That is unless you have a really deep source like the wells that Richard mentions.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
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