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If you built a simple solar water heater that heated a fairly large tank of water stored in your basement, couldn't this be used to augment your ground heat source?
If memory serves me well (seldom) there was an experiment similar to this in Anchorage back in the late 70's. They were able to heat a house for the winter w/o a furnace. But I believe that the thermopile was rather massive.
The idea if drilling shallower holes is great except where the ground freezes down 3-4 feet in the winter time. You need to be well below that in order to find a use able amount of heat.
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