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Keep in mind that water is ~800 times denser than air, so the latent heat in 1 cubic foot of ground water at ~50 degrees F has vastly more energy than 1 cubic foot of ambient air at 25 degrees F. So, much less water is needed to supply a given amount of heat.
My lot has a very fortunate location, at the foot of a hill and on a lake. The natural subsurface flow of the ground water is downhill to the lake, so the groundwater comes for free, courtesy of gravity. No need for a pump or well, although immersing a heat exchanger in the lake would work almost as well, although the lake water is colder in winter than the groundwater.
Regardless of the source of heat or air conditioning, it is vital to have a well insulated house, which will then need less heat from any source than a drafty house.
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