Commodore Joe Redcloud© wrote:
Groundwater heating and cooling works just as well in North Dakota as
it does in Dallas Texas. This sort of thing is no longer "news"

You can keep your house at a comfy 72 degrees in the winter using 52
degree ground water.

How can you warm your house to 72 degrees with an outdoor ambient of 30
degrees and a ground water temperature of 52 degrees?