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Old 12-22-2019, 08:51 AM
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There are a number of ways to implement the pipes in the ground:

- deep bore holes (a few hundred feet) with pipe up and down. This is a good approach when you don't have a lot of land.
- horizontal pipes a few feet down over a fairly large area.
- circular coils of pipe about 6 feet in diameter in holes about 10 feet deep. I only saw one install of this type so I am recalling the dimensions from memory.
- pipes can also be installed in a nearby lake.
- if you have well water then you can run well water through the heat exchanger and then dump the water back into the ground or a lake.

Quote:
Originally Posted by stadry View Post
several feet below grade, isn't the earth's ambient temp's always the same ? absent frost, of course, but even 2' below frost line, temp should be 65f +/-,,, this link may be helpful