pool pump

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Well do some research on ground source heat pumps then, in particular in a cold climate. In a horizontal loop configuration,in the heating mode the pipes get cold, even making frost below the frost line. Mositure in the soil will migrate towrds the pipes.
These type of systems extract a lot of latent heat from the ground, and can you can use less pipe per nominal ton than places in warmer climates with dryer soils and no snow cover.
In air conditioning mode, the pipes become warm and moisture tends to migrate away from the pipes.
Perhaps search "moisture migration" & "ground source heat pumps" and avoid the atricles that deal with buildings having moisture migration problems through the building envelope. It is a difficult concept to properly allow for in the calculations, a lot of papers out there discuss the difficulties in adequately allowing for mositure migration to the cold pipes.
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Ah, the Mayflower. I have sailed in her - literally.
http://tinyurl.com/79svq
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