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Old 11-05-2014, 08:33 AM   #11
City: North Charleston, SC
Country: USA
Join Date: Sep 2010
Posts: 4,385
Originally Posted by caltexflanc View Post
I think Ron's point is that the water is almost always cooler than the air during warm weather, and warmer than the air during cool weather...............
That is exactly my point and the unit will be more efficient because of the greater temperature difference.

One of the most efficient heat pump designs for residential and commercial systems is the "geothermal" system. This system uses piping buried in the ground or water drawn from wells because the earth temperature is cooler than the air in the cooling system and warmer than the air in the heating season.

Put another way, you can get more heat from warm earth (or water) than from cold air. And discharge heat more effectively into cold or cooler earth or water.
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