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How big a pond for heating/cooling average size house?
A friend of mine asked me if their pond is big enough to support year-round heating and cooling using a heat pump for their average size home. I have experience sizing ground loops, air-source equipment and direct exchange ground loops, but I do not have experience suggesting minimum pond size for heat exchange applications. If you have done such an install and it worked OK, can you tell me where it was, how many gallons the pond held and how many feet of piping you used in the pond exchanger coil at minimum? Basically, I'm looking for a safe recommendation of pond size (total gallons) which makes switching to a pond loop more practical than a ground loop. Any feedback from someone who has done this before is appreciated greatly. Thank you!