To me it makes the most economical sense. Indoors and you want 75 degree air and 65 degree water then you pay to cool the water and pay to warm the air. Keep the indoor air temp the same as the water temp or the way that it works is you pay to warm the air, the air transfers heat to the cooler water raising the temp of the water and then you pay again to remove the heat from the water. Put on a jacket or pay a whole bunch to fight air temp and water temp against each other. Your call.

Last edited by Bill D.; 02/17/15 08:06 AM. Reason: Clarification

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