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I have miles of cw pipe cooling my radiant floor slab, during cooling season I flip some valves and almost all the domestic water goes thru the floor first. No AC in that addition but it keeps it cool enough but only cost a couple valves.
I like the idea of Geothermal Heat pumps but the in installed cost is too high IMO(15-20 year paybacks). I'll be going air cooled heat pump when my AC dies. I have propane heat so with use it as 2nd stage when below 30 degrees F or with lite the wood stove those days.
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