Concerning using pool water to provide the heat sink for whole house A/C I don't think heating the pool water too much would be a problem. Just don't cover it at night if it gets too warm. There are a couple advantages to water to freon exchangers, as opposed to freon to air. Quieter...no big fan, motor, power consumption. Smaller size than the fan cooled assembly. All you need is a small donkey pump when the pool pump isn't running. Heat goes into something useful like heating the pool instead of the great outdoors. If I had central A/C for the house here in NE PA I'd definitely be using the pool water.
My nickels worth.
Al
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