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Oh, I know a guy who installs solar pool heaters. I think they're radiator-type heat exchange solar panels (not photovoltaic electrical collectors) that go on the roof, and a pump system circulates the liquid to provide heating through a coil/fan exchange system. If I'm not mistaken they're pretty cheap. The biggest cost is in the panels themselves. Everything else is from the pool supply aisle at Home Depot.
"Science and Mother Nature are in a marriage where Science is always surprised to come home and find Mother Nature blowing the neighbor." - Justin's Dad
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