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Bumping for more info. A company makes one now called a Hotspot FPH. I'm seriously considering buying, and know the principles of operation and it all makes sense, I'm just looking for a real review or input from others.

Mark, pretty sure that's not the case. The system says it comes with a controller and an automatic divert valve for one. Anytime the controller is satisfied with water temp, the unit runs like a normal A/C. Number two, I don't know where you're pulling geothermal from, this system appears to...