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Originally Posted by Bill the Engineer
A/C and heat are both from the geothermal heat pump.
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I don't remember to have ever seen one.
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There are also solar panels out back to provide much of the power during the day. The house is carbon neutral by design.
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Interesting. Well, I guess the savings from that approach would eventually be enough for you to pick some other cars and slap a Prius drivetrain into them