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Old 03-21-18, 11:54 PM   #5
jeff5may
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To the to wit question: no. In this configuration, all the heat pump is going to do is offset the temperature gradient outdoors from indoors. The fraction of heat grabbed outdoors from the solar preheating circuit is transported (at electrical power cost) indoors. The increase in COP is the useful energy gleaned from the preheating rig.
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