NiHao,
The compressor by definition superheats in the AC mode. Even with low inlet temps. I have worked with my cousin in northern Vermont that have very low inlet ground water temps (44 F, open loop "pump and dump" geothermal) and the desuperheater provides LOTS of hot water in the summer on those days when AC is being used.
Something is amiss . . . .
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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