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Old 06-05-13, 10:40 PM   #2
Mobile Master Tech
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If you expect the evaporator (cold) side to stay frost free, you will have to use a limit thermostat (cheap on fee-bay) of some sort to keep it above 32F. If outside air is your heat source, perhaps you can emulate features of mini-split heat pumps, but the efficiency will plummet. The features your unit came with probably won't work-they are designed for the limited amount of moisture in a closed freezer and usually involve shutting off the compressor, then using an electric heating element to melt frost, then restart the system.

You could hack the system and create a GSHP using antifreeze in the liquid loop, also. Lots of good info, especially in AC Hacker's "Heat Pump Manifesto".
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