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I would suspect that you have the Arctic package. I had it on my 2003 unit. The furnace runs through the belly of the unit and heat radiates into the belly. There is a layer of insulation in the belly pan. As long as you keep the thermostat set on 55 or above, it should keep the internal lines from freezing.
In winter, my external lines are protected with heater tape. Last winter there was no problem with freezing. We are full timing in the unit. In Illinois, if your unit will be stored, then you need to winterize it. You probably knew that, but I mention it just in case.
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Hybrid Mode
