Our 2011 Sunseeker has the Dometic 15,000 btu/hr air conditioner/heat pump. The thermostat on ours is not the same as is used in the current models, but they probably work the same.
There is a temperature sensor on the roof-mounted unit. The defrost cycle is controlled by the thermostat reading the sensor. The heat pump starts to periodically go through the defrost cycle when the outside temperature goes below 42 F. If the outside temperature goes below 30 F it shuts off the heat pump entirely and switches to the propane furnace.
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