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This was taken off of the Fujitsu web site. My mini split has no backup heat. It does have a small heater on the bottom pan to prevent ice buildup in extreme cold weather. It did keep my home warm in 2 degree weather.
“The Extra Low Temperature Heating (XLTH) Series features outdoor condensing units engineered to operate in temperatures down to -15°F.”
Air temp has a heat pump that will heat without any backup heat down to -22 degrees and put out 89% of its rated capacity. You probably wouldn’t install a heat pump in your camper.
Lynwood
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