What they said.
Rooftops come in three versions: Pure AC, AC/Heat pump and AC/Heat Strip. The latter is what amounts to a space heater built into the rooftop unit, placed in front of the fan. High electricity consumption, fairly effective. A heat pump, easy explanation, is an AC in reverse. You're cooling the outside air and putting the heat inside your bus. Works down to about 35-40ºF....then it looses effectiveness.
Most times you can see what you have at the thermostat. Cycle through the modes..... FURN is propane furnace, AC is AC, Fan is Fan, if you have HP it's heat pump. If you're not sure, take the inside cover off and find a model number.
I've had no luck running the furnace driving. It goes out, fails to restart a few times and gives up until I turn it ff, turn it on. And yes, if you get it to go you'll go through the gas pretty quickly.
I run generator and heat pump when I roll. I try not to be out there when it's below 40º
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2020 RAM 3500 DRW Long Horn. In the hunt for a Palomino TC, formerly a 2017 Berkshire 38A: https://dragonship.blog/
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