Thor Forums

[Travelin' Texans]

Even with the heat pump if it can't maintain the tstat set point the furnace will kick in til the inside temp catches up.
Typically if the inside temp is 3-5 degrees below the tstat setting when starting the heat pump & the furnace will start til it warms up, likewise if the indoor temps drops 3-5 degrees while the heat pump running the furnace will fire up til temps catch up.
If boondocking not only will you need plenty of propane for the furnace but also good fully charged batteries as the furnace fan is 12 volt. The furnace is not only a propane hog but will use up a fully charged battery rather quickly if running continuously. Once your batteries are dead, no furnace, no fridge, no lights, no hot water, NO water & won't be able operate slides or awnings, unless you have a generator. The furnace, fridge, & water heater all need 12 volts to power the control boards whether operating on LP or shore power, the other items mentioned are strictly 12 volts.
I'd recommend the oil filled radiator type heaters to augment the furnace, they cost a bit more but are not the fire hazard like the other types if pets or children get near them or knock them against flammable materials.