When it's 45F outside and the rig needs interior heat, which source (Heat pump,furnace,fireplace) draws the least power (or is the most power efficient)??
Appreciate your responses in advance.
Heat pump totally ineffective when temps drop into the 40's.... I'd use a combo of fireplace and ceramic heater.... I'd use furnace as last resort because it relies on propane which I tend to conserve as much as I can....
We place two ceramic heaters (one in bedroom area and one up front) and they keep things toasty - plus your using CG's elec not your propane....