We face the same situation on our 2016 FC27FB. I admit I did not read every entry into this thread but will run to offer what works for us on sub zero temps.
Two Voronado ceramic space heaters: one under dinette, one in the opposite side, in the bedroom behind the head's bulkhead, in the corner. The first one in max (1.5KW) the second on half that wattage. Both thermostats set at 70F
Furnace thermostat at 50F
The goals is to save on propane, as we get unlimited juice from the city but propane is not. Auto switch regulator on top of propanes.
2 heat lamps under the tanks, surrounded by boards and thick styrofoam glued/screwed to it. Lamps not close to the edges to avoid burning/melting the styrofoam.
Head sink always dripping. Gray tank valve open.
Hot air has it's own ideas, regardless of where we point it at: it rises. To reach even the thermostat at the Furnace/AC control, it will have to first heat the top, including the very cold interior skin of the AS. Should the temp at that point reach 50 F or below, the furnace is my fallback freeze preventer.
Heat starts rising from the lamps below the belly. Then from the two Voronado, Furnace is the last resort but I figure before temp reaches 50F at that point, is has to be above freezing at the lowest point: the pipes and tank. So far it worked.
I tried cheap $24 heaters from Lowes and expensive $500 Dyson. The cheap ones worry me about fires or failure (one stopped working completely). The big Dyson is challenging to store and (contrary to mos lucky other users) did not follow the thermostat settings, so I brought it home where the esthetic value plays a more important role. Dyson is great, I have the V8 at the AS, and LOVE IT! Hangs right behind the bedroom TV.
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GT 27 2021, F250 2022 Platinum- 2022 Tesla X - 2021 Ford Mustang Mach E - 2022 Tesla 3 - PP3 hitch
GSD Sigrid - Fort Lauderdale, FL; Denver and Summit County, CO.
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