Alternative methods of heating
We took the coward's way out this winter and just flew to Guatemala and Honduras for three months.
We got back to our rig last night at our son's place in the mountains outside of Las Vegas, NM (7600') and we did have to use the forced air heater since it dropped to high 30's. We used to set it to 40 at night but Elaine says we now set it for 55 at night. We do use an Olympian Wave 8 as ancillary heating. We have not plumbed the propane lines for an interior hookup for the Olympian Wave (catalytic heater) since we were unable to get a plumber to do this in the fall (they were all booked) and so just took a 20# propane canister into the trailer. It sits right next to the propane alarm when in use and we do test the alarm.
Have posted elsewhere that we are solar autonomous, aka we have not had to hook up to shore power or generator since the current system was installed in June: 1400 W of solar, 9.8 kW of lithium iron phosphate batteries and 4 kW PSW inverter. This gives us 8 kW of usable 12 V = 650 amp-hours at 12 V. We would need 1300 amp hours at 12 V of lead sulphide batteries to get the same amount of energy storage (10 to 12 large batteries). The result is that we do not have to worry about batteries running down overnight. We were in a snowstorm in November with 8" of snow on the roof and we ran the heater for three days and still had more than 60% battery storage, i.e. good for another three days since the lithium batteries can drop to 10% capacity with no problems in cycling.