Lots of help in getting a good background on your furnace and other parts of your rv here. Use the search engine above.
Your furnace is a propane furnace like a house furnace. It uses the 12 volts from your battery to power the fan. Some also have an electric pilot light but most smaller ones don't. So you need a battery big enough to run that fan which sucks up several amps an hour if you are in cold weather and use it a lot. If you are at a site with electricity the power would be supplied by the 110 volt to 12 volt converter. But then you could use an electric heater anyway and save the expensive LP gas and noise of the furnace running.
Last, if you are staying several nights then even more battery power would be needed, a generator to recharge them and or solar panels to recharge your battery(s).
Think over how you plan to camp, time of year, need for heat, etc. then research how much in battery power and the option or a generator or solar to recharge them if needed.
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2017 SLX 195RB
2021 Jeep Grand Cherokee Summit L 5.7L V8
Andersen WDH hitch, Renogy 100 AH Lithium &
200 Watts solar panels from Renogy
Prev. '14 Jeep Grand Cherokee Overland, gas 3.6 V6
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