When hooked up to shore power I use a small electric heater that I bought at Home Depot for $30.00. It does the job. When I first get up in the morning I usually use the furnace to heat the inside up and the electric heater maintains it. It is much cheaper than using the furnace with the propane. My mh is 27 foot with 2 slides (2018 Thor Siesta). Depending on the size of your mh, you might need 2 electric heaters.
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