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I haven't yet used the furnace while driving in the past 1 1/2 years. I figure the movement keeps the water from freezing in the tanks and there's enough warmth retained inside from the time the furnace was on to protect the pipes. Also, during the day, there's enough sun on the trailer, even on cloudy days, to warm it up. If it were down in the teens, then I would consider turning on the furnace. The lowest setting in our trailer is 40˚.
Gene
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