Mudfrog is correct. Heat pumps are worthless when temps are that low. Mine doesn't do much if temps are below about 45 or so. Also, most RV heat pump installations that I've seen only drop air down through the ceiling vents, and are not pushing any heated air into your basement compartments where the plumbing is. Many RV's (not all) have heated water bays as standard or an option, but to the best of my knowledge, that's only from the RV's primary furnace (for example, propane furnace).
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2013 Fleetwood Discovery 40G, Cummins ISL,Freightliner Chassis, Allison 3000.
2009 Jeep Wrangler Unlimited Toad w/ Blue Ox Aventa tow bar and M&G Braking System
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