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We have an 80% efficient furnace in our house and the exhaust going out the roof is also hot...that's just the way furnaces work. Newer furnaces for home can be much more efficient now, though, and really reduces the heat loss. I don't know what it would take for the RV market to develop that kind of efficiency in their furnaces...or what it would cost.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana HC 305RL / HW Progressive EMS
2015 RAM 3500 Laramie Longhorn Crew Cab 4x4 DRW / Demco Recon Hitch on RAM Puck Ball
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