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Explanation:
A furnace burns propane to make heat. (Make a flame, feel the heat.)
A heat pump is basically your air conditioner (AC) running in reverse. When on AC, a compressor acts to "pump" heat from inside your coach to the outside. When operating as a heat pump, it changes the direction and "pumps" heat from the outside to the inside of the coach. Of course, it works best when there's a lot of "heat" outside. That's why AbdRahim said that they only work down to about 40 degrees outside. Below that there's not enough "heat" for them to operate properly for large spaces like a coach, TT, or house.
How can there be "heat" at 40 degrees? you might ask. Well, if you have a deep freeze type freezer at home, it's basically pumping "heat" from the inside of the freezer at 0 degrees to the outside of the freezer at, say, 70 degrees. Not easy and takes a relatively large amount of power to do it. Your fridge does the same thing, pumping heat from 37 degrees or so inside to 70 degrees or more outside.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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