efficiency of the heater/furnace
I haven't had this experience with the camper I am using now (the 2009 H/R may have a different type furnace than the 20006 Jayco but I doubt it) but last year it was cold outside and I was at a camps...
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It's really more about the space- to be efficient you need to extract more heat, which takes a *much* larger heat exchanger.
