I will add to my previous post that I saw our 2005 Copper Canyon as a three season rig, we did spend the month of January on the Oregon Coast. During our stay temps got down into the very low 20's.
I had installed the cheap heat system from RV Comfort Systems, and we never needed to switch back to propane during our stay.
The reason I state that is the Cheap Heat only puts out 17,060 BTU at a 5,000 Watt setting, our propane furnace is rated at 30,000 BTU input, but 23,400 BTU output so we had 6,000 less BTU of heating power. We set t-stat at 68 degree day, and 65 night, it always kept at the set temp, and didn't run continuously.
PS: the underside of the 5er isn't sealed yet, but does have Ultraheat pads on all tanks.
