You can double pane, triple pane, quadruple pane the windows in the coach area, but you STILL have a single pane windshield and side windows in the cab. Which IS where ALL of the cold comes in. So imho its a moot point. :W
My advertised "heated" tanks on my first Class C turned out to be nothing more than they split my heat vent in the bedroom and sent half of the bedroom heat to my sewerage bay.
I found out that little tidbit when winter came and the bedroom was freezing cold with the furnace on high.....cause half the heat was going to warm my tanks.
Whatever you decide to buy when they say heated underbelly, heated tanks, heated anything?
Get on your hands and knees and LOOK at what they are calling heated and how. :C
