First off, you should check out the Montana Owner's Club (MOC) forum - there are several people who've added electric heaters, trouble lights and other things to the basement.
Don't quite understand if you're asking about the wall between the front of the basement and the front most storage compartment, or the wall between the rear of the basement and the hidden basement. The front and rear walls are made of that chipwood they used for most things, but the front one also has a metal sheet you can see inside the front most storage compartment. That compartment was never meant to be heated since it's where they put the propane generator if installed. If you don't have one, there's still odd slots and other openings that make it ventilated.
The rear wall should have a heating vent on it from the hidden basement area. Most Montanas have one of the furnace plenum duct openings left open to this area and that vent on the wall allows some of the escaping heat into the basement we use. Not the greatest solution to keeping water lines & tanks heated, but it does the job (with little care to our propane dollars!).
What we've found works to keep the living areas warm but not allow water lines & etc. to freeze down to about 15 degrees is the following: Have the fireplace and a ceramic electric heater running in the living room at about half output (or more), and the furnace thermostat set for 64. Most of the heat from the living room goes into the bedroom and the furnace runs only enough to keep the underbelly above freezing. The supposed 'polar' insulation is quite pathetic and there's a lot of heat loss, especially if you don't get pillow plugs for ALL the vents.
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'06 F350 Lariat turbo diesel dually, Curt 20k, Softopper, Aerosheld, coolant filter, air bags
'10 3665RE Hickory, wet bolts, Trimetric battery monitor, 4 100w panels & Morningstar TS-45, still tweeking!
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