Catalytic heaters can help you stay warm in cold weather and work much more efficiently than a regular RV furnace. Dealers won’t install them, but have someone do it who knows what they are doing. If you do a wall mount, follow the instructions for how far to place it from other objects. And, always keep a window slightly cracked and make sure your carbon monoxide detector works. We loved ours.
Camco’s Olympian Wave Heaters are perfect for winter boondocking.