Cold weather camping

We use our 29 Chateau Class C all the time in AK to go snowmobiling. Make some window coverings out of that foil/bubble insulation. Comes in 2' or 4' wide rolls at Lowes. Cut em to fit the inside window frame and poke em in there. Store em flat under your beds when not using. Get some 2" blue rigid foam. Use a serrated knife to cut em to shape to fit tight up in your ceiling vents (take the crank handle off and store it). Unscrew the ceiling return vent for your A/C and stick a piece of the foil stuff up there, reinstall to keep it there. Or you can buy some aftermarket bubble foil covers that velcro on the inside but the blue is way better. If you are hooked up to AC run a 1500 watt heater and your coach heater. If not....run the******out of your coach heater and be prepared to get up in the middle of the night to run the genset for an hour or so to keep the batteries up. don't let em get below like 85% or you'll wind up killing em. Water is drained. We use the toilet and flush with RV antifreeze. Toss the dishpan water outside. Better run your coach heater to keep your pipes OK if you've got water in the system.