>>2507246Propane heater, either a Mr Heater radiant cabinet heater (what I use living in Canada) or a little Martin one. Use a CO alarm with USB rechargeable 9v batteries (separate) and don't run it while you're asleep. Heats a small space plenty even with a window cracked.
Get a good sleeping bag rated for lower than the lowest possible temps in your area and make sure you layer up on blankets & clothes, night cap and all. And keep your calorie intake up on colder nights.
Also, if you can, insulate your sleeping/living area. Even if it's just a mylar blanket attached to the ceiling and some plastic over the windows, it's better than losing *all* of your heat every day.
