Originally Posted by fsdork
Originally Posted by littlehulkster
Seriously, these solutions are all WAY overcomplicated when there are little electric space heaters that plug into a cigarette lighter and sit on the dash. They're cheap and would work well enough for the few days you'd need one.
Can they draw enough power to make a noticeable difference? Even if you can pull 20 amps through the lighter socket, at 12 volts that's only 240 watts. I can't see that having much of an impact at -40.
You're heating a small, enclosed area, so yeah, they work alright.
If you REALLY want some hot, quick heat, Mr. Heater makes what they call a golf kart heater that runs on a 1lb propane cylinder. Small enough you can use it inside a vehicle, too, in fact I think it even fits in most cup holders. Way more heat than a 12v electric but they run about $100.