I had heat but I wasn't about to leave it run all night. A few nights I went and slept on a friends couch when it was 20 below zero
I didn't let it run all night. I just started it up once in a while, long enough to get some heat out of it. In the Omni, I just wrapped myself in blankets.
It's also easier to start the car for a while when you're already in the driver's seat and not laying down in the back of a van.
Yeah. I found that if I covered myself from head to toe, especially my head, then the sleeping bag or blanket I had would contain the heat escaping my body through my breath and that would keep me plenty warm most nights
Your head and feet are where you lose the most heat - followed by your hands, but we usually have at least our feet covered and, in this case, hopefully wore a hat. So, that'd leave your hands to get cold and radiate heat away from your body.
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