I tried a Mr. Buddy for awhile and got really spooked by the potential for carbon monoxide poisoning. Ended up cracking a window and while it didn't get "humid" inside, the cold air coming in negated the heater. Don't do much winter camping but decided that a down sleeping bag gets us through the night and heating coffee water in the AM takes the chill off. We purchased a very inexpensive electric heater and when the temps get below freezing, we head to a plug in. Not a suitable solution for boondockers, but works for us and we sleep a whole lot better.
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