Here is one I built about 4 years ago . You could insulate it real easy , but the small buddy heater on low is great . There is enough room for two adults easy .
mine has no insulation, and is totally drafty with storm windows turned sideways to make them sliders, a 1/2" gap in the door top for observation, etc.
I've used two of the little buddy's and both cause condensation (water vapor is a natural by product of NG or Propane open flame combustion) then shut off about the time it gets warm.
About 10 minutes later, it will light again, then the windows need wiped with towels to keep the condensation down.
I've found that just the pilot light puts out pretty good heat. Since I'm dressed for cold, I'll just warm my hands on the pilot. Put some soup or chile in a can to warm up for lunch on top of the grill.
I'd like to put in a heater with a vent.
I'd also like to add, that when it gets well below freezing, and the buddy heater is cranking, the water vapor that develops in the blind using the storm windows side ways to become sliders get frozen in place.
My next blind that is built, and waiting to be put up has wood slides around the windows, and safety glass panes that have lots of play in the wood slides, so the freezing up issue won't happen.
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