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This winter I am going to try sleeping outside in a calf hut (pic related, I have the same model) to get a feel for sleeping in the cold. If all goes well, then I will probably move a second one out to my innawoods spot so I never have to pack a tent again. Right now I have a 48" barn fan blowing on me to help get me used to the cold, but it's still in the mid 40's.