I have never had heat in any coop.
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Same, I have an open air coop and when I went out to check on things one of the coldest days of the year they were as happy as clams. Granted it didn't get below the teens but judging by their behavior they weren't even slightly cold (they were standing comfortably, not puffed up not huddled on the roost). Like owner like birds IG though 'cause I also love the cold, I was happy as a clam too and was checking on them in a t shirt and shorts (yes, there was snow on the ground) and I was possibly barefootI have never had heat in any coop.