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I would open it an inch or so, that will help, but from everything I have read on here, you need air in, air out. My coop is not tight. You can see day light through some cracks on all four sides and in the ceiling. If you have some cracks, you should be fine- otherwise I would work on...
I live in Iowa. It is cold. My chickens have one heat lamp suspended from the ceiling, also and that is mostly to keep the water from freezing. They do well in cold weather and make sure their coop is ventilated very well. You are doing great! I wanted to bring my chickens in the house when it...