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They will decide. Fresh air is good for them. They might only dash out for 5 minutes... but that is still a good thing. I do worry about enough ventilation in your coop if the open pop door drops the temperature. Ventilation is critical.

-29C would be the coldest I would want the coop at. -17C to -12C would be what I would aim at. That is cold enough that there wouldn't be shock if the heat goes out. As soon as you provide heat, you want to make sure you have a "what happens if everything busts or we lose power" plan or...