THIS, friends is why it's important to have a coop that is big enough. Chickens in northern territories, IMO require even more than the recommended minimum of 4 s.f. in the coop per bird b/c there may be days on end that are BELOW zero. The tighter the spacing in a small coop results in higher humidity from their respiration and poo. That moisture must either be vented out of the coop, or it stays in the coop and condenses, causing huge issues with frost bite. Every winter there are posts by folks who's birds are loosing combs and toes due to frost bite caused by poor coop management, tight spacing, poor ventilation. My pop door is open every day. They have a covered "sun room" with green house tarp and poly on 3 sides of a section of run. But in those sub zero days, they WILL NOT GO OUT.
That's why I'm adding the compost coop, even though the big coop will definitely have more than the 4sf per bird. I plan on between 40 and 50 birds and the 16x24 is roughly double the space, even with that many.