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I know it has been mentioned by others, but unless you have warm weather birds, -8 degrees should not cause any problems. I would suspect frostbite from high humidity in the coop rather than low temperatures.
My first experience with chickens - 100 leghorn cockerels - was in a drafty storage shed. We had temps of -25 degrees (F) with no problems. It wasn't until the temps got down near -30 that I had a few birds with the tips of their combs frostbitten.
Check out the ventilation situation. Hum-m-m-m. I don't know if I've ever seen what level of humidity was safe. I would take out my humidity gauge out to the coop, but aside from the true moisture level I don't know what I'd learn. Guess I'll ask the old timers where the humidity should be.
Love, Linn B (aka Smart Red) Gardening zone 5a - 4b in south-est, central-est Wisconsin