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You did them a wonderful favor. Here's why. You allowed Nature to prepare them, which is the kindest thing you can do. Nature uses these cold November nights to prepare their down and feather layer for the winter which is coming. Good for you.
Remember also that at the first cold snap, it rarely gets to within 10 degrees inside the coop as outside, especially if the coop is on the ground. The ground isn't nearly as cold as the air is, yet. That takes time. Further, the birds expel heat, the poop generates heat as well. Typically...