When I lived in Wyoming, I had a screen enclosure around some raised beds for gardening. I wrapped it in plastic the first winter. It was not sealed tight, the snow would form 2-3" high snow drifts below the seams on top. I had spinach plants that survived the entire winter. They did not grow much, but they were green, healthy and alive all winter. I went out and gave them a little warm water about once a week or so.
Your chickens will be fine as long as you can vent the coop area to let out the hot moist air that the chickens breathe out all night.
Your chickens will be fine as long as you can vent the coop area to let out the hot moist air that the chickens breathe out all night.