My coop is a hoop coop and the cover is an old billboard. The door window is open 6 inches all winter (more when the temps rise) and it has several roof vents. Other than their deep litter that's in there and some hay thrown in on the coldest days (-15 temp -40 wind chill) to let them nest in if they wanted, they had nothing else. They all survived just fine, I averaged at least 1 egg a day (I do not add light to increase/continue laying thru the winter) The south side is covered with clear heavy duty plastic to allow whatever sun there was in through the winter. At times the snow was 3/4 of the way up the sides of the coop (we got 7 ft of snow in 3 days in November) but the snow acted as an insulator.
I also feed/water them outside the coop in a little lean to attached to the coop. They have to come out to eat/drink. I found in the past the food & water added to much moisture to the coop in the winter.
The temps in the coop are maybe a degree or 2 warmer than outside. But it effectively blocks the bitter winds.
I just wanted to let you know that you can have large comb breeds through our rough, bitter cold winters & not have a problem with frost bite.
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How did you make the roof vents? I have a hoop coop and could really use roof vents to help deal with heat buildup in the summer. Not sure how to put them in and still keep the tarp from shredding in our violent summer storms.