When we bought our farm, it came with this really neat, old coop. I've been here 11 years and finally bought some chickens this Spring. So this is my first winter, and I'm not sure I've got the ventilation right. I'm looking for opinions from anyone who knows more about this than I do. We've already gotten well below 0, and my rooster got frostbite. This is the only picture I have here at work of my coop, but it may be enough to set the scene for you. The front of the coop faces south. As you can see, it's quite open. We have a big low window on each side, a smaller window on each side above the large window, two large swing-out doors in the middle, and then a large rectangle vent window centered above the two doors that isn't visible in this picture. All of these doors and windows are open and covered with hardware cloth. My 9 chickens roost in the front, just inside the left door. So for winter, I have covered the windows on the left side of the coop as well as both the doors. Their roosting corner is therefore draft free. I've left the windows on the right side uncovered, and the vent window above the two covered doors is also uncovered. The only openings I have are on this front, south-facing wall. The east and west walls are wood with tin siding that swing up and can be staked open like wings for warm-weather cross breezes. The north wall is solid wood with tin siding, but it does have a couple of small ventilation notches up by the roof. The whole coop sits up about a foot off the ground and on skids. I assume they moved it around the farm back in the day. It has a wire floor that I have completely covered with deep straw. I've also lined haybales along the outside west and north walls to prevent wind and snow from blowing up under that raised floor. When you stand inside on a very windy day, it doesn't feel drafty at all. I know it'd be ideal to have vents in all walls, but what do you think based on what I have to work with, as is? Is it enough ventilation? I've noticed some frost on the inside roof, which is also tin. So I'm thinking I need more ventilation. But I don't want to mess with the left side where they roost.