Hello, I am new to the site. We are planning on redoing our coop this summer and I have a question about ventilation. We have had tons of problems trying to figure out the ventilation vs. draft problem. We live in a cold climate with a lot of wind. We originally had ventilation at the top of the coop but quickly found out that the wind blows a lot of snow into the coop, so we filled the holes. I guess my biggest question is how important is ventilation and is it harmful for the chickens to not have ventilation during the winter months (Can I cover the vents so snow cannot blow in). I wanted to get this figured out as much as possible since we are redoing and expanding our coop this summer. Any help would be appreciated. Thank you all.