My coop is 4'x7' but the walls are only 22" tall, and slightly taller at the peak. I cannot for the life of me figure out how to have good ventilation without getting a draft. The problem as I see it is that the vents are not positioned above the height of the chickens so a draft is inevitable. I could leave one end of the coop open and they could stay in the other end, but would this be enough to elimate drafts. Fortunately I only have five chickens and the winters here are too bad. Which brings me to another question, at what temperature does a "breeze" become a "draft"? My chicks are all cold hardy.