You could use plywood or clear roofing panels to solid up the north and half of the east wall if you are feeling drafts. I think I would do it anyways. I'd use the roof panels if you have the money to allow more light in. It would give your birds a place where drafts would be minimal. That's what I would do.The first photo has directionals marked in. It's kind of messy, ha. The coop is built into the southeast corner of the barn, so north is at the opposite short end where the other roll-up door is, and west is the opposite long end of the barn that is actually the wall of the back of our garage. The two windows in the coop and the Dutch door face east. Given our prevailing winds are from the northwest, the coop is naturally well-placed. At least we have that going for us.