I keep reading here about how important ventilation is in winter but at the same time how bad drafts are...how do you have one without the other? My coop is 4x4, 6' tall, sloping to 5' something. There is the chicken door, human door and two glass windows (about 2'x3' each) that open out and up. Where the top of the wall meets the eaves on the slanting sides there is about a 1" gap that I was planning to cover with trim before winter. The coop is not insulated, I was planning to put plastic over the windows in cold weather. I'm wondering if I should leave that gap at the top open for ventilation? Will that be too much draft or is it high enough above them that it won't be a problem? I have 5 chickens, a small run but they free range most of the day. I am counting on them being hardy Vermont chickens who will at least tolerate the snow (I know this might be wishful thinking). Thanks for any help or suggestions!