I live in Michigan and we get some very cold weather, I recall a winter a few years back in which thge temperature stayed below 0 for 9 days. I built a fairly nice coop and all has gone well to this point. I have plenty of windows which provided execellent ventilation in the warm weather. This week I installed some old removable single pane storm windows that were laying around after a recent renovation. With the reduced ventilation, I decided to cut in two vents. I have a standard floor vent placed high in the gable on one end of the coop, and a larger 6 x 14 inch vent in the opposite end. Everyone seems to recommend lots of ventilation, and this seems to work, but it will certainly create a draft. I have read that drafts are to be avoided. This seems like an oxymoron. How can I get good ventilation without some draft?