I have a 4x4 wooden doghouse/coop...I converted it this past summer. I cut out windows on 3 sides with a 1x2 open front to the run. This is a very sturdy house, but the windows i cut too big, I think. They only have galvanized steel on them and the coop is very airy. This was great for our 90+ heat this past summer. I am worried about this winter. I have read and been told to use the foam insullation from home depot. I am thinking about buying enough tomorrow to insullate up the windows and covering all but about 3 inches of each one. I am going to insullate ALL the walls. Is this a good idea? I went a little over board with ventalation.