How many of you living in harsh winter conditions have insulated coops? I have seen some coops here in northern Wisconsin that are not insulated, but we can have long periods of -20 to -30F and shorter periods of even colder. I am just building my coop and think it is necessary to insulate it. While I am at it, which is better the styrofoam or the regular rolled insulation? It will be my first winter with chickens and I am not looking forward to it. The chickens probably aren't, either!!