in Minnesota I have our girls in their run and their coop is for sleeping and egg laying. Our run is wrapped in clear plastic on 3 sides to allow sun in and protect from wind and snow. The top is a metal top. That is the only insulation I use. The girls have thrived. Our winters can get down to -25 so if it gets -10 I will turn on the heat lamp and feed them more cracked corn (to raise their body heat) but they are doing great!
