I live in the city of Minneapolis and it gets quite chilli in the winter and quite hot in the summer. I'm wondering what other Minnesotans, North Dakotans, Iowans do to keep their chickens warm in the winter. I will have three hens. I understand that putting light in the henhouse makes sense, however, what material do you use to keep the henhouse insulated? If you have a tractor I would really like to know how you insulate and sending pictures would be great too.