I'm in Illinois. We get some nasty winter weather. I try to block the wind for chickens and give them somewhere safe to rest at night, but I am anti-heating the coop. To be honest we haven't even added a light source in the coop so there is not even heat coming from a bulb. The coop is relatively small, 4x8x4ft for 7 chickens. One 4x4ft wall is made of construction mesh. It faces north and there's a fence just 5ft in front of it, so there's little wind that comes through there. Wind here tends to come from the west or south, occasionally the east if the jet stream pushes up further north, but rarely does wind come from the north. My hens all roost about 2ft of the floor and they do just fine through the night so far. I may put plastic over the construction mesh wall in January/February if the weather gets to nasty, but I feel that keeping them out of the wind and dry is the most important.