I live near the Michigan line, and our chooks do fine with no insulation in their coop. All we do is make sure there is plenty of straw for the nests, lots of pine shavings on the floor, and we put up plastic panels wherever there is hardware cloth in the run to break the wind and keep out the snow. We do have a heated waterer inside the coop, so that probably adds a wee bit of heat, but we have ventilation vents right above the waterer to make sure that there is no moisture buildup. The roosts are 2x4 flat side up so they can keep their toes covered with their feathers when they roost.I live in Wisconsin, are you sure i sondo need insulation?