Ok I have a 4x4 coop with 3 1x1 external nest boxes. The coop ideally is portable but we want to insulate since we live in maine. We wanted to use styrofoam insulation on the inside but my husband does not want to cover it with more plywood since it will make the coop even heavier to move. I have silkies. Will that be a problem leaving it exposed and what are my alternatives? How did you insulate your coop?