I live in southwestern Indiana, which can experience all types of winter weather. I need to know if my coop set up needs improving. My shed is 8' x 10' with half for chickens. It is insulated in the walls only.I can run electric out to the coop, so I am as worried about heating or keeping the water thawed. The windows are roost high (the chickens can see out the windows). Will this cause drafts? Two windows (with 12" x 18 " openings) are on the east and west side for ventilation and the pop door faces north. I cannot put any vents in the roof or the upper walls they are covered by a vinyl tarp until the roof can be replaced next spring. I could put vents in the roof overhang if I really had to. The ventilation was fine this summer because two fans were running in the coop. Indiana has extreme humidity which makes the heat worse.