Hi guys, I use a tool shed for a coop. It has one window and a big door. I cut their door in the big door. Anyhow... right now I leave the window open and I usually prop the big door open during the day for ventilation. But this winter I will close the window and cover it will plastic and keep the big door shut because it will be very cold. I am wondering if it will get too stuffy and stinky in there for them? I usually clean out all their bedding but this winter will probably deep litter. Will that make it more stuffy and stinky? I would hate to have to cut a vent into the wall/roof for a vent, but I might have to?