My coop has a door in front, window in back, coop door for hens, and 2 feet of wire under the roosts covering the back portion of the floor....I can put plexiglass in the door, close the window and coop door.... but when do I need to cover the wire under the roosts.....or does it get cold enough to do that. There would be no ventilation if I do and I worry about that. All my hens are considered cold hardy but due to pecking order they do not cuddle close on the roosts, there is always one sleeping in one of the nesting boxes and one sleeping on the floor on the wire.