We built the coop when they were babies and we made high vents on each of the tall sides (excuse my lack of building terminology). Now they have taken a liking to roosting up in the eaves and I'm thinking these two vents are too drafty for them (two of my leghorns got frostbit on the tips of their ridiculously floppy combs). Should I put a board over these vents with a bit of space so that the cold air is not coming straight in but has to go up or down before entering the coop? Does anyone get what I'm trying to explain? Any other ideas of how to handle this?