zinia, thanks for the link - it was a really really good article.Here is a link on venting your coop to give you an idea. I live in the dang blasted frozen mountains of Pa. I have windows on all four sides of my coop. I open and close them according to which way the wind is howling from.
https://www.backyardchickens.com/a/...-go-out-there-and-cut-more-holes-in-your-coop