I made a lot of mistakes in my coop before I found BYC too! My worst one was I had a great big window next to the roost on the WINDWARD side of the coop!

It's a wonder my poor chickens even survived until I fixed that! And nearly as bad: that was practically the only source of "ventilation" in the coop, which means NO ventilation, as there was no cross-draft to get air moving - until this past summer when I hired a guy to cut windows on the opposite side, higher up. My coop was an oven before that!

smh