Coop ventilation is very important, more is better! Here's a good article on ventilation: http://www.backyardchickens.com/a/c...-go-out-there-and-cut-more-holes-in-your-coop If you need someone to help you figure out where your coop needs more or how to do it, there's a lot of knowledgeable folks on the coop/run forums - you could post photos and ask for ideas https://www.backyardchickens.com/forums/coop-run-design-construction-maintenance.9/
This one is pretty ventilated, the ridge of the roof and where the roof meets the walls are all open. And it’s got 4 big vent holes on the side you can’t see. But it’s only temporary, thankfully. Another week or two and our big coop will be done for them to move into. I definitely think Pebbles, the feisty ameracauna, picks fights to sleep on the doorway ledge. She’s the only one I ever see taking up the whole doorway space. Go figure she’s the smallest of them, too.