If you're just concerned about ventilation how about a "screen" door? My coop is being delivered in 2 weeks (single girl, no handyman in sight!!) and because I'm paranoid about predators I plan on putting a plastic coated wire door on the entry the girls use this way on hot nights they have more ventilation.....
Well my girls are in a converted dog pen, with chicken wire over the chain link, hardware cloth and coregated roofing on the top and electric fence one foot up and three feet up. I refined the hen house a bit, I hinged the front and made a screen of hardware cloth but they don't go in by themselves, is it too late to close them in it, they have been out for over a week, and they just snuggle down in a pile, until I get home (around 9:30) and put them in. It has not rained, and that is one of my worries, they stay under it a lot, and there is roofing over the whole end. They will go up and hang out in it, which is good because that is where I want the eggs to be laid.
I know come winter that door will be shut! but now if we get a pop up storm I hope they have the sense to come in.....
My girls are doing good going in and out, several times a day, in the coop. When the weather is colder I think I'll put some kind of self-serve door, like the plastic strips I mentioned...