Cetawin nailed it. You need ventilation in two walls, minimum. Use deep litter and by all means put poop planks up centered beneath all roosts. 24" width best. More easily cleaned if they are covered with linoleum. I use an 8" drywall finishing knife to scrape mine every AM. I open all 4 windows wide too. I never have to touch the litter or nesting. My coop does not stink except a poop smell when I go out in AM. It is gone in 10 minutes every day. I plan to change litter every spring, unless I see mites.
You will have a sick flock if you do not act now. Even so, confinement 24-7 is not good. Chooks need sunlight, even if it is a cloudy day, there is ultraviolet light present and they need it as we do. And breathing that smelly, damp, contaminated air 24-7 cannot be good.
You will have a sick flock if you do not act now. Even so, confinement 24-7 is not good. Chooks need sunlight, even if it is a cloudy day, there is ultraviolet light present and they need it as we do. And breathing that smelly, damp, contaminated air 24-7 cannot be good.