I live in Michigan also (about 90 minutes north from Muskegon,) and after last winter, I'm ready to bring my chickens in for the winter! My coop is 8'x10' with a 9' pitch. It's 3' off the ground and has East (2 1'x2') and West (2 2'x4') ventilation grates. There are North and South entry doors that go out to a 30'x30' run We have eight 12"x12"x12" nest boxes, two 18"x18"x18" (we made them for the Light Brahmas because some are too big for the 12x12s; now the 18x18s look stupidly huge, but they are the only boxes everyone lays in now) boxes, two 10'-12' 2"x4" roosts (2" side up for roosting) 2' and 5' above the floor and 19 chickens: three EE roosters, seven EE hens, five Light Brahmas, two Production Reds, one Silver-Laced Wyandotte and one Black Star. We may only take 12 or 14 through the winter. Right now, the coop is bare floor (scraped down every week) and the boxes have shavings in them, also cleaned out every week. Some chickens sleep in the nest boxes and those get cleaned daily. Others sleep on top of the nest boxes, and that gets scraped every day. Should I put something up there so they're not sleeping on their own poop
The coop is wired with electricity and has two outlets and a floodlight (can't scoop poop if you can't see poop.) I was considering some heat, around 40 degrees, just to keep it above freezing, and for peace of mind. The coop is double-walled, and the few obvious draft threats are getting closed. I'm hearing a lot about straw and shavings on the coop floor helping, and that infrared heat lamps aren't such a good idea. I understand the humidity and cold issue, and I'm pretty sure I have adequate ventilation. I notice the floor always looks 'damp,' and 'dampness' around the trusses where the eaves start. It does seem more humid in there than outside. The coop hasn't smelled like 'chickens' yet.
So, is my coop size adequate? If not, what would be good changes going into the winter? What about heat? If I don't heat, will the water freeze? The coldest winds here come from the North, and I was planning on blocking off that North entrance. Yes or no? I am concerned about humidity, and have used a product called 'Sweet PDZ' under sawdust in dirt-bottom, matted and cement floored horse stalls that really absorbed the moisture. I can see the chickens eating it, tho. The floor is particleboard, should I put a sealant on it? Obviously, this is my first winter with chickens, so I need some help. I want my kids to be comfortable, and I know they have been surviving outside for a very long time. I just don't want to go overboard or underboard. So anyone with experience in my temperature/weather zone, your knowledge would be greatly appreciated.
Julia