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We live in Australia wheatbelt so winters rarely hit anything under 1 or 2 degrees over night and summer average about 35 degrees. I wad thinking the wall vents and maybe a whirly bird on the roof wpuld suffice currently the chickens roost outside there current coup even when raining only 2 or 3 out of 20 go inside.Hello and welcome to BYC!
Getting adequate ventilation in there would be my primary concern. I would also want more windows for better light. If you have very cold winters and don't have adequate ventilation, the moisture from the birds respiration can condense on the ceiling and drip back down on the birds and cause frostbite.
They are probably roosting outside because there isn't enough room for them in your small coop. I would still try to get as much ventilation in there as you possibly can. Installing top hinged windows that could be left open year-round would be immensely useful. And the whirly gig on the roof is another excellent idea.
They did all start inside the coop then I installed some high outside roosts and they never went back haha. I'll definitely install some hinged windows that's great idea where I can shut them at night when cooler cheers
I live in New York and we get cold winters. I don't close the windows around the roosts until we get nights below 40F (4.4C).
