You need the ventilation all year long. I live in SW Indiana and have that same kind of rural light in my yard. My coop sits so the two smaller windows face the light and the much bigger window is on the opposite side facing the rising sun. The coop is big enough so that is is very dark inside at night and there is absolutely no problem with the yard light coming on at dusk.
The chickens start gathering around the coop as the light is coming on, before full darkness they have all gone in the house and roosted for the night. Maybe they are like city kids and know you gotta be home when the street light comes on
The chickens start gathering around the coop as the light is coming on, before full darkness they have all gone in the house and roosted for the night. Maybe they are like city kids and know you gotta be home when the street light comes on