here is a pic of my coop, the box part is 1/2 nest box 1/2 perch, pretty small box1/2 of fenced area is covered with tar paper they also go under the box, especially when it is hot. dh thinks light should be in nesting box, I think under box or under tar paper. what does someone with experience think ? I have 3 chickens 1 rrr and2 black hens. thankyou for your help, I am in zone 7 and may get 1 or two freezing nights but no more than that.
We do not put a light in our chickens' coop and we live in a place where is gets dark early and gets freezing in the winter. They still lay eggs, albeit fewer. If you want to have a light, somewhere where the girls will spend the most of their time is a good idea. Maybe you could set it up on a timer, so that they still get 8 hours of darkness a night, so they can sleep well.
I use lights in our birdhouse in the winter months. Hens usually need about 16 hours of light to continue to lay well. Of course there are breeds who are daylight hours neutral. I don't know about the breeds you have. Especially the unknowns.