Chickens require a well sheltered area to roost. This area should be out of any drafts that cause feathers to be ruffled and of course dry! Beyond that ventilation is key to remove any buildup of humidity or ammonia from their waste. (I live in Canada, have average winter temps of 5F and periods at -22F. The entire front is hardware cloth and open year round, no heat, no insulation).
No sure what your reference to incubator and insulation is about. If hatching the incubator is near 100F, their brooder should be at 90-95F for first week, reducing by 5F per week. At 4 weeks they are fully feathered so can be housed with other chickens in a closed off, very well sheltered area. That area should have a door large enough to allow the chicks to venture out but small enough to keep grown chickens out.
Your coop is not secure against predators nor pests. The coop should not have any openings that are larger the 1/2 x 1/2" that are not covered with hardware cloth; I think I see chicken wire, great at keeping the chickens inside absolutely useless to keep many predators out.