I'm new to chickens. I've looked but couldn't find a temperature range/chart for the inside of the chicken coop. Should the coop stay at a particular degree or should the chickens just stay inside during cold weather? I noticed the temps went from 84F to 65F during the night. I had closed up all up a few of the windows before I went to bed. Should I leave the windows open to allow for venting of air or keep closing them down to keep the chicks warm as they are only 4 weeks old right now. Thanks!