I have a question about cold weather management. I live in southern Washington County, New York, about 40 miles northeast of Albany. It's often in the 20s (F) in the winter and there are some nights that dip below zero. I've had four chickens in an 8-foot by four-foot coop for several years. I divided the space in half with poultry netting, so they are actually in 4 by 4 feet but there's nothing blocking off the other half but the netting. After a couple of unfortunate events this summer, I ended with four chickens but two half to be separated from the others. I now keep two in one side of the 8X4 coop and two in the other. I'm concerned that there aren't enough birds to keep themselves warm in the cold nights. I use an incandescent light bulb to add heat but don't want to use a heat lamp because of worries about fire. Will the fact that they are now spread over the entire space mean that they are colder? They can roost next to each other (with the poultry netting in the middle). I could get some more birds, but they'd come from the auction house and I wouldn't be able to quarantine them. One of the chickens is a rooster I inherited this summer who has never had access to a coop (he's spent his entire life outdoors, roosting in trees). Does anyone have any thoughts? Many thanks!