I live in michigan and have 6 Buff Orpingtons. It's supposed to get very cold this week. I have a decent store bought coop. They've been walking around in the snow and seem fine, but have been huddling up against the house or under trees. Tonight I've partially covered the coop with a tarp, as tomorrow will be colder & windy. Do you think this is enough to keep them warm? Also, I have 1 chicken that had a minor injury a few days ago. I had to move it from the other birds until it heals. It's in a dog kennel inside my garage with a blanket floor. I turn the heat lamp on it for only a couple hours in the evening (I don't like leaving it on at night & while I'm at work for fear of fire). Do you think this is enough to keep this one warm in 5 degree weather? I just worry since it doesn't have the others to snuggle & stay warm.