My babies are 3 1/2 weeks old. They were staying in the spare bedroom (13 of them) in a rubbermaid container w/ a heat lamp. Needless to say, it was getting VERY cramped. I put them in the coop today in a LARGE cage, with plenty of sawdust, and a heat lamp in the cage about 7-8 inches from the floor. The coop is VERY secure, no chance of stronge draft, and 35 adult chickens sleeping in it. I would think all this combined, they should be ok (going to be about 30 the next couple of nights, 50's during the day) My husband says no way, not a good idea. They seem so much happier, are running around, playing, flapping their wings, and over all seem alot happier. Will they be ok at night.?