My chicks are about 5-6 weeks old and haven't had a heat lamp for about a week. They never really liked the heat lamp. I kept lowering the temperature and they never slept under it. They always preferred to snuggle. Anyway, I introduced them to the outdoors a few days ago and now they absolutely hate going back inside. I completed their coop/run today and they LOVE it. I'm now wondering if it is ok to leave them outside all night. I've had chicks before that didn't go out this early, but these new ones seem to have all their feathers already. Temps get down to around 45-50 F. They have an area out of the wind with wood shavings in it. Any advice is appreciated! Thanks!