Just wanted to share my experience (my 1st) with moving chicks out to the coop. I'm in NY and the temps are down to about 50 degrees at night. I have 4 week old chicks that were brooding in a rubbermaid box in a room off my bedroom. There are 3 chicks - Australorp, Barred Rock and Golden Comet - and they were getting too big for the box. I hadn't been using the heat lamp on them for about a week because I noticed they were moving to the opposite corner. They are almost completely feathered out. I started taking them out for a couple of days, and left them in the coop all day on Sunday. Daytime temps were about 60 degrees. They were fine - no huddling, lots of playing and scratching and running around. After a very messy escape from the brooder box, I decided to try them out in the coop last night. I partitioned them off from my two older hens, put down plenty of bedding and put batteries in my flashlight. I checked on them a few times and they were fine. No piling, just snuggling together. When I went out just before sunup, they were awake and eating and drinking - all spread out with no snuggling or huddling together, so I guess they were warm enough. Yay chicks!!