We got our chicks at the feed store, and have had them for 3 weeks, so I'm assuming they are about 4 now. We have 15 of them in a small brooder (about 6 square feet) so they have obviously outgrown it. We let them out in a pack&play in the living room for a few hours a day, and they don't seem stressed or anything, but I know I need to get them into a bigger home. I am working on their coop, but it is a bit by bit process as I am building it from recovered/recycled materials from an old dilapidated house on our property, and I am limited on available time to work on it. My question is, once I get it built (hopefully within the next week 2 at the most), can I safely move them outside, or do I need to find a larger home indoors for them? I live in the south, and the cold weather should be over for now, but it is still in the 60's at night occasionally. Could I keep them in the coop with the lamp on out there, or would that not be enough? I haven't had chickens since I was about 8, so I remember very little about it.