Really interesting to see the evolution of chicken raising! I agree about brooding in cooler temps. We started ours upstairs for a few days while they got their sea legs, then moved them down to our 50 degree basement (with a heat plate of course). They did outstanding! Feathered very quickly, and were able to start enjoying the outdoors by 3 weeks. We'll be attempting chick integration next spring, and I'm going to utilize the advice in this article (do it early, escape portals, etc.)