I have 25 3 week old CX. I gave them free choice for the first two weeks. Then I switched to a 12 hour on/off schedule. The birds are all healthy and pretty active. I put them outside during the afternoons when I get home from work and they are content to practice flying and foraging in the yard. They don't seem as sensitive to cooler temps as my layers did. I would like to move them out of the garage soon but with overnight temps projected in the 30's this week I will stick with what I am doing now. If it was warmer I would not hesitate to move them out in a lean to with some heat for cool night temps.