I always brood my biddies in the coop from day one. Here's mine at a few days old. I took there heat away at around three weeks. Now, there four weeks & I'm removing the cage in the coop. I will put a few on the roost every evening till they figure out thats their new place to sleep. Guess, everyone has there own way of doing things. But I do have 39 iddies so they can snuggle if they get cold.
I think this is what I want to do with the next batch that I get 7L. I have a very large empty coop and am already planning my next chicks. I just think since we have all this space it would be nice to use it. I also want the birds to be friendly, but sufficient on their own. I've been trying to follow the majority of the recommendations here but my husband (who grew up with chickens in Mexico) thinks I am crazy keeping them in a box in the house when they should be outside. I sort of wish I would have gotten a mama to teach them the ropes.