Actually, they can. Mine do. I've been raising chickens for over 25 years and they are in the coop within the first week or so. (The only reason it takes that long is because I like seeing the little fuzzballs running around the box or whatever I put them in for the first couple of days) I live in MN, and last year I had chicks in the coop the first couple of days in April. They had two heat lamps - one a little lower than the other - and plenty of room to come and go under the lamps as they pleased. As I stated before, you don't need thermometers, you just need to keep it draft-free for them, and watch them. If they're crowding under the lamps, lower them a little. If they're trying to get away from the lamps, raise them a little. Your chicks are content if they're scattered around the area, eating and drinking and making quiet chirping noises. If they're peeping loudly, they're not happy about something. You also don't NEED a red lamp. I've never used one, never had pecking problems. (Maybe because they have plenty of room to move around - overcrowding can cause pecking) Here is a picture of my newly hatched chicks last year in their "brooder". You can kind of see it to the right. It's just plastic garden edging - maybe 4" tall, I don't quite remember
- in an oval shape so they can't pile into corners and squash whoever ends up on the bottom.
Your chicks are in a coop being used as a brooder. They may be in the coop - but they are still being brooded.
Red lamps may not be needed with all breeds; but some breeds/strains are cannibalistic even when given very large areas. I had production Leghorns years ago, and they had real cannibalism issues compared to the dual purpose birds I've kept.
The reason I suggest red lamps is that when people brood for the first time it is a good idea to give suggestions that will make the project as simple and successful as possible. Even when you've been doing it for years, it doesn't hurt to weigh the odds as heavily in favor of success as possible.