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I always try to imagine how the chick would be doing if it were raised by a broody hen vs a brooder.
At 4 weeks, your chicks would not be under momma hen during the day hardly at all. They'd be out and about, doing their little chick things, even down to low temps. At night, they'd be sleeping under momma, but it might be a tight fit!
If you're needing more space, I'd go ahead and move them out, with a heat lamp at night. I firmly believe exposure to the cold encourages them to feather out faster and keeping an artificially warm brooder temp all the time leads to 6 week old chicks that aren't feathered out. I've noticied my broody hen raised babies feather out much faster than my brooder babies. So, move them out, they'll be fine with the daytime temps. Have the heat lamp during the night, give them a warm spot to sleep, and turn it off during the day. They should be fine.