Does keeping chicks excessively warm keep them from feathering out quick enough? I want my CX to go out to the chicken tractor at 3 weeks old.
I think cooler temperatures help them feather out a little faster
I think it does as well. For the last several years, I've brooded outdoors, using a heating plate as my only heat source. All my chicks raised in these conditions seem to feather out faster than I recall the chicks doing when I brooded them indoors. I've noticed the same thing with chicks raised in chilly spring weather by broody hens.
I've also found that meat birds, in particular, run a little hot and can withstand much colder temperatures then you would think. I would go up in morning in 35 degree weather and find my 5 day old meaties outside the heat plate and running about the brooder.
The other thing I recommend in brooding -- particular because you have 1 or 2 keeper hens in your brooder -- is to get a dish of dirt or a big clump of sod, taken from your yard/chicken run and put it in the brooder. It's advice I got on this forum, and I found that early exposure to whatever microbes are in your yard makes for a more hardy and resilient chick.