I get the chicks I'm brooding outside ASAP. They are in a safe container / cage near my bedroom window so I can hear if anything comes around @ night. Covered @ night, shade during the day, plenty of air and fresh, cold water, & food.
On hot days I'm tempted to bring them inside the laundry room but I have to remember; chicks who die when it gets hot are probably inferior birds to begin with.
If I coddle them as youngsters, they tend to be poor layers, don't thrive and grow like the others, and die young anyway. It's better not to waste feed and time on a bird who is not meant to survive.
In the past I've taken chicks the hens abandon. Most of my Silkies have been such good brooders, I have learned that anything they reject is not a good specimen.