I think it really depends on how many you have, and where you are. I used the lamp to heat up a wall of the brooder from the outside for the first 3 weeks, and as time progressed, they used that wall less and less. After 3 weeks my 8 birds seemed to not need it anymore, which was when I removed the lamp. Nights were mostly around 75, with the lowest being 69 (iirc), they seemed to keep each other warm well enough. I think brooder size will affect heat retention too. I‘d say watch your birds’ behavior and proceed to make little adjustments from there.
Im a first time owner though, so you should probably take my experience with a grain of salt.
Im a first time owner though, so you should probably take my experience with a grain of salt.
Mine do amazingly well in our Wyoming springtime temperatures….20s, occasionally dropping into the teens. I’m perfectly comfortable raising them outdoors with Mama Heating Pad, letting them decide for themselves when they need a quick warm-up. My brooder is just a wire enclosure, on the ground, in the covered run. They still follow the pattern of needing less and less heat by 3 weeks and being off all heat by 4 weeks. At the end of that 4th week we remove the brooder pen completely.
If I couldn’t do do that, I’d never raise another chick.