That’s great to know. This isn’t THE source I used but it’s basically what I have followed but hearing what you do sounds much more naturalThey have a brooder plate and they do go under it to get warm from time to time (and they're still sleeping under it), but after the first few days I've never caught them all under it at the same time when it was daylight.
I used dual heat with a Big Red Bulb and the plate for most of the first week because we're having a late and unusually cold spring.
View attachment 3082841
For the first 2 weeks I divide my huge brooder so that they don't get lost too far from their food and water.
As long as they have a place where it's warm enough and know to go there when they need to they don't have to have the entire brooder heated. In fact, it helps them acclimate and grow feathers rapidly.
I will say, however, that my usually issue with chicks is keeping them cool enough. I've already had 85F afternoons.