Well my little bitties about 2 weeks old got put in the open coop today they still got their light for warmth at nite . But at like 90 for daytime temps it had been being turned off in the daytime windows open they have been doing so great. It was so funny watching them chest bump , run & chase all over the coop Their world just really expanded . That tub was getting small for 15 chickeys . I was shocked this am when I found 1 out of the brooder tub so I decided to turn them loose in the coop. Been working on their run all day putting all that darn hardware cloth around the bottom yeow my fingers. All the chain link is up 3/4 of hardware is up so not much longer they can be in their run .