I've read a lot about when chicks can go outside based on acclimatizing to the cool temperatures, but not so much about heat. I understand that young chicks can't regulate their temps if it is too cold, but what about warm? It's in the 90's during the day here and only in the 70's at night. Right now, the 4-1/2 week old chicks are in the shade on the porch and seem to be okay. I check them frequently and will bring them in in late afternoon. (Of course, shade and water are always available.) My questions: Will they be any better able to regulate heat as well as cold when they are fully feathered? Or is cold the main concern?