I am new to chickens and got my first two about a month ago and another 2 about 2 weeks ago. The first two were moved out to the coop when the second two arrived so I can use the cage for the babies. The two that are out in the coop are doing well. I gave them the heating lamp 24/7 and then started turning it off during the day. The weather has changed and I put the heating lamp on 24/7 again. Is this necessary? It's cold to me, but maybe not for chicks. They are 5 weeks old. The coop is 4X4, insulated walls and ceiling with R15, but have two windows, a door and a nesting box attached from the outside that is not insulated. When should I turn the heat off and what is the best way to wean them off of it? The babies are about two weeks old. When can I introduce them to the older ones?