I have 6 little stinkers that are just over 5 wks and I have slowly been weaning them off the heat(100 watt then 60 now box propped open and going outside the box in unheated garage everyday for a little while), but when can I turn it off completely .I live just out side of Syracuse NY and today it is 13 degrees. My other girls live in a unheated coop and have no problems with it which is where these guys will be going . Mind you the 7 mo old girls in the coop are buff orps and these 5 weekers are mutts and are not nearly as big and puffy. This is only my second batch of chicks so any help is greatly appreciated. TY.