Hello: My girls are at the age of three months (5) and two months (3). I live in Southern NJ and the night temps are starting to drop below 50 degrees outside. We're still using the heat lamp in the coop at night by hanging it from the ceiling (actually have two but only use one for right now). The coop has actually been insulated and interior walls put over that. The temps inside the coop has averaged about 50 degrees the past two nights. I know the B.O.'s are winter hardy and can withstand colder temps but at what age???? My other question: Should we continue to use the heat lamps because they are still quite young and is there an age we should stop using the lamps. Keeping in mind our winter nights can gat below 30 degrees. Any suggestions or thoughts would be a help, since we are new comers..... p.s. we did notice if it gets too warm in there they pant a lot. Thanks..