I moved my 9 wk old chicks from the basement to their new coop which is insulated. They certainly appear to be fully feathered and the lowest temp at night has been 65 degrees. They all huddled in the corner in the evening and I'm sure thru the night like they are cold. Should I put the brooder light in there for night time? I would think if they are fully feathered, this temperature should not bother them.