yOU COULD INSULATE THE COOP TO CONTAIN MORE HEAT BY PLACING CARD BOARD UP AROUND THE COOP AND THEN COVER WITH SOME OLD SHEETS OR TARPS THIS WILL KEEP THE HEAT IN THE COOP AT NIGHT ALSO USE A RED BULB TO KEEP THE LIGHT RAYS FROM HURTING THE BIRDS EYES AT NIGHT THE RED BULBS OFFER HEAVY AND EASY ON THE EYES OOPS CAPS WAS STUCK