I have one americana hen because we lost the chicks to respiratory infection and the hen is currently on meds for it. Anyway we live in the northwest panhandle of FL and the temps are dropping into the 30-50's at night. Her coop is closed on all sides and the floor is mesh. The rood is ribbed plastic. My question is if I should heat the coop at night? The coop is 4ft by 3ft and 4ft off the ground.