Hi all, I need to know how cold is to cold in the coop at night for my 9 chickens? they sleep on two perches. 4 on one and 5 on the other. its getting into the low 30s, and there all fluffed up. I heard it depends on the breed. but I have no clue as to what breed they are? :sh should I give them a heater? will they be ok? on of my little hens is molting ;doh so I have a fleece coat on her. she doesnt have many feathers yet. i am a bit worried tonight is so cold. so will they be ok in the low 30s????