If your coop is draft free your chickens will generate enough heat on their own. Make sure that your roosts are wide enough. Don't use round dowel rods or branches. To keep their balance they have to rise up. If you use a roost that is at least 2" wide (mine are 3 1/2") so they can stand on it rather than grasping it. They then can lower their bodies down over their feet, expand their feathers and stay much warmer. I have a ceramic heater that turns on at 35 and off at 45 but it is mainly to keep the water from freezing.
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