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Drafts are the first thing to be an issue, even when temps are still very much above freezing. Take care of all draftiness first, definitely. (Maintaining closeable ventilation openings up out of the way of the chickens, of course)
Water, as momofdrew so drolly points out, freezes at 32 F, but when this happens IN YOUR COOP depends on things like draftiness and insulation and chicken population and so forth. If your coop doesn't stay rather warmer than the outside air, either it's a real big coop for the # chickens (not necessarily a bad thing of course!) or you're doing something wrong. How *much* above the outside temperature depends very, very much on the construction details of your particular coop, and the chicken population it holds.
Also, you can plug along for a good while with your water tending to freeze, simply by dumping and refilling it regularly, like a coupla times a day if necessary.
In a well built coop you probably don't need heat unless you have an unusually cold-vulnerable breed or live above the arctic circle
Good luck,
Pat
Drafts are the first thing to be an issue, even when temps are still very much above freezing. Take care of all draftiness first, definitely. (Maintaining closeable ventilation openings up out of the way of the chickens, of course)
Water, as momofdrew so drolly points out, freezes at 32 F, but when this happens IN YOUR COOP depends on things like draftiness and insulation and chicken population and so forth. If your coop doesn't stay rather warmer than the outside air, either it's a real big coop for the # chickens (not necessarily a bad thing of course!) or you're doing something wrong. How *much* above the outside temperature depends very, very much on the construction details of your particular coop, and the chicken population it holds.
Also, you can plug along for a good while with your water tending to freeze, simply by dumping and refilling it regularly, like a coupla times a day if necessary.
In a well built coop you probably don't need heat unless you have an unusually cold-vulnerable breed or live above the arctic circle

Good luck,
Pat