Its crazy my chickens pick on each other constantly then when they go to roost their best buddies. They put their wings over each other to stay warm & then the next day they hate each other. Guess, what I'm trying to say is chickens will snuggle together to keep warm I've never used heat but then again I don't live in NY. I would not add heat seems the birds stay healthier & acclimatize to their existing environment. My main concern when its cold out is keeping the cold wind off the birds.
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