The light is to keep them laying. If you use an incandescent bulb, it will add some heat to the coop.
I live in Fairbanks, this will be my first winter with chickens, but I won't add heat unless it gets below minus 20 for a prolonged period. You do have to make sure they'll have access to liquid water, which will mean some kind of heated waterer. You can probably buy one for about $60, or make one for cheaper. Look at other threads to find out about cheap alternatives to fancy storebought equipment!
But remember, the ptarmigans and spruce hens and ravens and chickadees and red polls and owls and even some ducks overwinter in Fairbanks, and they don't have nice sheltered coops and good digestible feed in troughs where they don't have to hunt for it, and they seem to do okay. So I'm assuming my chickens will do okay having a nice sheltered coop to hide in when the cold winds blow. My friends up here with chickens say they manage without heat, except in extreme conditions.
(Okay, those of you who live in the tropics might think anything below freezing is extreme, up here, not so much!)
I live in Fairbanks, this will be my first winter with chickens, but I won't add heat unless it gets below minus 20 for a prolonged period. You do have to make sure they'll have access to liquid water, which will mean some kind of heated waterer. You can probably buy one for about $60, or make one for cheaper. Look at other threads to find out about cheap alternatives to fancy storebought equipment!
But remember, the ptarmigans and spruce hens and ravens and chickadees and red polls and owls and even some ducks overwinter in Fairbanks, and they don't have nice sheltered coops and good digestible feed in troughs where they don't have to hunt for it, and they seem to do okay. So I'm assuming my chickens will do okay having a nice sheltered coop to hide in when the cold winds blow. My friends up here with chickens say they manage without heat, except in extreme conditions.
(Okay, those of you who live in the tropics might think anything below freezing is extreme, up here, not so much!)