We are again looking at -teens with up to -35 wind chills. This is winter in Wisconsin. I have never provided extra heat, every winter all my chickens survive and go outside most days, my shed has an open doorway to the southeast and is not insulated. They will look cold but I get them moving with scratch, and standing with feathers fluffed and even shivering is a natural way to warm themselves, and I give them warm water. I always provide hay to stand on, and proper roosts, I don't have chickens with frostbite on their feet this way.
Chickens are biologically different than humans and can get too hot with extra heat if they can't escape it, put on your warmest coat and stay in your house to see how it can feel, it can sometimes lead to aggressive behaviors, so if you are providing heat make sure they can get away from it. If you choose not to heat don't feel guilty as they really don't need it, I have kept silkies and currently frizzles and they are fine.
Chickens are biologically different than humans and can get too hot with extra heat if they can't escape it, put on your warmest coat and stay in your house to see how it can feel, it can sometimes lead to aggressive behaviors, so if you are providing heat make sure they can get away from it. If you choose not to heat don't feel guilty as they really don't need it, I have kept silkies and currently frizzles and they are fine.