Been reading everyone's winter preparations and I think I should feel guilty but I don't, my large fowl are kept in a large tin pole shed with my donkeys and goats, it's not insulated, I have a east facing door that stays open year round for the donkeys to come and go, my chickens have the run of all parts but where the hay is stored, they all find the best spots to roost, we did add a few clear panels to let more light in, but I never light my birds, most of my poultry is out and about all winter, I don't even use any water heaters, I use rubber buckets that the ice gets knocked out twice a day and refilled with warm water.
It can get brutal here some winters in Wisconsin, but my birds do fine, so I do drool over everyone's greenhouse runs but my larger chickens don't even have one. I know my birds all acclimate to the weather and do fine, even my frizzle Cochin bantams. I do throw out corn and black oil sunflower seeds twice a day to get them moving around, and some hay to pick through and stand on. I also will use some hay bales as wind blocks and my chickens love sitting on them and pecking them.
Some really interesting information, and I enjoy how everyone has a different opinion on what is considered cold for poultry. A day of 30 degrees is a warm balmy day here in the middle of winter.