Agree here Stony. I never go by just one site's advice. I always read about other's experience with the breed as well.and the key is by searching out owners and breeders of said breed, not by some chart on a hatchery or some website. For instance Hatchery's say Sumatra's are for heat only. Yet there is a thread on BYC funny enough called the "Sumatra thread". Last I looked 143 pages of real world experiences with them. Last picture I saw was of 2 roosters in waste deep snow with single digit temps. If I listened to a silly chart and not real people I never would have gotten Sumatra's. Yet there are about 65 of them outside right now while it is below zero still at 10 am and they are behaving like normal chickens.
With that said, I have never in 9 years lost a bird to cold weather. I don't heat, insulate or otherwise pamper the birds. They condition themselves to the elements just like a wild turkey, grouse or pheasant does. If birds could not take care of themselves in the cold we would not have any wild birds left.
I think most breeds can be acclimated to the cold. Anyone have any examples with birds you WOULDN'T keep in my conditions?
I have a whole lot of breeds that WOULD NOT do well in Florida weather in the summer. My cochins, and my silkies especially. They pant all day in the summer, even in the shade here.. We rarely hit 90. It's usually between 75-85 for a daily high with night time temps in the 50's-60's.
They all do fine if given proper shade and water. That's why I love how my property is surrounded by trees and forest. They love spending their summer digging around there.