Another great topic....

I'm in Central Alberta, Canada...
This is my Chicken Winter Management...I also have Call Ducks...That's another story....
My Chickens have respiratory disease..Cold weather brings out symptoms...We could be +5C one day and as low as -25C the next..I run heat in my Coop, although it's never that warm..The water does Ice up..I block off the West and North facing vents and keep the other sides open..Breed of Chickens plays a big part in how well the do in cold climates..I have Orpington, Brahma and one little Silkie Cross that sleeps between my Rooster and an Orpington..
I use 2x4 roosts flat side up so they can lay on their feet..
Chickens on a Roost are like a parking lot of Cars running..They breath and moisture rises up and onto combs...Poop also is moisture as is the water in the coops..
My Heat is over the water not directly over my Birds..
I just helped a BYC member relocate her Birds that were not the right breed for our Alberta winters...My Friend bought them to help her out and to save the Chickens from Frostbite...
Knowing the temps of our locations and providing proper feed, water, adequate housing...No Animal should suffer frostbite..
Vaseline is recommended as frost bite prevention...Depepending on how cold you get?...That will freeze too...I recommend certain Cold weather Breeds and management for certain locations..