Dry and no clipping gale, but good ventilation, they'll be fine.

 

As I stated on that other thread --- our chicken coop is not insulated and we sometimes get down to -40.
We need to water more frequently and check for eggs before they freeze but the chickens seem to get along fine in the extreme cold.

We usually average between 6 - 8 chickens at a time.
Our coop is about 4 ft X 5 ft.....and is elevated about 14 inches off of the ground.

It has one window that slides open and last winder it was stuck in the OPEN position for most of the winter.

I think the most important thing in winter --- no matter what the temperature --- keep the floor dry.

 

Insulation does little good for chickens. They produce lots of moisture and need lots of ventilation which mostly negates the insulation. If given good ventilation most breeds don't have any trouble in subzero temps. The only issues we ever ran in to were bantam breeds not known for their cold weather tolerance like japanese and seramas suffering comb frostbite if the humidity wasn't kept low enough. I ended up dubbing a few but otherwise even the seramas survived -20 to -30F just fine.

 

Thanks! Very helpful!