Just went outside at midnight with a infrared thermometer to check the coop temperature.
Outside air temperature: 22 F; windchill 11 F
Inside the shielded run: 45 F; ground temperature: 50 F
Inside the insulated coop: 35 F to 45 F (with one window and the coop door opened)
Chickens' outer feathers: 90 F
I guess this explains why the chickens are not afraid of cold, they are quite insulated.
Outside air temperature: 22 F; windchill 11 F
Inside the shielded run: 45 F; ground temperature: 50 F
Inside the insulated coop: 35 F to 45 F (with one window and the coop door opened)
Chickens' outer feathers: 90 F
I guess this explains why the chickens are not afraid of cold, they are quite insulated.