I installed a chicken door, in the door, of the GH. Like a dog door, only without a flap. I kinda do have confidence that hens could learn to use a flap, but to stay on the safe side, no flap.
It’s important so that the chickens can come and go without opening the big man door and letting all the heat flow out. Chickens like to be outside, even in the snow (temporarily), but the point of having them in the GH is to keep them warmer than outdoor temperature.
The hens were very interested, right away. They always seem curious when the tools come out. Even though the man door was also open, right away they had to try out the new door.
I have a theory that (the aphorism about killing cats notwithstanding) curiosity is an essential survival trait. All animals seem to have it. Bees have it. Just plain curiosity about novelty. If we all have it, then our species’ ancestors that survived had it, and it must have helped them survive. So in fact, curiosity saved the cat. Certainly the chicken at least.
I’m going to have to put another on the opposite end doors, but I have yet to do the deer netting on the other hen yard.