The cold with 3 chickens

[FrostRanger]

I don't actually see any ventilation. We have something similar that we use for a brooder and I had to get someone to cut openings in it all around, and I bought (don't laugh!) plastic floor vents that I had installed so they would be predator-safe. It was the most economical solution I could come up with! We had to caulk them in as the shed itself is double-walled. Air flow is not a problem unless it blows directly on the birds, ruffling their feathers. So if you can provide air flow over their heads when they are roosting, that would be very good. Lower the roosts if you have to. Ventilation eliminates buildup of ammonia, which is toxic for the birds to breathe, and it also prevents buildup of condensation, which leads to frostbite on combs and wattles. Aim for one square foot of ventilation per bird and if you can't get that, get as close to it as you can!

The ventilation is where the hardware cloth is