Yeah, that’s really tiny, I’m afraid. A total of 16 square inches.
The very rough figure is AT LEAST one square foot - 144 square inches - of open ventilation PER BIRD, and depending on your layout, it often needs to be more.
Ventilation is openings up high, well over their heads when they’re on the roosts for sleeping. (Ventilation = good; drafts on body = bad.) If you have a standard built gable roof in the form of an upside-down V, can you open up the triangle portions at the top, under the V?
The idea is that fresh air flows into the coop at the very bottom and moves up the walls to the ceiling and out, carrying the moisture and ammonia from the chickens out of the coop.
It’s ok if it’s cold inside the coop, as long as it’s (1) not humid and (2) not drafty at chicken level.
But yeah, that’s why you’re seeing condensation inside your coop, and it’s a very important warning sign that you don’t want to ignore.
It can be hard to wrap your mind around this, so please do watch the video that
@thecatumbrella linked above.
