It's a pole building. With the ridge cap and the vents on the overhanging parts. (I'm not good with what all those parts are called.) Have big windows with hardware cloth can shut up tight in cold weather and open during the day. I think the ventilation is good.
Could we see photos?
The standard is a minimum of one square foot of ventilation per bird. That's permanent ventilation that is never shut off. Windows that are closed in winter and the pop door that's closed at night are supplemental ventilation that don't count toward that standard.

My personal rule of thumb is to put my head and shoulders into the coop on a hot, sunny day and find it no hotter inside than outside. More objectively, if the ventilation is adequate both the temperature and the humidity inside should be the same as the outside.