The eaves are not open for ventilation, but that would not be all that hard to do. They would have to be weather tight during the cold winters here.
Where I live in N/W Connecticut we don't get the extreme heat in the summer, but we do get some very cold weather in the winter (1300' elevation).
I have those small fold out doors at each end and the two windows plus some holes drilled at the peaks, Since the coop is so mobile I can move it to all day shade during our hot spells, and I have plans for a screen door for daytime ventilation. At night, the roost is in front of the hardware cloth covered window openings for ample ventilation.
Keeping the coop draft free in the cold weather was my biggest concern. That,and critters (hawks, fox, coyotes, fishers, bears and dogs)