We're now hitting our summer heat here in GA in July.
No issues to the coop, nothing I'd change yet to improve upon. - Though I never did end up attaching the fencing. We realized it would make it harder to see the chickens inside their area by blocking our view, so we've just left it off.
In the last 3 days just started having our black copper maran and rhode island red start laying.
Even the largest, a light brahma, is still happy with our enclosure opening sizes.
The two that just started laying have been in/out of the coop even in peak heat of the day, and with the shade of the roof it's never felt too hot in there. Temperatures inside the coop register the same as outside under the roof.