The next important consideration is ventilation and air flow are often not solved by the same methods.
Excellent point!
This is why Monitor and Clerestory roofs work so well -- letting the heat get out at the top and drawing cool air in from below. The flat-roofed brooder, however, gets hot despite having over 16 square feet of ventilation. There's nothing to move the hot air out.
My coop is the coolest place in the yard, despite being located in full sun because of this and because I took advantage of local microclimates and the air currents on my property.
https://www.backyardchickens.com/articles/repecka-illustrates-coop-ventilation.77659/
We do all of the above. Mostly open air coop, lots of ventilation and double shade cloth. I put frozen water bottles in the nest boxes for them to lay against. We have large terra cotta plant saucers we fill with water that they stand in. I also will sprinkle the ground in the big run for them. Lots of cool water.

