Did you put an awning around the outside of the house? At least on the first floor? This is a common feature in Australian houses to keep the actual house shaded and cool.

Another interesting feature are houses that are built on brick pillars raised off the ground without a concrete slab. It’s amazing how even on a hot day they remain quite cool underneath and seem to cool off quicker at night. Many older wooden houses seem to be built this way.

I like to mentally toy with the idea of high rises or large apartment blocks having some kind of large retractable awnings on the sunny side of the buildings, or some kind of fake outside wall which can diffuse some of the suns light / heat.