While building with different materials DOES change insulation, that doesn’t mean it always makes the buildings cooler.
On the contrary, building with bricks, as is standard for all year residential buildings throughout most of Europe is a way to trap and detain heat, NOT a way to keep heat out.
You see, the greatest temperature difficulty before anthropogenic global was the outside being too COLD, so that’s what we’ve been building for and because of that, AC hasn’t been as necessary.
Nowadays though, the heat retaining structures with no AC are becoming unbearably hot for much of the year. We desperately need environmentally responsible AC.