More emphasis on airflow, more earthworks, more trees, and more passive solar design. That means fewer south facing windows, open features like patios, less bare lawns, building into berms, and various forms of sunshading.

I live in such a climate, and a pergola I built specifically to shade the west-facing sliding glass door has probably made a 10 degree difference in the temperature of that room. Great example of where A/C previously let the architect be lazy.

Whole house fans for cooling at night, insulation & air sealing up the wazoo for staying cool during the day. More focus on radiation-blocking windows.