Well, here's 5 ways people kept their homes cool before the wave of air conditioning came in to play;
Ceilings as high as 10, 12 and in some cases even 14 feet were common in older homes. As heat rises to the ceiling, it allows for the air below that to remain cool and comfortable. Additionally, ceiling fans that were powered by electricity or elaborate rope systems also helped to facilitate air movement.
Thick brick masonry or stone walls were a great insulator and did well to keep homes cool. Walls that could be up to 24 inches thick were common in certain parts of the world and were capable of blocking sunlight coming in during the day, whilst keeping the place warm at night as the chill would set in.