I always thought that air conditioning was a modern invention.
I just assumed that people simply went without any sort of cooled air up until about 100 years ago.
However, I recently found out that different ancient peoples had their own forms of air conditioning. Take for example the ancient Egyptians, they hung wet reeds in their windows to cool the air via evaporation. This is much like the swamp coolers that we use today. Before the Egyptians, people used to live in caves and take advantage of geothermal cooling. Caves stay the same temperature year around. We need thermostat to do that now. The Greeks used hot or cool water to heat or cool their palaces. We still use this technique in some homes that are heated or cooled with pipes that run under the floors The Chinese invented hand-powered fans. In the Middle East, they thought up air cooling techniques that used the natural air flow to cool their venues. And, the high ceilings of the Victorian Era were that way to keep the heat out of the buildings. The modern air conditioner was actually invented as a way to reduce humidity but it is safe to say that our current HVAC systems utilize all of those things that our distant relatives knew and used. It is easy to fall into the fallacy that only our generation has the brains to invent new things and that only now can people live in comfort. This is wrong, people have been inventing ways to stay cool and comfortable since as long as there were people on this earth.