apr 25, 1902 - Air Conditioner
Description:
In 1902, the first modern electrical air conditioning unit was invented by Willis Carrier in Buffalo, New York. It was a device to blow cold air into a space. It helped people cool off when they were inside of hot places.https://en.wikipedia.org/wiki/Air_conditioning
Added to timeline:
Date:
apr 25, 1902
Now
~ 124 years ago