Air conditioners have been around for a long time. They were first invented in 1902 by Willis Haviland Carrier. Carrier was an engineer who was working in Buffalo, New York. It was a hot summer, and Carrier was trying to figure out a way to keep his air from getting stale. That's when he came up with the idea of air conditioning. He created a system that would cool air by mixing it with water. It wasn't until the 1930s that air conditioners became more popular. That's when they started to be used in movie theaters. How do air conditioners work? Air conditioners work by cooling the air in a room. They do this by taking in warm air, mixing it with water, and then sending the cooled air back into the room. The warm air is cooled when it comes into contact with cold coils. As the warm air comes into contact with the cold coils, it cools down. Air conditioners also use electricity to cool down the room. Air conditioners have many parts, including a compressor and a condenser. T...