-1902 the invention of air conditioning the first real air conditioner was 1902 invented by American Kelly. But the first air conditioner was not invented for people, but was "enjoyed" by machines. Today, when we sit at home and enjoy the warm winter and cool summer brought by air conditioning, we should thank a person named Carrier.

Willis Carrier designed the first air conditioning system in 1902. 1906 filed an American patent in the name of "air treatment device".

Carrier's invention was partly due to a disgruntled printing workshop owner in Brooklyn, new york. Because of the change of air temperature and humidity, his printing machine makes the paper stretch and shrink, the oil colors are not arranged correctly, and the printed things are blurred. He became Carrier's first customer, which opened the door to the commercialization of air conditioners for Carrier.

In the next 20 years, Carrier's air conditioners were gradually used to adjust the temperature and humidity in the production process. The largest customer of air conditioners is the textile mills in the southern United States. Because the air humidity is not enough, a lot of static electricity generated by shuttle friction makes the finished cloth fluffy and reduces the quality of the cloth. Later, the problem was solved by adjusting the humidity through air conditioning. Since then, air conditioning has entered many industries, such as chemical industry, pharmaceutical industry, food industry and arms industry. 1907, Carrier exported the first air conditioner to a silk factory in Yokohama, Japan. It is worth mentioning that in the 20 years after the invention of air conditioning, the object of enjoyment has always been machines, not people.

With the expansion of business, Carrier and six friends raised $32,000 to set up Carrier Engineering Company in 19 15. 1922, carrier engineering company successfully developed a landmark product in the history of air conditioning-centrifugal air conditioner, referred to as centrifuge. The biggest feature of centrifuge is its high efficiency, which opens the door for large space air conditioning. Since then, people have become the object of air conditioning services.

At that time, there was a famous department store in Detroit called Hudson. It is famous because it regularly holds big sales in the basement, and people often faint because of the sultry air. Carrier chose Hudson Department Store as the market entry point and installed three centrifuges for it at 1924. This move was a great success, and air conditioning became a sharp weapon for businesses to attract customers.

Air conditioning is actually popularized through cinemas. In the 1920s, the entertainment industry was depressed in summer, because no one wanted to spend money on hot money. 1925 One day, Carrier and new york Riivari Grand Theatre jointly launched a round of intensive air-conditioning advertising bombing with the slogan of ensuring customers' emotional and sensory enjoyment. There was a sea of people outside the Rivali Theatre that day, but almost everyone brought a paper fan just in case. However, the coolness of entering the theater gate completely conquered the audience. Since then, air conditioning has entered a stage of rapid development.

The development of household air conditioners began in the mid-1920s. 1928 Carrier introduced the first generation of household air conditioners. However, the subsequent Great Depression and the subsequent World War II interrupted the popularity of household air conditioners. It was not until the economic take-off in the 1950s after the war that household air conditioners began to really enter thousands of households.

Today, air conditioning has created a world with four seasons like spring for us.