In 1906, Stuart W. Cramer of Charlotte, North Carolina, USA was looking for ways to increase the air humidity in his southern textile mill. Cramer named the technology air conditioning and used it in a patent application in the same year as a substitute for water conditioning. Water conditioning was a well-known procedure at the time, which made the production of textiles easier. He combined water vapor and ventilation systems to "condition" and transform the air in the factory, and control the extremely important air humidity in the textile factory. Willis Carrier used this name and put it in the name of the company he founded in 1907: "Galia Air Conditioning Company" (now Carrier Company).
In 1915, Carrier established a company, which is one of the world's largest wall-mounted split air-conditioning companies. But 20 years after the invention of the wall-mounted split-type air conditioner, it has always been machines, not people. Until 1924, a shopping mall in Detroit often fainted due to the sultry weather. First, three central wall-mounted split air conditioners were installed. This was a great success. The cool environment made people's consumption desire greatly increased. Since then, wall-mounted split air conditioners have become a powerful tool for businesses to attract customers, and the era of wall-mounted split air conditioners serving people has officially arrived.
