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< p>Air conditioner is air conditioner. It refers to the process of adjusting and controlling the temperature, humidity, cleanliness, speed and other parameters of the ambient air in a building/structure using manual means.

Generally, it includes cold source/heat source equipment, hot and cold medium transmission and distribution systems, terminal devices and other auxiliary equipment. Mainly includes water pumps, fans and piping systems. The terminal device is responsible for utilizing the cold and heat transmitted and distributed to specifically process the air and temperature so that the air parameters of the target environment meet the requirements.

The original air conditioners and refrigerators used toxic gases such as ammonia and methyl chloride. The leakage of this type of gas can cause major accidents. Thomas Midgley invented chlorofluorocarbon gas in 1928 and named it Freon. This refrigerant is much safer for humans, but is harmful to the atmospheric ozone layer. Freon is DuPont's trademark for CFC, HCFC or HFC refrigerants, each of which also includes a number to indicate the molecular makeup of its ingredients (e.g. R-11, R-12, R-22, R- 134). Among them, R-22 HCFC refrigerant, which is the most widely used in the field of direct evaporative moderate cooling products, will stop being used in new production equipment starting in 2010, and will be completely stopped in 2020. R-11 and R-12 have been discontinued in the United States. As an alternative, some ozone-friendly refrigerants have come into use, including the refrigerant R-410A under the trade name "Puron". New environmentally friendly refrigerants R290 and R32 are also gradually entering the market. The R290 molecule only contains carbon and hydrogen, does not contain chlorine and fluorine, and has zero ozone depletion potential (ODP).