Leader air conditioner is a brand of Haier. The Tongshuai brand is the latest third brand launched by Haier Group after Haier Casarte. It is a new customized home electronics brand launched by Haier.

An air conditioner is an air conditioner. It refers to equipment that uses manual means to adjust and control the temperature, humidity, flow rate and other parameters of the ambient air in a building or structure. It generally includes cold source/heat source equipment, hot and cold medium transmission and distribution systems, terminal devices and other auxiliary equipment. It mainly includes refrigeration host, water pump, fan and piping system. The terminal device is responsible for utilizing the cold and heat transmitted and distributed to specifically handle the air condition 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.