In 1930, the United States first developed a room Air Filter Regulator. Since then, Japan has successively developed floor-mounted air conditioners (1936), window air conditioners (1953), air-cooled heat pump air conditioners (1960) and split air conditioners (1961). In the 1940s, the United States successfully developed rotary compressors for air conditioners. In the 1970s, rotary compressors were widely used in air conditioners produced in Japan, which reduced the volume and weight and improved the cooling capacity. In the early 1980s, Japan realized the frequency conversion control of the air conditioner compressor, which not only improved the comfort of the air conditioner, but also saved energy.

In 1985, the world's output of air conditioners reached 11.51 million units, of which Japan accounted for 47.2%, the United States accounted for 23.6%, France accounted for 5.2%, and Canada accounted for 4%. Japanese air conditioners are mainly split type, while the main product in the United States is still window type air conditioners.

China began to develop air conditioners in 1963. In 1965, Shanghai Refrigerator Factory (now Shanghai Air Conditioner Factory) produced the first batch of window air conditioners. In 1985, China's output was 122,000 units, most of which were window air conditioners.

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