The History of Air Conditioning: A Century of Evolution from Industrial Equipment to Smart Living
An air conditioner, also known as an air conditioner, is a device that comprehensively regulates the temperature, humidity, cleanliness, and airflow of indoor air. Today, it's an essential appliance in every household, but its origins lie not in human cooling, but in the needs of industrial production. Through over a century of technological iteration, air conditioners have evolved from bulky industrial devices into energy-efficient, quiet, and intelligent household appliances, fundamentally changing the way people live and work. Its development can be divided into six core stages, fully witnessing the revolutionary path of refrigeration technology and the home appliance industry.
I. Theoretical Emergence Period (18th Century - Late 19th Century): Foundation of Refrigeration Technology
The invention of modern air conditioning is based on early explorations of refrigeration science theories and equipment. In 1755, Edinburgh chemistry professor Coulomb first discovered that ether evaporation could achieve cooling and freezing, thus opening the scientific prelude to artificial refrigeration. In 1834, American Jacob Perkins applied for a patent for ether closed-loop refrigeration, establishing the basic framework of vapor compression refrigeration and providing core principle support for the subsequent development of refrigeration equipment.
In 1842, John Gory, a physician in Florida, USA, developed a simple ice-making and cooling device to treat yellow fever and improve the ward environment. This device could cool and dehumidify the air and was the earliest prototype of air conditioning. In 1844, Gory formally improved the air refrigeration machine, achieving preliminary artificial control of air temperature and accumulating crucial practical experience for the birth of modern air conditioning. All explorations at this stage focused on verifying the refrigeration principle and had not yet formed a complete air conditioning system.
II. The Birth of Modern Air Conditioning (1902-1920): The First Breakthrough in Industrial Applications
1902 marked the beginning of modern air conditioning. Willis Carrier, a 25-year-old American engineer, was commissioned by a printing plant in Brooklyn, New York, to solve production problems caused by high temperatures and humidity in summer, leading to paper warping and inaccurate color printing. He successfully developed the world's first modern electric air conditioning system. This equipment could precisely control air temperature and humidity, stabilizing the production environment and marking the official birth of modern air conditioning technology , completely different from traditional single-function refrigeration equipment.
In 1906, textile engineer Stuart Cramer first coined the term "Air Conditioning," precisely defining the core technology of air temperature and humidity control, a term still used globally today. That same year, Carrier patented its air handling unit, formally establishing the technological system of modern air conditioning. Air conditioning equipment of this period was bulky, consumed extremely high power, and was very expensive, serving only industrial production scenarios such as printing plants and textile mills, completely excluding the civilian market.
III. Commercialization Period (1920-1940): From Industry to Public Scenarios
In the 1920s, air conditioning technology underwent its first iterative upgrade, gradually shifting from the industrial sector to public and commercial settings. In 1922, Carrier completed a core technology improvement, replacing the original toxic ammonia refrigerant with a safer one. At the same time, it developed the centrifugal chiller, which significantly reduced the size of the equipment and improved its operational stability, making the commercial application of large-scale air conditioning equipment possible.
In 1924, a large department store in Detroit, USA, installed commercial air conditioning in bulk for the first time. The constant and comfortable indoor environment significantly increased customer traffic, allowing the public to experience the comfort value of air conditioning for the first time. Subsequently, public places such as movie theaters, theaters, government meeting rooms, and the White House installed air conditioning, and the function of air conditioning shifted from "serving production" to "enhancing the living experience." In 1928, Carrier launched the first prototype of a residential air conditioner, the Weathermaker, which had complete air conditioning functions. However, the device occupied an area of 1 square meter and had extremely high power consumption, making it only suitable for high-end large homes and unable to be widely adopted.
In 1926, the first lightweight civilian air conditioner was introduced, further lowering the equipment threshold. However, due to limitations in technology and cost, the civilian market remained largely untapped. After the outbreak of World War II, global refrigeration technology and production capacity were prioritized for the military sector, used for refrigeration of warships, food preservation, and medical cold storage. The research and development and popularization of civilian air conditioners stagnated for more than a decade.
IV. Civilian Iteration Period (1940-1990): Miniaturization and Widespread Adoption
After World War II, civilian technology recovered rapidly, and air conditioning officially entered the stage of household popularization. In 1947, the world's first mass-produced window air conditioner was officially launched. Its integrated structure made installation convenient and greatly reduced the threshold for use, becoming the first household air conditioner for ordinary wealthy families. However, the equipment was noisy and energy-consuming, and its performance still had obvious shortcomings.
From the 1960s to the 1980s, Japanese companies made key improvements to air conditioning technology, successfully developing split-type air conditioners that separated the indoor and outdoor units. This completely solved the problems of window air conditioners, such as high noise levels, large space requirements, and poor sealing, and became the mainstream form of modern household air conditioning. In 1998, Japan developed DC inverter technology, which revolutionized the operation of traditional fixed-frequency air conditioners, significantly improving energy efficiency, temperature control accuracy, and operational stability, ushering in the inverter era for air conditioning technology.
Meanwhile, air conditioning refrigerants continued to evolve, with environmentally friendly HFCs (hydrofluorocarbons) gradually replacing traditional high-pollution refrigerants. This balanced cooling efficiency with environmental requirements, laying an environmental foundation for the widespread adoption of air conditioning. During this period, air conditioning completely shed its high-end luxury status and rapidly gained popularity in developed countries such as Europe, America, and Japan.
V. The Rise of Domestic Products (1970-2000): The Development of China's Air Conditioning Industry from Nothing to Something
China's air conditioning industry started relatively late, but its development has been rapid. In 1974, the predecessor of Chunlan Group, Taizhou Radio Components Factory No. 9, successfully developed the first window air conditioner in China, CKF-3A (Cedar brand), filling the gap in the independent research and development of domestic air conditioners.
In 1988, Huabao Air Conditioner Factory developed China's first domestically produced split-type wall-mounted air conditioner, the KF-19G1A (Snow Lotus brand), marking China's mastery of core split-type air conditioner production technology and the beginning of the iterative development of domestically produced household air conditioners. After the 1990s, domestic appliance brands such as Gree, Midea, and Haier rapidly rose to prominence, introducing advanced overseas technologies, building their own production lines, and continuously optimizing product performance. With their high cost-performance ratio and designs adapted to the local climate, they gradually replaced imported air conditioners and occupied the mainstream domestic market.
By the end of the 20th century, domestically produced air conditioners had achieved widespread adoption of fixed-frequency technology and simultaneously pursued research and development of variable-frequency technology, officially entering the global air conditioning industry race.
VI. The Era of Intelligent Innovation (2010 to Present): Comprehensive Upgrades in Energy Saving, Intelligence, and Low Carbon
Since the beginning of the 21st century, the air conditioning industry has moved beyond simple hardware iterations and is upgrading in all aspects towards intelligence, low carbon emissions, and humanization. In 2013, Hisense launched the world's first Internet-connected smart air conditioner, connecting air conditioners with the Internet of Things and ushering in the era of IoT-enabled smart air conditioners. Features such as remote control, intelligent temperature adjustment, and automatic environmental adaptation have been gradually implemented.
From a technological perspective, variable frequency technology has become widespread, and the new Level 1 energy efficiency standard has been implemented, significantly improving the energy efficiency of air conditioners, saving more than 40% compared to earlier fixed-frequency air conditioners. At the same time, the industry continues to promote green innovation in refrigerants, with natural and environmentally friendly refrigerants such as CO₂ and propane gradually being commercialized, adapting to global carbon neutrality and development trends.
Modern air conditioners have long since transcended the single function of temperature control, integrating multiple functions such as dehumidification, sterilization, fresh air, self-cleaning, and dual temperature and humidity control. They are also equipped with AI intelligent algorithms that can automatically adjust the operating mode based on human condition and ambient temperature. By 2025, the penetration rate of smart air conditioners in China exceeded 70%. Domestically produced air conditioners not only occupy the absolute mainstream market in China but also export their core technologies globally, making China the world's largest production, R&D, and export base for air conditioners.
