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The Invention That Changed The World

On July 17, 1902, Willis Haviland Carrier designed the first modern air-conditioning system, launching an industry that would fundamentally improve the way we live, work and play.



The Launch of Carrier Air Conditioning Company

In the opening decades of the 20th century, Willis Carrier established Carrier Air Conditioning of America as the worldwide leader, advancing the science and application of air conditioning across multiple industries around the globe.



Manufactured Weather

Launched as an independent company in 1915 by Willis Carrier and six other courageous entrepreneurs, Carrier Engineering Corporation provided manufactured weather to over 200 industries with an unmatched promise of "the whole job, the whole responsibility, and a contract for results."



Beyond the Factory

The introduction of centrifugal refrigeration by Willis Carrier in 1922 was a landmark event, launching modern air conditioning from the factory floor into movie theaters, office buildings and department stores, and treating the general public to its first taste of cool, clean and comfortable "Manufactured Weather."



Weathermaker to the World

Despite the Great Depression, Carrier Corporation never stopped investing in the art and science of air conditioning leading the industry in railroad and marine applications, and pioneering the creation of efficient systems for business and home. The company extended its reach to markets in every corner of the globe, enhancing its unparalleled position as "Weathermakers to the World."



Distinguished Service

Carrier Corporation provided exceptional leadership throughout World War II even as it prepared diligently to meet the needs of a postwar world. In his final decade, Willis Carrier successfully completed one of the most satisfying projects of his storied career before becoming Chairman Emeritus and turning his company over to a new generation of leadership.



Growing With the Babyboomers

A half-century after his invention of modern air conditioning, Willis Carrier's rich legacy included the creation of a billion-dollar industry and founding of the preeminent global provider of commercial air conditioning. In the next 25 years, Carrier Corporation grew with the postwar baby boom to become the largest player in the flourishing market for residential comfort air that would change the face of the world.



Expanded Global Reach

The marriage of United Technologies Corporation with Carrier proved to be a formidable combination, resulting in creation of a Global Manufacturing Platform and market leadership in every region of the world, backed by an unparalleled commitment to environmental sustainability.



Natural Leadership

Built on Willis Carrier's extraordinary invention of modern air conditioning and his unyielding commitment to innovation, Carrier today is a lean, focused company meeting the needs of local markets with global resources, and leading the industry with products that delight customers while protecting our fragile envirionment—natural leadership for the 21st century.



In the opening decades of the 20th century, Willis Carrier established
Carrier Air Conditioning of America
as the worldwide leader, advancing the science and application of air conditioning across multiple industries around the globe.


The Launch of Carrier
Air Conditioning Company

Sometimes genius arises in the most unlikely of places. For Willis Carrier, the moment of profound insight came in late fall 1902 on a cold, foggy train platform in Pittsburgh, Pennsylvania. As he stared through the dense mist, Carrier recalled thinking, "If I can saturate air and control its temperature at saturation, I can get air with any amount of moisture I want in it. I can do it, too, by drawing the air through a fine spray of water to create actual fog."

It was an insight so counterintuitive that it still dazzles. Willis Carrier realized that he could dry air by passing it through water, using the spray as a condensing surface.

By 1903, he had completed the apparatus first visualized on that foggy Pittsburgh evening, the world's first spray-type air-conditioning system able to both wash and humidify or dehumidify air. Modern air conditioning now had its fundamental building block.


In 1939, Ripley's Believe It or Not! featured Willis Carrier's astounding insight—to dry air by producing artificial fog—conceived as he paced through the natural fog of a Pittsburgh railroad station. Some 80 million readers of Ripley's had their first glimpse of the father of modern air conditioning.


Soon after, Carrier conceived the idea of adjusting humidity by heating the spray water itself and controlling the dew point temperature of the air leaving the conditioning machine. With this came "dew point control" which, an early company brochure announced, was "the greatest single factor in modern air conditioning."

In 1905, at the age of 29, Willis Carrier was made head of the Buffalo Forge Engineering Department, directing research and supervising all application and design. Shortly thereafter, Carrier's staff began referring to him as "the Chief," a name given out of admiration and respect.

The following year Carrier authored a catalog which offered data about his air washer and included the first psychometric chart ever published. This catalog was designed to sell equipment and educate the entire industry. It also contained a prophecy from the Chief that "comfort" applications in public buildings, theaters, churches and restaurants would one day become common.

This was Willis Carrier at his best, grasping a broad concept well before his peers while efficiently solving a specific engineering problem. This "practical genius" gave the company its most outstanding competitive advantage: sales engineers could sell air conditioning for almost any application, convinced that the Chief could design a system suited to their customers' needs. Carrier's focus on sound economics and practical applications was reflected in his most famous creed, described in terms of one of his favorite pastimes. "The 'catch' must be edible or I don't try for it," Carrier would explain. "I only fish for edible fish and test for useful data."

The year 1907 would prove to be a historic one for Willis Carrier and his extraordinary invention. First, modern air conditioning leapt from the textile mill to the pharmaceutical plant with an installation at Parke, Davis & Company in Detroit, Michigan. Then, a proposal was made to the Huguet Silk Mill in Wayland, New York, guaranteeing a relative humidity of 65 percent throughout the entire year—the first promise of conditions and not simply equipment performance.

It took little time for Willis Carrier and his engineering team to turn insight into a commercial solution. The Buffalo Forge Company soon became a leading supplier of air washers and humidifiers to a variety of industries around the world.


The textile industry was among the earliest and most enthusiastic adopters of modern air conditioning. Here, buyers for New England Cotton work in a clean, efficient environment.


However, the single most enduring advance came in 1907 with the first sale of Carrier's air-conditioning equipment to an international customer, the Fuji Silk Spinning Company in Yokohama, Japan.

Installed in Fuji's Hodogaya Mill, the system reduced dust and static over 60,000 spindles, providing a showcase for modern air conditioning that astonished visitors for nearly 40 years with its positive impact on efficiency and working conditions. Carrier's efforts in Japan would increase throughout the century to include the country's first completely air-conditioned building in 1933, and four years later, the world's first completely air-conditioned ship, the 8,000-ton liner Koan Maru.

The world's first fully air-conditioned ship, Japan's Koan Maru, was completed in 1937 with Carrier systems.


Few of Willis Carrier's activities in the opening decade of the 20th century would have a more lasting impact than the first international sale of modern air conditioning in 1907 to the Fuji Silk Spinning Company of Yokohama, Japan. Dr. Carrier spent a lifetime advancing air conditioning around the world. He is shown here (top row, third from right) taking a break from the World Engineering Congress in Tokyo in 1929, accompanied by Japanese entrepreneur Mikimoto Kōkichi (center) at Mikimoto Pearl Island.

Thirty years after the Fuji installation, the Japanese Association of Refrigeration elected Willis Carrier an honorary member in recognition of his many contributions.

It was also lasting recognition that this first sale in 1907 launched a global industry that continues over a century later to expand into new regions and original applications.


The sale of modern air conditioning in March 1914 to the Allegheny General Hospital in Pittsburgh, Pennsylvania, was used to establish the first incubator room, capable of providing a healthy, comfortable environment for infants. Air conditioning for patient care would be adopted by hospitals around the world throughout the 20th century.


By late 1907, management at Buffalo Forge had fully grasped the opportunity for air conditioning and moved to create a wholly-owned subsidiary, the Carrier Air Conditioning Company of America. Officially incorporated on April 18, 1909, the name was fitting recognition of Willis Carrier's leadership in this remarkable new industry.

Carrier immediately landed an important contract with the Celluloid Company, a firm making film for the new motion picture industry. As business in the textile industry expanded, the company also won contracts to install air conditioning to reduce rust on razor blades at the Gillette Safety Razor Company, in factories producing rubber, rayon, flour and baked goods, and in a Pittsburgh hospital ward for premature babies. In 1913 a system was sold to an American Tobacco Company facility in Richmond, Virginia. "I never saw such a dusty atmosphere," the Chief recalled. Going to work on the problem, he devised the first "pan outlet" to distribute air gently from the ceiling. "The results were wonderful," Carrier reported, and employees from other parts of the plant began eating lunch in the cool, clean air.

Robust sales of the Carrier Air Washer and Humidifier helped launch Carrier Air Conditioning Company of America in 1907. Above, Alfred E. "Ned" Stacey, Jr., assistant to Willis Carrier in the early development of modern air conditioning, services one of the company's first installations.


The Carrier brand became synonymous with innovation and quality from its launch in 1907.

The company pushed into new frontiers, selling a humidifying system to the Astor Hotel in New York City, and in 1914 to the Baltimore and Muehlebach hotels in Kansas City, Missouri. These latter installations included mechanical refrigeration and were targeted at the very earliest kind of comfort cooling—not just improving production efficiencies, but trying to make people feel better.


Willis carrier's Rational Psychrometric Formulae brought science to what had been the often hit-or-miss design of air-conditioning systems, in the process making Carrier an international name. The chart would be updated and reprinted regularly, serving as an essential tool to generations of engineers.


In 1911, Carrier's research and development efforts came together in the single most famous and enduring document ever prepared on air conditioning. His "Rational Psychrometric Formulae," called the "Magna Carta of Psychrometrics," was presented on December 8, 1911, at the annual meeting of the American Society of Mechanical Engineers (ASME). The Chief's invitation to this meeting recognized air conditioning as a legitimate branch of engineering and Willis Carrier as its leader. His psychometric chart, used to correlate temperature and humidity in the design of air-conditioning systems, would be reproduced in college textbooks and translated into many languages. It is the predecessor of the charts used today. At the age of 35, Willis Carrier had become internationally recognized.

By 1914, Willis Carrier completed an ambitious project to create a "compact, concise, and complete book on air" from which engineers could "design, specify, sell, buy, service, or operate the equipment that handles air." Carrier's work became the definitive text in the air-conditioning industry.

The company that bore his name sold hundreds of installations, adding malt houses, candy and processed food, breweries and meatpacking houses to its customer list. Professional societies followed the lead of ASME and included air conditioning in their programs. Consulting engineers and architects became interested in specifying air-conditioning equipment. The company's network grew rapidly, as did competition. Barely a decade old, Carrier and its engineers had placed the new industry solidly on its feet.

However, other momentous events were unfolding elsewhere. The start of war in Europe in July 1914 increased economic uncertainty, and management at Buffalo Forge elected to confine their operations to traditional manufacturing. This meant the immediate dissolution of Carrier Air Conditioning Company, with only Willis Carrier and J. Irvine Lyle to remain while all other employees of the young company were to be let go.

Just as the business had taken hold it was about to be shut down. Fortunately, Willis Carrier had other ideas.