How Much Do You Know About Air Conditioning? – 101 Facts About Air Conditioning in 2021

Home / How Much Do You Know About Air Conditioning? – 101 Facts About Air Conditioning in 2021

Did you know that the U.S. annually uses more electricity to power our air conditioners than the amount of electricity used annually by the entire continent of Africa? Wow! We know finding facts and figures about Air Conditioning can be time-consuming and frustrating, so we put together this list of the top 101 facts, notes, and statistics so you can easily reference them and refer back to them any time in the future.  This space is constantly changing, so if you see a fact that is not up-to-date, feel free to let us know. And if you know a stat that we should add, let us know that too!

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1. Homes and buildings were built with high ceilings, breezeways, sleeping porches, landscaping to create shadows, and other features to keep residents cool before air conditioning. 

As air conditioning became the standard, architects stopped designing buildings for the purpose of cooling (making it that much harder when we have to go without air conditioning).


2. Prior to the invention of air conditioning, schools and businesses would slow down or take summer vacations to avoid working in the sun. 

Even after air conditioning became commonplace, schools continued to use the summer vacation system.



3. When AC systems were first introduced, the output settings were calculated in “Ice Power,” or how many blocks of ice were required to generate the same amount of cooling power. 

We now refer to them as AC units (1).



4. Willis Carrier invented the first air conditioner in 1902 to monitor the humidity in a New York publishing house, not for warmth.

He created it to prevent his paper from expanding and contracting, as well as to ensure that his ink dried quickly and without smudges.


5. The first domestic air conditioner, which was over 7 feet high, 6 feet wide, and 20 feet long, was installed in 1914.

People were willing to pay between $10,000 and $50,000 for one, despite its size. That would be between $120,000 and $600,000 in today’s money! Residential air conditioning systems were only available to the very rich. Think what a new HVAC system used to cost the next time you whine about how much it costs now.



6. The first air conditioner in the White House cost $30,000.

The first president of the United States to provide air conditioning in the White House was Herbert Hoover. An air conditioning system was constructed at a cost of $30,000 by the US government.


7. Until the 1970s, most households did not have air conditioning.

Most people couldn’t afford air conditioners until technical advances made them more affordable. Central air conditioning became more common in the 1970s. About 90% of homes in the United States have air conditioning.



8. The first air conditioner was a block of ice. 

People used to stay cool with large blocks of ice before air conditioners were invented to keep things nice and cool. In reality, the first air conditioners’ performance ratings were based on how much ice would have been needed to achieve the same cooling capacity.



9. Warmer states would be deserted if they didn’t have air conditioning. 

Can you imagine not having an air conditioner if you lived in Florida, Texas, or another hot climate? You’re not alone; as home air conditioning became more common, the population of these hotter states grew significantly.



10. Ivy League status was given to the first ventilation system. 

In 1899, Cornell University constructed a ventilation system in the dissecting room so that students could dissect cadavers without being bothered by the smell.

11. Air conditioners and allergies go together like peanut butter and jelly. 

Okay, they won’t taste as good as a PB&J, but air conditioners have been shown to help people with asthma breathe easier. What is the reason for this? Air conditioners can eliminate allergens and other tiny particles from indoor air, resulting in less sneezing and a more comfortable environment.



12. In 1931, the first room air conditioner was invented. 

The first room air conditioner was invented by H.H. Schultz and J.Q. Sherman in 1931. The air conditioner stood on the ledge of a window, as do many modern room air conditioners.



13. The Cave Dwellers were the first to build homes that were cooled by geothermal energy.

It is common knowledge that it is hotter underground and inside the planet. Years ago, perhaps about 10,000 BC, the first human hunter-gatherers found it out for us. Not only did they live in cool caves, but they also dug underground burrows to avoid the sun. Geothermal cooling is now the latest and best in cooling technology, after 12,000 years!



14. Water-cooled air conditioning was invented by the Egyptians.

How clever do you have to be to find out how to build massive pyramids out of rock without using any power tools? Those Egyptians had a real knack for problem-solving, and you can bet the Nile River valley in Africa was scorching hot. So, in the absence of modern air conditioning, how did they remain cool? To keep the breeze out, they hung wet reeds in the walls. It was the first air conditioner with a water cooling system!



15. Fans were invented by the Chinese.

The Chinese discovered that moving air has a cooling effect on the skin about 3000 years ago, and they developed a useful little device to generate moving air: the handheld fan. This is the world’s first portable air conditioner! Someone even made a rotary fan that was operated by hand. Fans are also an essential part of almost every air conditioning system today.



16. Cooling towers were invented by Middle Eastern architects.

Towers constructed over underground cool air channels were popular in traditional Middle Eastern building design for larger spaces. The towers were designed to capture and disperse cool breezes, as well as to pull cool air up from underground channels while forcing warm air out. While we have streamlined the idea to use cool water, large buildings are still cooled using “cooling towers.”



17. The Victorians were well-versed in the subject of air movement.

The Victorians were masters of both artistic and practical design. They were known for their rigid codes of conduct, but they were also masters of creative and practical design. They were well-versed in the use of airflow to increase comfort. High ceilings, covered porches to keep the sun out, and wide recessed windows for cross ventilation were all part of the plan. Airflow is still one of the most important components of today’s air conditioning systems for maintaining a cool and comfortable environment.



18. Ducting mechanisms were invented by the Ancient Greeks and Romans.

The Romans stepped up the game with their hypocaust scheme after the Ancient Greeks invented the concept of central heating and cooling using water piped from aqueducts. Mosaic tiled stone floors backed by columns could be found in their luxurious villas and public bathhouses. The room underneath was used to move heated air to warm the space, similar to how modern HVAC systems use ducts to transport heated and cooled air to the spaces that need it.



19. After WWII, air conditioning became something of a status symbol. 

In 1953, over one million window units were sold due to their popularity.



20. In certain parts of the United States, air conditioning resulted in a population increase. 

Before air conditioning made areas like Arizona, Nevada, Florida, and Texas more attractive, the nation’s booming economies were largely concentrated in the Northeast.

21. The basic idea is that a chemical called a refrigerant loop from inside to outside and back, trapping and releasing heat in the process. 

The refrigerant cools before returning to the house and restarting the cycle.



22. Routine maintenance is important for keeping your air conditioner in good working order.

During the cooling season, it is recommended that you clean and/or replace the filters once a month.



23. The need to preserve foods prompted the invention of air conditioners in the early days. 

Foods that are held at room temperature are prone to spoilage due to bacterial growth.



24. When the principles of absorption refrigeration were discovered in 1824, it was discovered that liquefied ammonia could chill air when allowed to evaporate. 

In the year 1842, a physician named John Gorrie used compressor technology to produce ice.



25. In Montreal, Canada, the Montreal Protocol is signed to protect the earth’s ozone layer.

The Protocol specifies international collaboration in the phase-out of ozone-depleting compounds, such as CFC refrigerants used in HVAC equipment.



26. The use of CFC and HCFC refrigerants causes ozone layer loss in our atmosphere, allowing harmful rays to reach our planet. 

To substitute refrigerants like R-11, R-12, and R-22, newer ozone-safe refrigerants have been created. In newer air conditioning systems, non-ozone-depleting refrigerants like R-410a have been used.



27. The HVAC industry has started to produce a wide range of high-efficiency equipment. 

By using high-efficiency motors and increasing the heat exchange surface area, most air conditioning systems have reduced their energy consumption.



28. The SEER rating of an air conditioner indicates its performance. 

A device with a SEER of 13 consumes approximately 2,308 watts of energy per hour, while one with a SEER of 16 consumes only 1875 watts.



29. In recent years, AC compressors have advanced greatly, providing yet another way to improve comfort and performance when cooling the home. 

Compressors have only had one mode in the past. This feature may be turned on or off. The compressor pumped cooled air around the house while it was working.



30. Since a two-stage compressor has two speeds to choose from, you can operate it at a lower speed when you don’t need as much cooling.

This will also help to lower the temperature in the house, but it will do so by using less energy and giving the homeowner more control over the temperature.

31. The Chinese built a massive fan with a diameter of ten feet in the second century. 

Wealthy members of the dynasty relaxed in the dim, spa-like room with the giant fan and cool air, driven by servant’s muscle.



32. President James Garfield was assassinated in the summer of 1881. 

Engineers devised a makeshift air conditioner to keep him cool in an effort to alleviate his pain. They blew air over wet cloth-wrapped ice blocks. It was easy, but it was enough to keep Garfield alive for nearly 11 weeks.



33. On a typical day, New York City consumes approximately 10,000MW per second.

During a heatwave, the number will rise to over 13,000MW.



34. Carrier realized that extracting heat from the factory air would minimize humidity, so he borrowed technology from the fledgling refrigeration industry to produce what was, and still is, basically a hacked-up refrigerator. 

Air conditioning systems operate by inhaling warm air, moving it over a cold surface, and exhaling cool, dry air, just as they do now.



35. Air conditioning was first introduced in the House of Representatives in 1928, followed by the White House and the Senate in 1929. 

However, most Americans only experienced air conditioning during this period in locations like theaters or department stores, where it was seen as a pleasant novelty.



36. By upgrading your computer to “greener” technology, you can save energy and money. Heating and cooling account for almost half of the average family’s energy costs, which total nearly $2,000 a year. 

The Environmental Protection Agency (EPA) encourages homeowners to keep their homes cool by using energy-efficient cooling solutions. What exactly is the good news? These changes would allow you to save money.



37. Air conditioning is a lifesaver. 

According to American experts, the risk of dying on excessively hot summer days has decreased by more than 80% in the last 50 years. The rise in air conditioning was linked by the research team.



38. In 1939, Packard introduced the first car with air conditioning as an option. 

It was not very efficient due to its high cost and the fact that the evaporator and blower system took up half of the trunk space.



39. Electric fans were the forerunners of today’s air conditioning. 

Fans don’t literally cool the air; instead, they provide a “wind chill effect” by evaporating sweat and decreasing the body temperature.



40. As air conditioning became more widely available in the early 1900s, movie theater owners invested in air conditioning systems to keep seats filled on the hottest days of the year. 

Since most people didn’t have air conditioning in their homes, going to the movies was a great way to unwind. The term “refrigerated air” was often used in theater ads.

41. In 1903, the New York Stock Exchange Building in New York City was one of the first buildings in the world to use air conditioning. 

The machine, which was in operation for 20 years, was a 300-ton Alfred Wolff comfort cooling system.


42. Many homeowners overlook ventilation and temperature control.

High ceilings, sleeping porches, breezeways, and transoms are no longer essential features for homes and other buildings to withstand the summer because of air conditioning. Unfortunately, missing any of these steps can be very inconvenient, especially if your air conditioner breaks down.



43. Charles Gates designed the first completely air-conditioned home in a Minneapolis mansion in 1913. 

Regrettably, he died before he had the opportunity to experience it.



44. Heat resistance is reduced by using an air conditioner.

According to studies, as a person spends more time in an air-conditioned environment, his natural tolerance for heat decreases. So it’s no surprise that when we leave the mall or some other air-conditioned place, the feeling of heat doubles.



45. Air conditioners are capable of much more than just cooling the air. 

They often remove moisture from the air, making it more comfortable. Set your thermostat fan to “off” rather than “on” all day. Instead, choose the “auto” setting, which will only blow air while the cooling system is operating. Moisture would be blown back into the house and affect the humidity levels if you keep the fan on all the time.


46. In the 1940s, a simple air conditioning unit would cost about $350. 

You’d have to spend about $3,500 in today’s dollars if you adjusted for inflation.



47. The word “Summer Blockbuster” was coined thanks to air conditioning systems. Movie theaters were one of the first companies to adopt air conditioning technology in the early twentieth century. 

Patrons flocked to movie theaters in the 1930s not only to enjoy the films but also to enjoy the cool air during the summer months. Marketers took advantage of this pattern and held off on releasing their major hits until the summer. As a result, the word “Summer Blockbuster” entered our lexicon.



48. On a hot summer day, a portable air conditioner could appear to be the ideal solution.

They’re compact, quick to switch from room to room, and much less expensive than a built-in air conditioner.


49. Air conditioners that are portable are not light. 

On one level, they are normally in heels, which makes moving them relatively straightforward. If your home has two floors, however, they will be difficult to transport up and down the stairs.


50. Air conditioning can help avoid heat stroke, dehydration from excessive sweating, and other hyperthermia-related problems in hot weather. 

In developing countries, heat waves are the most dangerous form of weather. In hospital operating rooms and other areas where a clean, dry, hypoallergenic atmosphere is vital to patient safety and well-being, air conditioning (including filtration, humidification, cooling, and disinfection) can be used to provide a clean, safe, hypoallergenic atmosphere.

51. Passive air conditioning buildings are usually less costly to install and maintain than buildings with traditional HVAC systems that use less electricity. 

Although passive methods can achieve tens of air changes per hour and cooling of tens of degrees, site-specific microclimate must be considered, complicating building design.


52. In dry, hot climates, the evaporative cooling effect can be achieved by putting water near the air intake so that the draft draws air over the water and into the shelter.

As a result, in the architecture of humid, arid climates, the fountain is often compared to the fireplace in the architecture of cold climates.


53. In 1933, the first car air conditioning systems became available for purchase. 

Automobile manufacturers started looking for ways to incorporate air conditioning into their vehicles.



54. Mitsubishi Electric and Toshiba in Japan sold the first mini-split systems between 1954 and 1968. 

The small size of the homes prompted its growth.



55. Daikin developed multi-zone ductless systems in 1973, and VRF systems (which can be thought of as larger multi-split systems) in 1982.

Both of these items were first sold in Japan.


56. The compressor operates during the dehumidification period of most modern air conditioning systems. 

Slowing the fan lowers the evaporator temperature, allowing more water to condense.


57. Refrigerants have wreaked havoc on the world and continue to do so.

Ozone depletion and climate change are among them, as many countries have yet to ratify the Kigali Amendment, which aims to minimize hydrofluorocarbon consumption and development.


58. Passive air conditioning buildings are usually less costly to install and maintain than buildings with traditional HVAC systems that use less electricity.

Although passive methods can achieve tens of air changes per hour and cooling of tens of degrees, site-specific microclimate must be considered, complicating building design.


59. Ding Huan of the Han Dynasty invented a rotary fan for air conditioning in the 2nd century. 

It has seven 3 m (10 ft) diameter wheels that are manually operated by inmates.


60. Air conditioners enable the indoor climate of a building to remain relatively constant, despite changes in external weather and internal heat loads. 

They also allow for the construction of deep plan houses, allowing people to live easily in hotter climates.

61. Dr. John Gorrie installs an ice-making system at the Florida hospital where he works, which compresses ice into buckets and then blows air over them. 

In 1851, he patented the idea, envisioning his invention as a way to keep buildings cool all over the world. His dream, however, fades away without financial backing.



62. Stuart Cramer is the first to coin the term “air conditioning” to describe this operation. 

He is a North Carolina textile mill engineer. He invents a system that adds water vapor to the air of textile plants. Humidity makes spinning yarn faster and less likely to split.



63. Packaged air conditioners (also known as self-contained units) are central systems that combine all of the components of a split central system into a single housing and distribute air to the spaces to be cooled, likely viaducts.

They can be outdoors or indoors, on roofs (rooftop units), draw air to be conditioned from inside or outside a house, and be water, refrigerant, or air-cooled, depending on their design. Outdoor units are often air-cooled, while indoor units are frequently water-cooled using a cooling frame.



64. When central air is mounted, window units lose their cool points. 

A condenser, coils, and a fan make up the units. Air is drawn into a home’s ventilation system, then passed over coils and blasted. The refrigerant used is R-12, also known as Freon-12.



65. By 2019, the United States plans to “start phasing out the development and use” of hydrofluorocarbons (HFCs). 

HFCs are organic compounds that contribute to global warming and are often used as refrigerants in air conditioners.



66. Smart thermostats attach to your tablet or smartphone, allowing you to control your home’s temperature from anywhere in the world. 

Programming a smart thermostat to automatically adapt to your personal preferences takes just a few minutes.



67. With a smart thermostat, you can configure your air conditioner to keep your home at a warmer summer temperature while you’re at work.

Smart thermostats attach to your tablet or smartphone, allowing you to control your home’s temperature from anywhere in the world. Programming a smart thermostat to automatically adapt to your personal preferences takes just a few minutes.



68. Ice-powered air conditioning uses a thermal battery to reduce the cost of cooling a home or building. 

The thermal battery fills with water and freezes into a dense block of ice throughout the night. The ice block is used to keep the building cool throughout the day. Since ice-powered air conditioning reduces the need to use the air conditioner’s compressor, it uses less energy and lowers utility bills.



69. Although the upfront costs of a solar-powered air conditioner are normally higher than those of a conventional air conditioner, solar-powered air conditioning has the potential to save money over time.

Solar-powered air conditioners harness the sun’s energy using rooftop panels. Solar energy is then used to power the HVAC system of the building. 


70. Recyclable ductwork is made of triple-walled cardboard that has a fire-retardant, waterproof veneer applied to it. 

It’s 20 percent less insulated than conventional sheet metal ductwork and is stronger and lighter.

71. 3D printed air conditioners can become commonplace in the future, despite their rarity today.

With rapid advancements in 3D printing technology over the last decade, it’s not unreasonable to expect 3D printed air conditioners to become more popular in the coming years.



72. Wearable technology is a novel way for HVAC technicians to easily and effectively inspect and service air conditioning systems.

Although there are many different types of wearable devices, eyeglasses are one of the most common. If HVAC technicians need help when servicing a machine, these wearable devices give them real-time access to off-site experts, allowing them to diagnose and repair problems faster.



73. Many homes do not have working air ducts. Previously, this meant that homeowners had to rely on window air conditioners and portable air conditioners to keep cool. Today, however, you have the choice of going ductless!

Indoor air handlers in a ductless system are installed high on the walls of various rooms in the building. Consider these to be the vents of a traditional air conditioner/furnace, but with the addition of a blower, coil, and other critical components.



74. Geothermal air conditioning and heating uses the earth’s heat energy to heat and cool your home through an underground system (along with some familiar above-ground components). 

As compared to the temperature outside your house, the temperature underground remains relatively stable. As a result, it is a dependable source of heat energy for both the heating and the thermodynamic cooling process.


75. By 2009, 87 percent of American households had some kind of air conditioning. 

Despite the fact that air conditioning has offered much-needed relief from hot, humid summers, pollution from current air conditioners poses a danger to an ever-warming atmosphere. This translates to about 100 million tons of CO2 emitted into the atmosphere per year.



76. If the surface of the evaporator coil is slightly colder than the dew point of the ambient air, air conditioning equipment can decrease the absolute humidity of the air processed by the device.

In an occupied room, an air conditioner built for that space can normally achieve a relative humidity of 30% to 60%.


77. Packaged terminal air conditioners (PTACs), through-the-wall air conditioners, and window air conditioners all work in the same way. 

In cold weather, PTAC systems can be modified to provide heating, either directly with an electric strip, gas, or other heaters, or indirectly by reversing the refrigerant flow to heat the interior and draw heat from the outside air, effectively turning the air conditioner into a heat pump. They can be mounted in a wall opening with the use of a special sleeve on the wall and a custom grill that is flush with the wall, or they can be installed in a window without the use of a custom grill.



78. MIT engineers have devised a modern air conditioning system that employs sensors attached to aluminum rods suspended from the ceiling. 

These sensors are then activated by movement. To put it another way, the air conditioner just turns on when there are people present.



79. Thermally powered air conditioning is another design that has recently been introduced.

Chromasun, an Australian company, has developed a low-cost alternative to conventional air conditioners. It isn’t yet a commonly used technology, and it will be years before this type of design is widely available in the United States. Thermally powered air conditioning, on the other hand, is a highly versatile and powerful device that uses solar energy and is supplemented by natural gas.


80. Because of its lower energy usage and environmentally friendly refrigerant, the DeVAP device is gaining popularity. 

DeVAP, which stands for desiccant enhanced evaporate, is an evaporative cooling device in which water is poured into a honeycomb media and a fan blows through it, allowing the water to evaporate. The desiccant material absorbs humidity from the cooled air, resulting in dry air and a cooling sensation close to that of a conventional air conditioner.

81. HVAC equipment will last 10-15 years if properly maintained, so maintenance is a big part of the HVAC industry. 

The maintenance process can be simplified to be more reliable and environmentally friendly with the use of modern technologies.



82. Air conditioning was not widely available in 1931, and only the richest people could afford individual room air conditioning. 

H.H. Schultz and J.Q. Sherman came up with the idea for these units, which sat on a window ledge and cost between $10,000 and $50,000. That’s the difference between $120,000 and $600,000 in today’s money!



83. In a home with air conditioning, shades and blinds are your best friends. 

The explanation for this is simple: light is heat, and sunlight streaming in through your windows will gradually raise the room’s temperature. As a result, your air conditioners will have to work harder to keep the rest of your house cool, putting more strain on the machine. Make sure the blinds and curtains are closed on the next hot day when the sun is shining down.



84. In the early 1900s, the first electric air conditioner circulated air through water-cooled coils. 

This was not created with the intention of providing human comfort. Rather, it was created to improve the image quality by controlling humidity around a printing press.



85. Chromasun, an Australian manufacturer, is working on chillers that run on gas and solar panels and are extremely energy efficient. 

There are fewer moving pieces, so there are fewer chances of failure.



86. Growing government support in the form of higher budget allocations aimed at increasing homeownership and sustainable community development, as well as rising housing affordability, will help to fuel the sector’s growth. 

Furthermore, increased construction activities, rapid urbanization, infrastructural improvements, and HVAC unit replacements are some of the major factors driving the country’s HVAC services industry.



87. The HVAC industry in the United States is moving toward smart technology, thanks to a high degree of IoT integration in the field. 

The market for HVAC services in the country is also governed by state policies and regulations. According to Aeroseal, LLC, furnaces in the northern US must have a 90 percent efficiency rating, but only an 80 percent efficiency rating is expected in the southern states. This suggests that local and regional regulations drive the HVAC services industry.



88. All new residential central air-source heat pump systems and air-conditioning sold in the United States will be expected to meet new minimum energy efficiency requirements and standards beginning in 2023. 

The most recent minimum energy efficiency standards for these equipment types took effect in 2015, and for the first time, separate standards were established for cooling central air conditioners sold in the southern and northern sections of the United States. The new regulations maintain different cooling efficiency standards for air conditioners in the south, as well as requiring all air-source heat pumps to improve their heating efficiency.



89. Many buildings have an overall HVAC system that serves them, but there are troublesome areas that have different time and temperature specifications. 

Zone the system by adding different time and temperature controls for specific areas – zoned areas will have better conditions because inhabitants have more control over their respective environments. It’s also a good way to save money on electricity because HVACs in unused or unoccupied zones can be switched down or off.



90. The adoption of HVAC equipment has increased as a result of factors such as technological advancements and climate change. 

The demand for air conditioning equipment has risen as a result of global warming, which has resulted in shifting and erratic weather conditions.

91. The construction sector’s productivity in the United States is projected to reach USD 1.58 trillion by 2028, according to the Bureau of Labor Statistics. 

The increased need to build and maintain the energy efficiency of existing systems is expected to drive substantial demand growth for HVAC services.



92. Variable speed heat pumps, according to an Aeroseal survey, can save homeowners up to 40% on their monthly energy bills. 

By itself, proper insulation for a building or home will increase HVAC efficiency by up to 30%.



93. Engineer Henry Galson went on to create a more portable, low-cost window air conditioner and set up production lines for a number of companies.

By 1947, 43,000 of these devices had been sold, allowing homeowners for the first time to experience air conditioning without having to invest in costly upgrades.



94. Carrier publicly unveiled a new model of centrifugal chiller machine in May 1922 at the Rivoli Theater in New York, which had fewer moving parts and compressor stages than existing systems. 

The revolutionary device improved the efficiency and cost of large-scale air conditioners, allowing them to be used more widely throughout the world.



95. In 1929, Frigidaire launched a new split-system room cooler that was small enough for home use and shaped like a radio cabinet, based on refrigeration technology. 

The machine, however, was bulky, costly, and required a separate, remote-controlled condensing device.


96. General Motors’ Thomas Midgley, Albert Henne, and Robert McNary developed chlorofluorocarbon (CFC) coolants, which were the world’s first non-flammable refrigerating fluids, significantly enhancing air conditioner safety. 

However, decades later, the contaminants were related to ozone depletion and were gradually phased out by governments all over the world following the Montreal Protocol in the 1990s.



97. Manufacturers of residential central air conditioners and heat pumps have been subject to Energy Department conservation requirements since 1992.

From 1993 to 2023, the initial standard is estimated to save around $29 billion on energy bills. From 2006 to 2035, the standard is expected to save about $70 billion in electricity bills and prevent more than 369 million metric tons of carbon dioxide emissions, which is equal to the annual greenhouse gas emissions of around 72 million vehicles.



98. Since 1947, air conditioners have become smaller and less expensive. 

There were 43,000 systems in use that year.


99. The St. Louis World’s Fair organizers used mechanical refrigeration to keep parts of the Missouri State Building that hosted fair activities cool in 1904. 

It was capable of moving 35,000 cubic feet of air per minute and provided the public with the first taste of comfort cooling.


100. William Carrier patented his “Apparatus for Treating Air,” which used cooling coils to either humidify or dehumidify the air using hot or cold water. 

He tested his technology, then designed and patented an automatic control device for textile mills that regulated humidity and air temperature.


101. Evapolar, a Cyprus-based company, has released what it calls “the world’s first personal air cooler.” 

It’s a small cube with a water tank and a fan that purifies the air while creating a breeze. Evapolar advocates the concept of a “microclimate” designed to cool a single person’s work or sleeping area, rather than cooling whole rooms or buildings, to save electricity.

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