How Much Do You Know About HVACs? – 101 Intriguing Facts About HVACs in 2021

Did you know that electricity to power America’s AC units costs more than $11 billion per year? Wow!! That’s amazing! We know finding facts and figures about HVACs and AC units 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!

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


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


2. Movie theaters were among the first businesses to use air conditioning, even as the Great Depression was in full swing.


Explanation: In order to keep people cool over the summer, theaters started releasing their biggest films during the summer months, resulting in the ever-popular “summer blockbuster.”


3. 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.


4. Until the 1960s, the Northeast was the United States' economic powerhouse.


After air conditioning became widespread, populations grew in states like Arizona, Florida, and Texas, and the South now accounts for 60% of our economic development.


5. Homes and buildings were built with high ceilings, breezeways, sleeping porches, landscaping to create shadows, and other features to keep people 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).


6. People who live in hot or cold climates may prefer a single-stage system that only produces heating or cooling.


These are usually less costly, but they are also unreliable, and they will typically operate at full capacity even when it is not needed.


7. Variable fan speeds will be available on more advanced models to minimize power consumption.


When compared to multi-stage systems, they remain unreliable and, as a result, are more expensive to operate in the long run.


8. Zoned heating and cooling systems, on the other hand, are designed to heat or cool particular areas of your house.


This is accomplished by incorporating zone valves and dampers into the vents and ductwork to selectively obstruct air flow. This is of immeasurable benefit to those with larger properties because it stops the device from heating or cooling parts of the house that are not in use.


9. Humidity control can be integrated into HVAC systems, and humidifiers and dehumidifiers can be applied to heating and cooling systems as options.

Mesa Arts Center building in downtown Mesa
By Cygnusloop99 - Own work, CC BY-SA 3.0,
INFOGRAPHIC - Fresh Breeze Heating and Cooling - How Much Do You Know About HVACs - 101 Intriguing Facts About HVACs in 2021

These additions to the system are important for people who live in very dry environments or in the tropics. As a result, some people tend to install separate humidifier or dehumidifier systems in order to control the humidity in their house without having to switch on the air conditioner.


10. Heating systems come in a variety of shapes and sizes.


Some are furnaces that burn materials to provide hot air through ductwork, while boilers that heat water for steam radiators, or forced-water systems with baseboard radiators, electric heat, and heat pumps are also common options. A furnace uses natural gas or propane to heat the air, while a boiler uses gas or oil to heat the water.


11. A radiant floor, also known as a hydronic heating system, is another choice.


These are made up of flexible tubes that are filled with water or a glycol solution and run underneath the surface. This can heat any type of floor, including concrete, and are a cost-effective way to keep a home warm. They can also be retrofitted into wooden flooring, but they must be mounted carefully in wooden floor sheathing.


12. Many air conditioners, like ductless mini split systems, may be mounted by the user.


The interior and exterior elements of the system must be properly connected during installation, but they are relatively inexpensive to purchase and operate.


13. Evaporative coolers are a common option in dryer climates.


They bring in outside air and move it through water-soaked mats, which cool and moisten it before pushing it into the living space and displacing the hot air.


14. The home would never be comfortable if the ducts aren't correctly sized and balanced.


Long runs of flexible duct are the least effective; externally insulated round ducts are the most efficient.


15. The thermostat is the most noticeable component of your HVAC system, and it's also the one you'll use the most.


It can be adjusted manually and configured to keep your home at your preferred temperature and is usually mounted on easily accessible walls. The thermostat activates your HVAC system to circulate air as required when the ambient temperature becomes too hot or cold.


16. Your furnace is the main attraction of your HVAC system, and it can be very large—it will take up the most space of all the other components.


The furnace heats air, which is then spread through ductwork or piping to various parts of your house. Solar energy, heat pumps, electric resistance, and combustion are all used as heat sources in furnaces.


17. The vents in your home help distribute heated and cooled air from the duct system to the different spaces.


They're usually near the ceiling and have angle slats that guide air downward. It's important that these vents stay clear.


18. When the thermostat is set to a lower temperature, the evaporator coil is used to cool the air.


This colder air is then distributed around your household.


19. The condensing device is located on the outside of your home and is loaded with refrigerant gas.


The condensing device pumps the liquid refrigerant to the evaporator coil, where it is converted back into steam.


20. By regulating valves or dampers inside the ductwork, zoned systems allow you to cool or heat different areas of your home.


These dampers are used to obstruct airflow selectively. Since zoned air systems allow you to monitor which areas are heated or cooled at particular times, they can save you a lot of money.


21. Refrigerant lines transport refrigerant in the form of gas to the condensing unit.


This gas is converted to a liquid and then returned to the evaporator coil.


22. Most modern systems have humidity control as an option. Depending on your environment needs, humidifiers and dehumidifiers may be added.


When your HVAC system is on, these systems allow you to automatically monitor the humidity levels in your home. Humidity, as well as high temperatures, can be a concern in certain parts of the world.


23. Bigger isn't always better, particularly when it comes to HVAC systems. 


Don't buy a bigger unit than your house needs. The machine can cycle through its rounds too fast if it is too heavy for the amount of square footage it is cooling. Excess condensation, mold, rot, and, of course, reduced comfort are all possible outcomes. Request assistance from your contractor in assessing the correct sizing.


24. Evaporative cooling is, without a doubt, the most essential type of air conditioning.


People in Ancient Egypt kept cool by hanging water-soaked reeds on window sills to keep cool in the sun. When the wind blew, the water would evaporate, making the air in the room much colder.


25. Despite the fact that Willis Carrier invented the first air conditioner, the word "air conditioning" was not given a name until 1906.


After technology improved the quality of the fabric being manufactured in the factory, a textile manufacturer in North Carolina coined the word. It's a lot easier to recall than the patent title for one of the first modern air conditioning systems, which was "An apparatus for handling the air."


26. John Gorrie's machine was brought to life in 1902, and Willis Carrier built a real air conditioner for a publishing firm in Brooklyn where he worked.


He designed it to keep the temperature and humidity low enough to prevent the paper from shrinking or growing too far. However, it was not until much later in history that this computer became a commonly accessible device for every home and building.


27. Despite the fact that Willis Carrier invented the first air conditioner, the word "air conditioning" was not given a name until 1906.


After technology improved the quality of the fabric being manufactured in the factory, a textile manufacturer in North Carolina coined the word. It's a lot easier to recall than the patent title for one of the first modern air conditioning systems, which was "An apparatus for handling the air."


28. Gorrie had the brilliant idea of using air conditioning to keep his patients comfortable.


Hospitals with air conditioning also aided in the prevention of many illnesses and also saved lives. Malaria elimination, surgical advancements, bacterial inhibition, and lower child mortality rates are only a few examples.


29. In 1914, the first home air conditioning system was installed.


It stood 7 feet tall, 6 feet wide, and 20 feet long.


30. Only rich people with large homes could afford air conditioners due to their size and expense.


Systems range in price from $10,000 to $50,000, which equates to $120,000 to $600,000 today.


31. The use of ancient methods was not limited to Egypt.


For the purpose of keeping cool, ancient Rome circulated their water from the aqueducts through the walls of some buildings.


32. The majority of people first encountered artificially cooled air in movie theaters.


Indeed, “Refrigerated Air” was commonly listed in theater ads in order to entice ticket buyers seeking relief from the sun.


33. Summer holidays, as we know them, were developed in response to the hot summer months.


Since the school buildings were so hot, the break allowed students and teachers to escape the season's hottest days.


34. Schools weren't the only places that closed for the summer; government departments did as well.


Some historians attribute the growth of the federal bureaucracy to the availability of air conditioning, which enabled legislators to hold longer sessions.


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


Window units were so common in 1953 that over one million were sold.


36. Making sure your house is well heated is the most effective way to save energy without changing your heating system.


By covering window and door openings, you can save more than 25% on your energy bill. Your heating or cooling machine spends less time adjusting the temperature of your room and more time preserving the climate of the room by sealing air in.


37. Air conditioners were too massive and costly for homes until 1931.


The first air conditioners stood over six feet tall, were as large as they were tall, and were about 20 feet long. Certainly not suited to the average window ledge. Making air conditioners small enough for daily usage needed the invention of two inventors called H.H. Schultz and J.Q. Sherman. It's worth noting that these early models were also considerably bigger and heavier than current models.


38. In 1977, advances in the HVAC industry enabled air conditioners to also hold heat pumps inside the same machine, resulting in a revolution in the industry.


Since then, we've been able to buy a single unit that satisfies both our heating and cooling requirements.


39. The most common cause of HVAC failures is dirt and dust accumulation, which makes sense when you consider that only 1 millimetre of dirt on your unit's heating and cooling coil will reduce output by more than 20%.


This reality emphasizes the value of routine maintenance and the purchase of dependable filters.


40. Huge data centers will be unable to store processors without air conditioning systems, and the internet would not operate as it does today.


The medical and pharmaceutical industries will be unable to protect perishable samples without the use of cooling machines. When extreme weather became less of a barrier for working in hot areas, whole parts of the world were able to prosper. Heating, ventilation, and air conditioning are now critical components of business performance.


41. The Rivoli Theater in Time Square was the first company in the twentieth century to use air conditioning. 


The use of air conditioning was a significant factor in the growth of movie theaters as a business enterprise. People went to the cinema in the 1930s not only to see movies, but also to cool off in the summer sun. The term "summer blockbuster" was coined as a result of this, and advertisers took advantage of it by releasing more films during the summer months.


42. It's important to replace your air filters on a regular basis to maintain clean air and maximize the performance of your HVAC system.


The accumulation of dirt in the air filter is one of the most common causes of HVAC failure. A clogged air filter has a variety of negative consequences. Its primary role, however, is to capture all dangerous airborne pollutants that endanger your health. When an air filter becomes clogged with dirt and debris, it can no longer work properly, and you can start breathing dirty air. Due to restricted airflow, dirty filters often result in an inefficient HVAC device.


43. In 2011, air conditioning was installed in approximately 88 percent of new single-family homes built in the United States. 


Compare that to the fact that in 2013, just 55% of Canadian households had air conditioning. It seems that the climate in Canada is naturally colder.


44. The word "Summer Blockbuster" was coined thanks to air conditioning systems. 


Movie theaters were one of the first companies to implement 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 launching their major hits until the summer. As a result, the word "Summer Blockbuster" entered our lexicon.


45. President Herbert Hoover was the first to use air conditioning. 


Just after the Great Depression began, he invested $30,000 to install the machine in the oval office.


46. 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.


47. 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, pick the "auto" mode, 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.


48. 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.


49. Packard launched the first car with air conditioning as an option in 1939.


Due to its high cost and the fact that the evaporator and blower system took up half of the trunk room, it was not very successful.


50. Air conditioning is a lifesaver. 


According to American experts, the probability 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.

51. You will save energy and resources by upgrading your device with "greener" technology. 


The average family spends nearly $2,000 on energy bills, with heating and cooling accounting for nearly half of that. The Environmental Protection Agency (EPA) encourages homeowners to use energy-efficient cooling options to keep their homes cool. What's the good news? These modifications will help you save money.


52. Since inventing the ice-making machine to provide fresh air for his patients, John Gorrie is regarded as the inventor of refrigeration and air conditioning. 


Later on, he imagined his ice-making equipment being used to cool buildings and houses. Gorrie was granted a patent in 1851, but he died penniless in 1855.


53. The architectural industry was greatly influenced by the invention of HVAC systems. 


To minimize heat and keep residents cool before air conditioners, architects built buildings and homes with breezeways, high ceilings, and shady landscaping.


54. Many of the drugs you take every day can be tested and improved thanks to air conditioners. 


To accurately study these revolutionary necessities, researchers need cool and less humid air in their laboratories.


55. People used to stay cool with big blocks of ice until the invention of the air conditioner. 


When air conditioners were first installed in 1902, their production ratings were determined by the amount of ice required to achieve the same cooling capacity.


56. Moving air feels cooler on the skin, so fans pump air. 


If a room is too hot, fans are an excellent way to cool it down – as long as someone is present. While fans generate wind, they have no effect on the temperature.


57. 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!

58. The Romans stepped up the game with their hypocaust scheme after the Ancient Greeks developed 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.

59. 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.


60. 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.


61. 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 air flow to boost comfort. High ceilings, covered porches to keep the sun out, and wide recessed windows for cross ventilation were all part of the plan. Air flow is still one of the most important components of today's air conditioning systems for maintaining a cool and comfortable environment.


62. A patent for a window A/C machine was filed by H.H. Schultz and J.Q. Sherman. 


The product was released in 1932, but it was not well received due to its high price. In today's market, the device will cost between $120,000 and $600,000.


63. Alice Parker of Morristown, New Jersey, received the first patent for the central heating system in 1919. 


In direct contrast to its predecessors, it allowed people to better monitor the temperature in their homes.


64. Almost half of the energy bill is expended on the boiler. 


While energy consumption varies by region, the US Department of Energy found that heating and cooling consumed 48 percent of the average home's energy. Although seasonal use can cause this number to fluctuate throughout the year, it is primarily the boiler that is to blame. The Department also discovered that if your heating system isn't working properly, up to 35% of the heat produced in your home is wasted.


65. The majority of boilers do not boil water. 


The boiler in your home constructed after 1950 does not boil water to produce heat. Even if your house was constructed before 1950, you may be able to upgrade your heating system to replace the steam boiler.


66. Brunswick Refrigerating Co. exhibits a self-contained mechanical refrigerator at the St. Louis World's Fair. 


It is a company that specializes in manufacturing small refrigerators for homes and butcher shops. The ammonia cooling system is built into the side of a wooden icebox refrigerator. Thousands of tourists to the World's Fair often get to see the Missouri State Building's air conditioning for the first time. The machine cools a 1,000-seat auditorium, the rotunda, and numerous other rooms with 35,000 cubic feet of air per minute.


67. The Boston Floating Hospital becomes the first air-conditioned hospital, with a device built by Edward Williams that keeps the hospital wards at about 70°F and 50% relative humidity. 


The thermostats in each of the hospital's five wards are individually managed. Williams' device uses "reheat," which involves slightly heating cooled air to reduce humidity.


68. The Congress Hotel in Chicago has air-conditioning equipment engineered by Frederick Wittenmeier installed in the dining and meeting rooms. 


This was one of Wittenmeier's first programs for hotels and movie theaters. Hundreds of cooling plants are constructed by his company, Kroeschell Brothers Ice Machine Company, until the 1930s.


69. In Chicago, Fred Wolf, Jr. sells the Domelre (Domestic Electric Refrigerator), an air-cooled, electric, self-contained household refrigeration unit. 


The device is designed to be mounted on top of any icebox and operates on a thermostat. The Domelre was the first household refrigerator to include ice cubes, and unlike other household refrigerators that require water, it uses air to cool the condenser.


70. Nizer and then Frigidaire both sell an electrically refrigerated ice cream dipping cabinet. 


The alcohol-based antifreeze that surrounds ice cream cans put in wells in the cabinet is cooled by a refrigeration system. Later, salt brine is used to replace the alcohol.


71. In the United States, gas-fired household absorption refrigerators that do not need electricity are marketed to rural areas. 


One, the Electrolux, which has been sold in Sweden since 1925, has become extremely popular.


72. The first refrigerator with a fully sealed refrigerating device is introduced by General Electric. 


The refrigerator, nicknamed "The Monitor Roof" because of its distinctive round refrigerating device that resembles the gun turret of the Civil War ironclad ship Monitor, is manufactured for the next ten years and is so reliable that thousands are still in use today.


73. Thomas Midgley, Albert Henne, and Robert McNary of the General Motors Research Lab synthesize chlorofluorocarbon (CFC) refrigerants for Frigidaire. 


CFCs, which were first officially announced in 1930 and trademarked as Freon, are the first nontoxic and nonflammable refrigerating fluids, allowing refrigerators and air conditioners to be used safely.


74. The first room cooler is released by Frigidaire. 


The one-ton (12,000 BTUH) refrigeration unit is designed to be installed outside or in the basement and uses sulfur dioxide refrigerant.


75. The "Hot- Kold" year-round central air-conditioning device for homes is sold by Frigidaire. 


Several manufacturers built central air conditioners for homes in the early 1930s, a market that steadily expanded until the 1960s, when lower prices made it affordable for many new homes.


76. In its Los Angeles office house, Southern California Edison Company installs a heat pump air-conditioning system. 


Since a refrigeration device transfers heat from one location to another, the same concept may be used to eliminate heat in the summer or add heat in the winter by constructing a reversible system.


77. For $274, Packard Motor Car Company provides an automobile with air conditioning as an option. 


The refrigeration compressor is operated by the engine, and there is no thermostat in the system. The cooled air is discharged from the rear of the engine.


78. Engineer Henry Galson's inventions allow mass-produced, low-cost window air conditioners, which he sets up production lines for a variety of manufacturers. 


In 1947, the United States sold 43,000 window air conditioners. Many homeowners will now experience air conditioning without needing to purchase a new home or renovate their heating system for the first time.


79. An earth circle, or a system of underground pipes, is used in geothermal HVAC systems.


The temperature in the ground below 6-feet is more constant than the temperature above ground, which varies throughout the year. Water flows into these underground pipes, which are heated or cooled by the ground temperature depending on the time of year. This water is then routed to an indoor unit, where a fan, pump, and compressor are used to circulate temperate air in the home or building.


80. The fact that DeVAP air conditioners do not use coolant chemicals means that they are less harmful to the environment.


Desiccant Enhanced Evaporative Process (DeVAP) is a relatively new type of air conditioning that has the potential to fully transform how we heat and cool buildings. DeVAP HVAC systems use an evaporative cooling system to trap water from the surrounding environment and provide cooling.


81. Solar HVAC systems use solar panels to harness the sun's thermal energy and heat a fluid, which then warms the building via a heat exchanger.


Solar energy is a smart way to produce clean energy for your air conditioner while still running the rest of your home's appliances. Solar panels will save you thousands of dollars in energy over the course of 25 years, outlasting your air conditioner and all the other appliances they fuel.


82. By 1980, Toshiba had introduced an inverter-type compressor air conditioning unit that improved efficiencies by 30%, kicking off a trend of producing systems that are not only powerful but also perform well.


An inverter's main function is to rapidly cool or warm a room to the desired temperature and then efficiently sustain that temperature. By varying the speed of the compressor in response to cooling demand, the inverter allows the device to continuously regulate its cooling and heating power.


83. The warmer climate in South Africa necessitates the use of air conditioning in commercial buildings. 


There is a wide variety of HVAC solutions for industrial buildings, just as there is for residential air conditioning. Variable-air-volume (VAV) systems with a rooftop unit, chillers with a cooling tower and boiler system, and water-source heat pump systems with a cooling tower and boiler system are examples of these.


84. The HVAC industry's numerous emerging developments today are based on device reliability and renewable energy sources. 


The movement toward being more environmentally friendly and effective has resulted in the development of new technologies to support this vision. As a result, many companies and businesses are replacing their energy-hungry systems with ones that are more productive and dependent on renewable energy sources.


85. Some aspects of preventative HVAC maintenance are easy to do. 


To keep things running smoothly, you must, for example, adjust the oil, belts, and filters on a regular basis. Following these measures, you can look for ways to improve performance by cleaning air-handler coils and boilers.


86. A cool bedroom makes it easier to sleep.


According to, the perfect sleeping temperature is between 60 and 67 degrees Fahrenheit. To start the sleep phase, the body's core temperature must drop, so keeping your bedroom a little cooler will help. If you suffer from insomnia, it's recommended that you sleep in a bed with a calm, consistent temperature.


87. Ventilation is beneficial to both your home and your health.


In a closed room, ventilation provides airflow. It essentially brings fresh air into your house. It can have a long-term effect not just on your home but also on your wellbeing, in addition to keeping your house from being stuffy. Since it controls the amount of moisture lingering in your house, ventilation prevents mold and bacteria growth. It may also assist in the removal of dust. Both of these elements will contribute to a cleaner home and a healthy lifestyle.


88. In the 1970s, central air revolutionizes air conditioning. 


A ventilation system is designed to operate with a condenser, coils, and a fan in a modern form of unit. It circulates heated and cooled air in the building. Freon, a new refrigerant, is made, ushering in a new era of residential comfort.


89. Propane can never be used as a refrigerant in an air conditioner.


The EPA expressly forbids the use of propane as an air conditioning refrigerant. This is due to the substance's high toxicity and flammability. It can cause significant harm if exhaled in large amounts, as well as house fires and explosions. It's difficult to substitute your refrigerant when it's poor. As a result, you should entrust it to a specialist. You can never use propane in any circumstances. Despite the fact that it is a gas, it is not ideal and can cause serious problems.


90. Freon has the potential to induce asphyxia.


If an HVAC technician ever found a Freon leak in your air conditioning system, freezer, or fridge, they probably warned you of the risks of being exposed to it. According to certain technicians, the leak will cause asphyxiation. However, it has since been discovered that this colorless, toxic gas can only cause adverse effects at concentrations of at least 11%. Difficulty concentrating, dizzy spells, heart arrhythmia, and nervous system depression are some of the side effects. True, Freon can cause asphyxia; however, this would only happen in extremely confined spaces.


91. Changing the filter on a regular basis makes the HVAC system last longer and operate more effectively.


The device must condition more air to meet heating and cooling needs as dust and other particles accumulate in the coil and other areas. The machine stays clean with a new filter.


92. The best infrared heaters can easily transfer their heat to a room and its occupants by using a small heating element.


An infrared heater is an electronic system that plugs into your wall and heats your room using infrared radiation. Most people are capable of warming a room without taking up too much space. In addition, older technologies such as oil-filled coil radiators can be found.


93. The longer you live in your current home, the more cost-effective high-efficiency water heaters become.


When equipment and maintenance costs are viewed together, a cheap electric or regular gas water heater will save you money if you're moving in three years or less.


94. Gas and propane water heaters are less costly to run than electric water heaters, but they are more expensive than solar and heat pump water heaters.


This also applies to tankless models: gas is more efficient. Fuel units, on the other hand, necessitate a gas line and venting. As a result, installation costs are often doubled. Gas is a safer long-term, cost-effective solution if you already have a gas line near the installation site. In addition, it heats water much faster than electric coils.


95. A large tankless gas unit that can serve the entire house is less costly than some smaller gas or electric tankless systems.


Whole-house units, on the other hand, are more expensive to run because hot water cools in the pipes, reducing productivity. And you'll have to run the water as you wait for it to heat up. In short, small units make sense if you only need water in one or two remote locations. A single large gas tankless heater is the best option for three or more places.


96. Because of the refrigerant's toxicity, you must exercise extreme caution while dealing with it.


If you inhale it, it may have serious health consequences. And if you're just testing or removing an older refrigerant, use gloves or a mask to protect yourself. It may be inconvenient, but it will only shield you from any negative effects.


97. Capillary action is caused by intermolecular forces that occur naturally between a liquid and a solid surface.


A capillary tube is a small, rigid tube made of plastic or glass that allows liquid to flow up it against gravity. The capillary motion is what triggers this. The tube's diameter determines how much the liquid rises. Surface tension is created by the inherent cohesion of water if the tube is small enough. Capillary movement happens as this tension is coupled with the adhesive forces of liquid vs. a hard surface, and water is forced forward.

98. Cleaning your air conditioner's coils is one of the most important things you can do to prevent it from breaking down as quickly.


It will pay off in the long run if you pay attention to cleaning the AC coils and you will be less likely to have to try to repair the system in an emergency situation when it is 90 degrees outside.


99. All and all on Earth benefits when you use less oil.


When the machine is running at full efficiency, it produces less exhaust and consumes less power.


100. A safe system is one that is properly operating.


Carbon monoxide poisoning or gas leaks may be fatal. In addition, in an unmaintained environment, there is a chance of burning.

101. There is still no fully eco-friendly refrigerant for air conditioning systems.


The Kyoto and Montreal Protocols established benchmarks and standards for the use of substances that cause greenhouse gas emissions and ozone depletion, respectively. This is the key reason why R-22 was phased out in the 1990s. It was discovered through studies that it was depleting the ozone layer. R-22 was phased out and replaced with R-134a. However, this Freon kind had its own set of problems. It is incompatible with the type of oil used in older systems. Also, R-12 is no longer made, and even when it was, the price rose from $89 for 30 pounds to over $1,000 for 30 pounds. R-22, which was once widely used in small commercial and residential schemes, was phased out in 2009 and is expected to be fully phased out by 2020.




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