Tag: conditioning

Is central air conditioning more energy-efficient than window units? #central #air #conditioning #problems


Is central air conditioning more energy-efficient than window units?

Is central air conditioning more energy-efficient than window units?

Global Cooling

For many urbanites, summer means being constantly dripped on from the air conditioners that fill virtually every city window. These ubiquitous boxes must consume a tremendous amount of energy. From an environmental perspective, aren’t central air conditioners better?

Not necessarily. Air conditioning accounts for more than 15 percent of the energy use of the average home—somewhere around 183 billion kilowatt-hours of electricity in the United States per year, according to a 2001 analysis by the Energy Information Administration. Generating that much electricity creates about 119 million tons of carbon dioxide, or roughly the amount of CO2 spewed by 20 million cars each year. Remarkably, the percentage of homes with central air more than doubled. from 27 to 55 percent, between 1980 and 2001.

When deciding on how to air-condition your abode, you have two basic choices: single-room units or a centralized system. Anyone who’s been to a big-box hardware store has seen the single-room air conditioners. They’re heavy, steel boxes designed to wedge into a window and dangle precariously over passing pedestrians. (In case you were wondering: Yes, they do fall on people .) Inside, there’s a condenser, an evaporator, a thermostat, and a couple of fans .

Central air conditioners have a different structure altogether. The condenser typically sits on the roof or in the backyard. A set of pipes runs coolant from the condenser into an air handler, which is usually located near the home’s furnace. The air handler blows the cooled air through the home’s duct system and into individual rooms.

A central air system’s energy efficiency is measured two ways. The more basic rating is the energy efficiency ratio, or EER, which describes the unit’s energy consumption while cooling a prescribed volume of 95-degree air over the course of an hour in a specialized laboratory. The seasonal energy efficiency ratio, or SEER, is a bit more complicated and considers the average energy use at various temperatures and humidity levels.

Window units are rated only by EER, and lose out to central A/C by this metric. An Energy Star-certified central unit must have a minimum EER of 12. while window units only need to achieve between 9.4 and 10.7. depending on size, to be certified. (It’s possible to buy a window unit rated higher than this minimum, but the same goes for central units. Overall, the central units are still rated higher.)

One reason window air conditioners have lower ratings is that it’s impossible to fit much advanced hardware into that little box. While modern central air conditioners can work at a range of speeds, for example, the condensers in most window units only have two: on and off. (This is, incidentally, the primary reason window air conditioners don’t get SEER ratings.)

This can make a significant difference in energy use. Air conditioners not only lower air temperature; they also remove moisture. Just how much moisture is removed depends on how much air passes through the air conditioner. A machine that only works at full speed (or not at all) can drop a room’s temperature quickly by cooling just a small volume of air to an extremely cold state. In contrast, an air conditioner with variable speed settings can have the same effect by processing a larger volume of air, but cooling each unit volume by a smaller amount. The latter situation results in greater dehumidification because more air runs through the machine.

While this seems like a technical point, it’s quite significant, because it means users can set central air conditioners to a higher temperature and feel just as comfortable, because the air is less humid.

But the window units have their advantages, too. Central air conditioners suffer from “duct losses.” As cooled air passes through the system of ducts on its way to the rooms, it warms up and often leaks through the fittings. These losses can decrease an air conditioner’s energy efficiency by up to 30 percent.

Window units that block the sun from your room, buzz, and shake violently every time the condenser switches on are basically begging for attention—very few consumers walk out the door without remembering to shut off their window units. The quiet and unobtrusive functioning of central air conditioners, on the other hand, can lead to accidental overuse. Industry observers note that people tend to set their central air conditioner to a comfortable temperature and never change it.

Window units also offer room-by-room control. For singletons or couples who occupy only one bedroom at night, cooling a single room consumes a small fraction of the energy that a central air conditioner would.

Central air units are getting smarter, though, and accordingly more efficient. Programmable thermostats can make up for forgetful central A/C users by shutting the unit off when no one is home. Some central air systems even divide homes into separately controlled zones, so you don’t have to cool the kitchen at 3 a.m. just to keep your bedroom a sleepable temperature. And some new central air conditioners have an air handler in each room, skipping the ducts entirely, combining precise control with improved efficiency and less noise.

Because of the construction and behavioral variables, it’s impossible to pronounce a winner in this particular competition. As is often the case, the choice is often going to come down to each consumer’s behavior. Generally speaking, the newfangled ductless system is going to be the most efficient but priciest option upfront. If you’re choosing between an old-school central air system and window units, the latter could be better if you’re childless, live in a large home in a dry environment, or tend to be forgetful about adjusting your thermostat.

The Lantern thanks Jennifer Amann of the American Council for an Energy-Efficient Economy.

Click here to see a slide show of clever and humorous cooling systems.

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Air Conditioning Matthews, NC – McClintock Heating – Air Conditioning #matthews #Air #Conditioning


Air Conditioning

Are you looking for a reasonable and reliable air conditioning service, repair and installation company in the Matthews and Charlotte area? At McClintock Heating Cooling we do good work at a fair price, we arrive on time, in uniform, wearing a photo ID and we clean up before leaving. We not only provide you with superior products and the appropriate solutions for your air conditioning needs, but we also provide the very best customer service. We are family owned and operated heating and cooling company located in Matthews, NC with over 25 years of industry experience. Our technicians are NATE certified and EPA licensed and receive over 100 hours of annual on-going training. Regardless of your AC needs, we have technicians available 24 hours a day, 7 days a week. We offer a wide range of air conditioning products and services to meet your every need. Please contact us to inquire about how we can improve your existing home with our quality Trane products and services. Our products and services include:

A variety of air conditioning systems and equipment to fit your budget including:

  • Energy Efficient Cooling Systems
  • Central Air Systems
  • Air Conditioner Package Systems
  • Mini-Split Systems
  • Zone Systems
  • Variable Speed Systems

We service all makes and models of cooling systems with:

  • Expert troubleshooting and diagnosis
  • Freon Leak Detection
  • Fully stocked trucks
  • Billing by the JOB, not by the hour

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Aviation News-Aircraft Maintenance-Ground Support Equipment, frederick m jones air conditioning unit.#Frederick #m #jones #air #conditioning #unit


Top News

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Changi Airport: A Leading Air Cargo Hub

AsBAA Hosts Industry Leaders at Second CEO Series Luncheon

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Former East-West Bank President joins OIAA Commission

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NBAA to Accept Hurricane Relief Contributions at Morristown Regional Forum, Sept. 7

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Heavy Duty Vehicle Lift Leader Stertil-Koni Debuts Differential Adapter Specifically for its Telescopic Piston Lift, the DIAMONDLIFT

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Marketplace PHL Announces Chickie’s & Pete’s and Stellar News Named as Restaurant and Retailer of the Quarter

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Flying Blind: USHST Announces First Group of Proposed Safety Enhancements Aimed at Reducing Fatal Helicopter Accidents

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Duncan Aviation has 17 additional CJ3 aircraft scheduled for the upgrade over the next 18 months

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SUN n FUN/Aerospace Center for Excellence to Host Fifth Annual Classroom to the Sky

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XL Catlin Unveils Online Platform to Quote and Deliver Newly Enhanced Personal & Business Aircraft Insurance in the US

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SkyWest Inc. Announces Order of 25 New Aircraft, New Flying Agreements

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Certification Trials of Helicopter K-62 to Be Commenced in 2018

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Marsh Brothers Aviation (MBA): Announces New Director of Business Development

Nicholas Choo-Son appointed the new Director of Business Development for Marsh Brothers Aviation.

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Larson Air Conditioning #air #conditioning #mesa #az


Air Conditioning Heating Services

Whether it s service or repair call the experts at Larson Air!

At Larson Air Conditioning we re the locals choice for professional full service air conditioning and heating services. We are locally owned and operated here in Scottsdale, Arizona and serve the entire Greater Phoenix area. We offer expert service, repair and installations for every brand, every model, everyday! Our services are offered for both residential and light-commercial HVAC systems. With more than 30 years experience working with air conditioning systems we re best prepared to fix your problem. With our commitment to quality craftsmanship and our dedication to total customer satisfaction, we re the ac repair company that you can depend on. When you want it fixed right the first time, call the experts at Larson Air Conditioning.

Same Day Service

Same Day Air Conditioning Service Repair

We understand the urgency a homeowner requires after being subjected to a broken down HVAC system. That is why we offer same day heating and air conditioner service and repair. When you call to schedule a service request you will not wait a week or even a couple days, instead we will have your request posted to our schedule for same day service because we understand the urgency you require.

We come prepared! Our service trucks are fully stocked with professional grade parts which makes us best prepared to provide same day service and repair for all your heating and cooling needs.

Proven Industry Knowledge

How important is it to you that you get a technician with the knowledge to get the job done right the first time? Our service technicians have proven their knowledge in the heating and air conditioning field by passing specialized NATE certification tests. With this credential our service technicians are capable of providing superior installations, maintenances and repairs to your heating and cooling systems.

When using a certified NATE technician you ll benefit by:

  • Lower utility bills through proper installation and maintenance
  • Fewer callbacks and warranty returns
  • Fast, efficient service
  • Jobs done right the first time
  • Equipment that runs at peak efficiency
  • Advice and knowledge of certified technician
  • Greater peace of mind

100% Satisfaction Guarantee

When you choose Larson Air Conditioning, you re choosing quality craftsmanship, attention to detail, a commitment to higher quality customer service, and peace of mind knowing we have a 100% Satisfaction Guarantee. As a locally owned company we take pride in ensuring total customer satisfaction and follow the simple ethical standard of treat others how you want to be treated. Whether you need service or repair, choose the experts at Larson Air.

Call today toll free (480) 428-0600.

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Air Condition Compressor – Discount AC Parts #air #conditioning #compressor #replacement


Air Condition Compressor

High Quality AC parts only at Discount AC Parts:

100% genuine AC parts
All OEM and factory replacement parts
Wider phone and online support
Free Shipping on all orders
Toll free assistance on calling 1-800-398-3128

Air Condition Compressor is considered as the core part of any air conditioning system. In your vehicle’s air conditioning system, the Air Conditioning Compressor may sometimes get faulty due to heavy usage. The core functionality of an Air Condition Compressor is to compress the refrigerant and spread them evenly throughout the Air Conditioning system and thats why it is considered as the heart of any Air Conditioning system. An Air Condition Compressor is a mechanical pump that is operated by a belt fitted to a vehicle’s engine. The Air Condition Compressor pulley fitted with the engine makes to and fro movement with the help of the AC compressor clutch, to feed fresh air in to the system. The Air Condition Compressor absorbs the refrigerant from the evaporator at a low pressure-side. Then it compresses the air and squeezes it into the condenser at a high-pressure. The Air Condition Compressor is also one of the junctions which divides both high and low pressure sides of the Air Conditioning system. When you sense an unusual belt-slipping noise or clutch burning smell under the dashboard of your vehicle, then its time to change your Air Condition Compressor.

If you find any of the above troubles in your Air Condition Compressor, definitely, you need an exact factory replacement, which is available at Discount AC Parts. We have listed almost all AC parts in our online catalog which are highly tested and genuine parts at easily affordable prices. All you need to do is to select the right year and the model of your vehicle, and get the replacement part.

We sell the same Air Condition Compressor as the dealership at nearly half the price. We have brand new OEM brand, brand new Discount AC brand and remanufactured OEM brand Air Condition Compressor. All Air Condition Compressor come with a full one year, unlimited miles gold warranty. Gold warranty means if anything goes wrong with the Air Condition Compressor, we will replace it and cover the shipping of the part both ways. Also, if needed, we will even cover next day air shipping.

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Auto Repair Cary NC – P – A Smith Auto Maintenance #air #conditioning #repair #cary #nc


Providing Quality Local Auto Repair in Cary, NC!

One-Stop Shop for Your Automotive Needs

P A Smith Auto Maintenance

Reputation for Excellence

Since 1986, P A Smith Auto Maintenance has been a locally owned and operated auto repair service center serving Cary, NC and surrounding areas. We understand how important it is that our customers trust the services that we provide. With exceptional repairs and maintenance services, we should be your first and last answer for auto service. P A Smith Auto Maintenance seeks to go above and beyond to meet its customer’s repair needs. Our highly trained mechanics are genuinely interested in resolving your auto repair issues and are dedicated to delivering you complete satisfaction. P A Smith is a leader in the auto repair service industry, and we’re happy to answer any questions you have about your vehicle’s repair or maintenance service. We will always get your approval before beginning any unexpected work.

Service for All Makes Models Import Domestic

At P A Smith, we specialize in import repair, including BMW, VW, Honda, Audi, Acura, Toyota, Lexus, Scion, Subaru, Volvo, Hyundai, Kia, Nissan and Infiniti services. However, we have the knowledge and skills to also repair domestic cars, light trucks, crossovers, SUVs, and even hybrids. No matter the make or model, you can trust that the skilled team of technicians at P A Smith has the tools and training to perform the auto repair services your car requires. Give us a call today or schedule service online now. We look forward to serving you!

Auto Repair Experts

With more than 75 years of combined experience, our ASE (Automotive Service Excellence) Certified Technicians are skilled on all levels, from basic automotive maintenance such as an oil change, to more complex auto repair issues like brake repair and air conditioning service. We specialize in import repair, including BMW, VW, Honda, Audi, Acura, Toyota, Lexus, Scion, Subaru, Volvo, Hyundai, Kia, Nissan and Infiniti services. However, we have the knowledge and skills to also repair domestic cars, light trucks, crossovers, SUVs, and even hybrids.

More than Just Car Service

Our experienced and knowledgeable staff at P A Smith Auto Maintenance will help you repair and maintain your vehicle. In addition to normal repairs and maintenance, we also perform North Carolina safety and emissions inspections. If your vehicle needs body and trim repairs, such as mirrors and door handles, we can take care of that too. For superior driving capability at night, we also have a complete headlight restoration service!

Customer Care Convenience

At P A Smith Auto Maintenance, we stand behind the quality of every service with a 12 month/12,000 mile warranty so you can be confident in our work too. For your convenience, we provide a free local shuttle service to help get you where you need to go if you are unable to stay during your car’s service. We understand that your vehicle is a large investment, which is why we are proud to offer financing options through Bosch. Schedule your appointment online now, or come see us today!

Schedule your appointment online now, or come see us today!

Makes We Specialize in Repairing:

What Our Customers Are Saying:

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Best Air Conditioning Repair Service in Raleigh #emergency #ac #repair #raleigh #nc, #best #air #conditioning #repair #service #in #wake #county


Air Conditioning Repair Service in Raleigh NC

Icy Hot Heating and Air Conditioning, Inc. offers super fast and professional Air Conditioning Repair when you need it the most. In the summer time your AC plays an important role. It s not always easy to tell when your cooling system will stop working. The chances of your unit breaking down is higher the older your system is especially if it has not gotten the regular maintenance it requires for the long haul. Typically these air conditioners give out when you need them the most which can be the hottest time of the year! For some it happens at the worst possible time when they are entertaining guests or have people visiting for the weekend.

If you are having an emergency situation we are here for you and understand that you need high quality expert service right away. Our licensed technicians are standing by to help you in your time of need.

4 Main Reasons AC Units Need Repair

Lack of Regular Maintenance

The likely causes of air conditioner breakdowns are letting them run for prolonged times without having them properly serviced. The longer your units operate without the necessary maintenance the more issues build up and degrade the efficiency and level of operation of your cooling system. Often times our expert technicians find dirty air filters that cause system malfunctions and haven t been changed for long periods of time. Usually folks also have poorly charged air conditioning systems that have not been properly charged with refrigerant that makes it harder for your AC to remove the heat and cool your residential or commercial properties.

  • AC Part Failure

    The inefficient functioning of your unit can be a result of faulty parts whether the fan controls or the compressor that has worn out. If your unit it cycling on or off a lot this puts pressure on the inner parts of that will cause your unit to operate inefficiently or stop working completely. Oftentimes we have found the outside fan or unit is not working which is the part that removes the heat from the compressor and keeps your refrigerant cool. The condensor fan may stop functioning because of a faulty capacitor. A bad motor bearing can result in overheating or a lack of power to the unit. This can cause compressors to fail prematurely.

  • Issues with the Thermostat

    It can be as simple as a battery that has died or a faulty sensor that needs calibration. This can cuase the A/C unit to not blow cold air. These are but some of the issues that are usually behind the failure of your unit.

  • Condensation Issues

    Air Conditioners will create a lot of condensation. Depending on the brand, some cooling units come with electronic condensate pumps that are connected with tubes that will jam or break due to ice. A professional can help fix this issue if you think you have an issue with your pump.

  • We Have Experience With All HVAC Brands

    Icy Hot Heating and Air Conditioning, Inc. provides full HVAC services. We are proud to have served all cooling systems. The following are just some of the HVAC brands we have serviced:

    Carrier, Aire-Flo, Ducane, Goodman, Lenox, Tappan, Trane, Climate Master, Emerson, Haier, Mitsubishi Electric, Tempstar, American Standard, Coleman, Friedrich, Heil, Payne, Weatherking, Bryant, Comfort Maker, Fridigaire, Janitrol, Rheem, Whirlpool, Amana, Daikin, General Electric (GE), Kenmore, RUUD, York.

    Emergency Expert AC Repair Techs in the Raleigh Area

    Do you hear loud noises coming from your AC each time it starts? Did your AC stop running? Do you find your summertime energy bills irregularly high? Is there an imbalance in the way some of your rooms are more colder than others? We are here to help. If you have noticed an issue with your air conditioning unit, don t wait too long to contact a professional. Waiting for too long will run the risk of damaging other components of your unit and negatively effect the efficiency of your system. If you have central air units, heat pumps or ductless mini splits we can help bring back the comfort to your home. Call us to ask any further questions you may have about our repair process. If you have an AC emergency Call (919)673-7667 and we can help restore the comfort to your home or business.

    • I really can’t say enough great things about IcyHot! I work with a property management company that manages over 225 homes in Wake County. We have used IcyHot literally hundreds of times over the past couple years and haven’t been let down once. He keeps his word, prices are reasonable and no one js faster to respond to an HVAC emergency. HIGHLY, highly recommend! Get your AC repair with them, you’ll be glad you did! Liz Frohman on 04/19/2016
    Nearby Places

    Subway, Sonic Drive-In, Hong Kong Chinese Restaurant

    Gas & Convenience

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  • Mr Breeze Heating and Cooling #furnace, #new #furnace, #air #conditioning, #air #conditioner, #a/c #repair, #heater, #heater #repair, #furnace #repair, #furnace #installation, #furnace #replacement, #heat #pump, #heater #repair, #heating #and #cooling, #heating #and #air #conditioning, #repair #air #contioning, #repair #air #conditioner, #home #heating, #home #cooling, #service #air #conditionr, #boiler, #heating #and #air, #air #conditioning #unit, #geothermal, #hvac, #radiant #heat, #leavenworth #kansas, #lansing #kansas, #basehor #kansas, #tonganoxie #kansas, #atchison #kansas, #weston #missouri, #platte #city #missouri, #winchester #kansas


    Selecting the right air conditioning unit for your home is crucial, especially if you want to save on energy bills every month. Mr Breeze is committed to your complete satisfaction, offering you the highest level of Air Conditioning Repair services in the area! When you need exceptional and affordable air conditioning services in Leavenworth Kansas area, call on Mr Breeze!

    Mr. Breeze Heating and Cooling of Leavenworth, KS brings their 20 years of experience installing and repairing Heaters, furnaces, A/C, boilers and heat pumps to your home – to fill your needs. We are licensed, insured and bonded mechanical contractors with EPA-certified technicians trained in the best industry practices and equipment. Our technicians fix your system right the first time – at a reasonable price. Furnaces, Heaters, Air conditioning! All repair costs are quoted BEFORE the repair begins – so there are no surprises.

    Always think ahead and take care of your system! When it’s extra HOT or FREEZING outside your Furnace, Heater or air conditioner runs longer and small problems you haven’t noticed can become big ones! Service your unit before it’s truly broken! Preventative maintenance is the #1 way to save money on your heating and cooling bill!

    See what Mr Breezes customers have to say about the exceptional workmanship, quality, and value they have received!

    Mr. Breeze
    Heating and Cooling Yes we service all brands, yes we can fix your system, and YES, we can be right there.

    Mr Breeze can provide you with new heating systems, heating system repairs, furnace replacements, Furnace Repairs, air conditioner replacements, air conditioner repairs, as well as tune-ups and seasonal maintenance. We have helped our customers with all their heating and Air Conditioning problems with the help of our up-to-date technology and experienced professionals. You can get rid of unnecessary heating and cooling system problems. We are just a phone call away whenever you need a replacement, or repair.

    Residential HVAC Services

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    How air conditioning changed the world – BBC News #roman #air #conditioning


    How air conditioning changed the world

    Imagine we could control the weather – pushing a button to make it warmer or cooler, wetter or drier.

    The implications would be enormous. No more droughts or floods, no heat waves or icy roads. Deserts would become verdant. Crops would never fail.

    In fact climate change has sparked some crazy-sounding ideas for hacking the climate, such as spraying sulphuric acid into the upper atmosphere, or dumping quicklime in the oceans.

    Clever as humans are, however, we’re nowhere near precision control of the weather. Outside, at least.

    Since the invention of air conditioning, we have been able to control the weather inside, and that has had some some far-reaching and unexpected effects.

    50 Things That Made the Modern Economy highlights the inventions, ideas and innovations which have helped create the economic world in which we live.

    Ever since our ancestors mastered fire, humans have been able to warm themselves. Cooling down when it’s hot has been more challenging.

    The eccentric Roman emperor Elagabulus sent slaves to bring snow down from the mountains and pile it in his garden, where breezes would carry the cooler air inside.

    The humidity problem

    Needless to say, this was not a scalable solution. At least, not until the 19th century, when Boston entrepreneur Frederic Tudor amassed an unlikely fortune doing something similar.

    He took blocks of ice from frozen New England lakes in winter, insulated them in sawdust, and shipped them to warmer climes for summer.

    Until artificial ice-making took off, mild New England winters caused panic about an “ice famine”.

    Air conditioning as we know it began in 1902, but it had nothing to do with human comfort.

    New York’s Sackett Wilhelms Lithographing and Printing Company became frustrated with varying humidity levels when trying to print in colour.

    Image copyright New York Public Library Image caption Sackett Wilhelms asked a heating company to solve their humidity problem

    The same paper had to be printed four times in four colours, and if the humidity changed between print runs, the paper would slightly expand or contract. Even a millimetre’s misalignment looked awful.

    The printers asked heating company Buffalo Forge to devise a system to control humidity.

    A young engineer called Willis Carrier figured out that circulating air over coils that were chilled by compressed ammonia maintained the humidity at a constant 55%.

    Image copyright Carrier Image caption Willis Carrier was quick to see the wider potential of his humidity-controlling invention

    The printers were delighted.

    Wider benefits

    Buffalo Forge was soon selling Willis Carrier’s invention wherever humidity posed problems, such as to flour mills and the Gillette corporation, where excessive moisture rusted the razor blades.

    These early industrial clients didn’t much care about making temperatures more tolerable for their workers – that was an incidental benefit.

    Image copyright Carrier Image caption Carrier’s original drawings for the system he designed for Sackett Wilhelms

    But by 1906, Carrier was exploring the potential for “comfort” applications in public buildings like theatres.

    It was an astute choice. Historically, theatres often shut down for summer: no windows, human bodies tightly packed together and, before electricity, lighting provided by flares.

    New England ice had been briefly popular.

    In the summer of 1880, New York’s Madison Square Theatre used four tons a day: an eight-foot fan blew air over the ice and through ducts towards the audience.

    Image copyright Alamy

    Unfortunately, though cool, the air was also damp, and with pollution increasing in New England’s lakes, the melting ice sometimes released unpleasant smells.

    Willis Carrier’s “Weathermaker” was much more practical.

    The general public first experienced air conditioning in the burgeoning movie theatres of the 1920s, and it quickly became as much of a selling point as the films.

    Transformative technology

    The enduring Hollywood tradition of the summer blockbuster traces directly back to Carrier, as does the rise of the shopping mall.

    But air conditioning has become more than a mere convenience. It is a transformative technology, which has had a profound influence on where and how we live.

    Computers fail if they get too hot or damp, so air conditioning enables the server farms that power the internet. Indeed, if factories couldn’t control their air quality, we’d struggle to manufacture silicon chips at all.

    Air conditioning has also revolutionised architecture.

    Historically, a cool building in a hot climate implied thick walls, high ceilings, balconies, courtyards and windows facing away from the sun.

    Image copyright Alamy Image caption The invention of air conditioning radically altered housing in America’s so-called “sun belt”

    The dogtrot house, popular in America’s south, was bisected by a covered, open-ended corridor to let breezes through. Before air conditioning, glass-fronted skyscrapers were not a sensible option: you’d bake on the upper floors.

    Air conditioning has changed demographics, too. It’s hard to imagine the rise of cities like Dubai or Singapore without it.

    As residential units spread rapidly across America in the second half of the 20th century, the population in the “sun belt” – the warmer south of the country, from Florida to California – boomed from 28% of Americans to 40%.

    As retirees in particular moved from north to south, they also changed the region’s political balance. The author Steven Johnson has plausibly argued that air conditioning elected Ronald Reagan.

    More from Tim Harford

    Reagan came to power in 1980, a time when America used more than half the world’s air conditioning.

    Emerging economies have since caught up quickly: China will soon become the global leader. The proportion of air-conditioned homes in Chinese cities jumped from under a tenth to more than two-thirds in just 10 years.

    In countries like India, Brazil and Indonesia, the market for air conditioners is expanding at double-digit rates. And there’s plenty more room for growth: 11 of the world’s 30 largest cities are in the tropics.

    Image copyright Getty Images

    The boom in air conditioning is good news for many reasons.

    Studies show that it lowers mortality during heat waves. Heat makes prison inmates fractious – air conditioning pays for itself by reducing fights.

    When the temperature exceeds 21C or 22C in exam halls, students start to score lower in maths tests.

    In offices, air conditioning makes us more productive: according to one early study, it made US government typists do 24% more work.

    Economists have since confirmed that relationship between productivity and keeping cool.

    Inconvenient truth

    William Nordhaus divided the world into cells, by lines of latitude and longitude, and plotted each one’s climate, output and population. The hotter the average temperature, he found, the less productive the people.

    According to Geoffrey Heal and Jisung Park. a hotter-than-average year is bad for productivity in hot countries, but good in cold ones. They conclude that human productivity peaks at between 18C and 22C.

    But there’s an inconvenient truth: you can only make it cooler inside by making it warmer outside.

    A study in Phoenix, Arizona, found the hot air pumped out of air conditioning units increased the city’s night-time temperature by 2C,

    Of course, that makes air conditioning units work harder, making the outside hotter still.

    Image copyright Getty Images

    On underground metro systems, cooling the trains can lead to swelteringly-hot platforms.

    Then there’s the electricity that powers air conditioning – often made by burning gas or coal – and the coolants air conditioners use, many of which are powerful greenhouse gases when they leak.

    Air conditioning technology is getting cleaner and greener.

    But demand is growing so quickly that – even if the optimists are right about possible efficiency gains – there’ll be an eightfold increase in energy consumption by 2050.

    That’s worrying news for climate change. When will we get inventions to control the outdoor weather, too?

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    Consistent Quality Service in Air Conditioning and Heating Repairs & Installation in Houston TX

    From its inception in 1986, Central City Air has been family owned and operated and on the forefront of custom, quality air conditioning and heating installations in Houston. Our team of specialists coordinate every project from start to finish. Central City Air never has and never will use outside contractors for any of our system installations or A/C and heating services. Everybody from our receptionists to system installation crew works exclusively for Central City Air. We have been licensed to do business in Houston since 1973 with a Class A, City of Houston license.

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