How does air conditioning actually work?

Answer 1

By the process of heat exchange.

In simple terms, draw warm air from the room over cooling elements (coils or fins that have some coolant fluid running through), the cooling elements draw heat energy from the air (making the air cooler and the coolant in the cooling elements warmer), and blow the cooled air back out into the room. The warmed coolant goes back into the compressor where it is cooled again and gets fed back into the cycle.

Answer 2

An air conditioner uses a condensable working fluid--a chemical that easily converts from a gas to a liquid and vice versa--to transfer heat from the air inside of a home to the outside air. This process involves three major components and at least one fan. The three major components are a compressor, a condenser, and an evaporator. The compressor and condenser are usually located on the outside air portion of the air conditioner while the evaporator is located on the inside air portion. The working fluid passes through the insides of these three components in order, over and over again, so I'll start examining what happens to the working fluid as it enters the compressor.

The working fluid arrives at the compressor as a cool, low pressure gas. The compressor squeezes this working fluid, packing its molecules more tightly together so that their density and pressure increase. The squeezing process also does work on the working fluid, increasing its energy and therefore its temperature. The working fluid leaves the compressor as a hot, high-pressure gas and flows into the condenser. The condenser has metal fins all around it that assist the working fluid in transferring heat to the surrounding outdoor air. As this transfer takes place, the closely spaced molecules of the working fluid begin to stick to one another, releasing additional thermal energy into the surrounding air and causing the working fluid to transform into a liquid. By the time the working fluid leaves the condenser, its temperature has almost dropped back down to the outdoor temperature but it is now a liquid rather than a gas.

This high pressure liquid then flows into the evaporator through a narrow orifice. This orifice allows the liquid's pressure to drop so that it begins to evaporate into a gas. As it evaporates, it extracts heat from the air around the evaporator because that heat is needed to separate the molecules of the working fluid. Like the condenser, the evaporator has metal fins to assist it in exchanging thermal energy with the surrounding air. By the time the working fluid leaves the evaporator, it is a cool, low-pressure gas. It then returns to the compressor to begin its trip all over again.

Overall, the working fluid releases heat into the outside air and absorbs heat from the inside air. The direction of heat transfer, from a cooler region to a hotter region, is the reverse of normal and requires an input of ordered energy so that it doesn't violate the second law of thermodynamics (the disorder of an isolated system can never decrease). This ordered energy is used to operate the compressor and is converted into thermal energy in the process. This additional disordered thermal energy enters the outside air and makes up for the additional order that's given to the indoor air as that air is cooled.

Answer 3

The compressor is the heart of your air conditioner. It takes your refrigerant, compresses it, and sends it to a condenser as a high pressure hot gas. The condenser is made up of coils, and located outside where the heat can be left out. You've seen these, the bigger ones have fans to pull air across the coils to remove the heat. The hot gas goes into the coils where the heat it pulled from it. This causes the refrigerant to condense to a cooled liquid. The cooled, pressurized liquid flows to a metering device. The liquid refrigerant is slowly released (metered), depending on the amount needed. The released refrigerant enters the coils of your cooling coil, where the air you want cooled is pushed across it by your air conditioner's fan. The refrigerant absorbs the heat from the air, cooling the air. The heated refrigerant expands to a low pressure gas and goes back to the compressor to cycle back around again.

Answer 4

If glasses are worn continuously over time the poor vision will generally become worse. Essentially what glasses do is lock the eyes into their refractive state and in order to see through your lenses you have to maintain the poor vision that the lenses are designed to correct.
This the method I used to restore perfectly my vision naty secret to restore 'near perfect' 20/20 vision naturally http://getyourvisionbacknow.keysolve.net
However, here's the good news:
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I'm sure that you will not regret your decision.

Answer 5

Hey,
Specific eye exercises can really help to improve your vision without surgery. I'm following this system http://www.goobypls.com/r/rd.asp?gid=413 and it's working well.
Very useful program!

Answer 6

it uses CFC/freon as a circulating liquid to bring the heat out of the house or vice versa.

For fluid, there's a characteristic pressure-temperature relationship between them, so, by giving the fluid work at a certain pressure, u can change its temperature.

Answer 7

So yours has stopped working otherwise u wud have been enjoying its chill rather then having to think about something like this.

Answer 8

it doesnt, it just spreads about germs at work , so if you work in call center like i did you catch everything possible from the air, from everyone else. ewwww....

Answer 9

It works just like a fridge!

Answer 10

Air conditioning
From Wikipedia, the free encyclopedia
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Please discuss this issue on the talk page, or replace this tag with a more specific message. Editing help is available.
This article has been tagged since July 2006.
The external section of a typical single-room air conditioning unit. For ease of installation, these are frequently placed in a window. This one was installed through a hole cut in the wall.
The internal section of the same unit. The front panel swings down to reveal the controls.Note: in the broadest sense, "air conditioning" can refer to any form of "heating, ventilation, and air-conditioning." This article is specifically about the use of refrigeration for this purpose.
The first album of the pop group Curved Air was called Airconditioning
An air conditioner is an appliance, system, or mechanism designed to extract heat from an area using a refrigeration cycle. In construction, a complete system of heating, ventilation, and air conditioning is referred to as HVAC.

Contents [hide]
1 History
2 Air conditioning applications
3 Air Conditioning System Basics and Theories
3.1 Refrigeration cycle
3.1.1 Humidity
3.1.2 Refrigerants
4 Air conditioning system equipment
4.1 Evaporation coolers
4.2 Absorptive chillers
5 Thermostats
6 Equipment Capacity
6.1 Seasonal Energy Efficiency Rating (SEER)
7 Insulation
8 Home air conditioning systems around the world
9 Health implications
10 Absorption and solar air conditioning
11 References
12 See also
13 External links
13.1 Servicing Information
13.2 Energy Efficiency
14 Brands



[edit]
History
The 19th century British scientist and inventor Michael Faraday discovered that compressing and liquefying a certain gas could chill air when the liquefied ammonia was allowed to evaporate. His idea remained largely theoretical.

In 1842, Florida physician Dr. John Gorrie used compressor technology to create ice, which he would use to cool air blown over malaria and yellow fever patients. [1] He eventually had a vision of using his ice-making machine to regulate the temperature of buildings. He even envisioned centralized air conditioning that could cool entire cities. [2] Gorrie was granted a patent in 1851 (Patent #8080, USPTO) for his ice-making machine. His hopes for its success vanished soon afterwards when his chief financial backer died. Gorrie did not manage to get the financial backing needed to further develop his machine and solve the leakage and irregular performance problems from which it suffered. According to his biographer, Vivian M. Sherlock, he blamed "Ice King" Frederic Tudor for his failure, alluding that Tudor has launched a smear campaign against his invention. After Gorrie's collapse and death in 1855, his invention and the idea of air conditioning faded away for some years.

Later, in 1902, the first modern, electrical air conditioning was invented by Willis Haviland Carrier (1876–1950). His invention differed from Wolff's (???) in that it controlled not only temperature, but also humidity for improved manufacturing process control for a printing plant in Brooklyn, New York, USA. This specifically helped to provide low heat and humidity for consistent paper dimensions and ink alignment. Later, Carrier's technology was applied to increase productivity in the workplace, and the Carrier Engineering Company, now called Carrier (a division of United Technologies Corporation), was formed in 1915 to meet the new demand. Later still, air conditioning use was expanded to improve comfort in homes and automobiles. Residential sales did not take off, however, until the 1950s. The Royal Victoria Hospital, Belfast, Northern Ireland, is a landmark building in building engineering services (built in 1906) and lays claim to being the first “Air conditioned Building in the World”.

In 1906, Stuart W. Cramer of Charlotte, North Carolina, USA, was exploring ways to add moisture to the air in his southern textile mill. Cramer coined the term "air conditioning" and used it in a patent claim he filed that year as an alternative to "water conditioning", then a well-known process for making textiles easier to work. He combined moisture with ventilation to actually "condition" and change the air in the factories, controlling the humidity so necessary in textile plants. Willis Carrier adopted the term and incorporated it into the name of the company he founded in 1907, The Carrier Air Conditioning Company of America.

The first air conditioners and refrigerators employed toxic gases like ammonia and methyl chloride, which resulted in fatal accidents when they leaked. Thomas Midgley, Jr. created the first chlorofluorocarbon gas, dubbed Freon in 1928. The refrigerant proved much safer for humans but is harmful to the atmosphere's ozone layer. "Freon" is a trade name of Dupont for any CFC, HCFC, or HFC refrigerant, the name of each including a number indicating molecular composition (R-11, R-12, R-22, R-134). The blend most used in direct-expansion comfort cooling is an HCFC known as R-22, and it is slated to be phased out for use in new equipment by 2010 and completely discontinued by 2020. R-11 and R-12 are no longer manufactured in the US, the only source for purchase being the cleaned and purified gas recovered from other air conditioner systems. Several ozone-friendly refrigerants have been developed as alternatives, including R-410A, known by the brand name "Puron".

[edit]
Air conditioning applications
Air conditioning engineers broadly divide air conditioning applications into comfort and process.

Comfort applications aim to provide an indoor environment that remains relatively constant in a range preferred by humans despite changes in external weather conditions or in internal heat loads. Some have claimed that comfort air conditioning increases worker productivity but this claim is disputed, one counter argument being that apparent increases in productivity can be explained as resulting from workers perceiving that their employer shows an interest in their welfare. (See Hawthorne effect). What is certain is that comfort air conditioning makes deep plan buildings feasible. Without air conditioning, buildings must be built narrower or with light wells so that inner spaces receive sufficient fresh air. Air conditioning also allows building to be taller since wind speed increases significantly with altitude making natural ventilation impractical for very tall buildings. Comfort applications for various buiding types is quite different and may be categorized as:

Residential Buildings including single family houses and hi-rise buildings.
Institutional Buildings includes Hi-Rise offices, large complex buildings, hospitals, and so on
Commercial Buildings which are built for profit and commerce, including malls, shopping centers, apartment housings, etc.
Process applications aim to provide a suitable environment for a process being carried out, regardless of internal heat loads and external weather conditions. Although often in the comfort range, it is the needs of the process that determine conditions, not human preference. Process applications include:

Hospital operating Suites in which air is filtered to high levels to reduce infection risk and the humidity controlled to limit patient dehydration. Although temperatures are often in the comfort range, some specialist procedures such as open heart surgery require low temperatures (about 18 °C, 64 °F) and others such as neonatal relatively high temperatures (about 28 °C, 82 °F).
Cleanrooms for the production of integrated circuits, pharmaceuticals and the like in which very high levels of air cleanliness and control of temperature and humidity are required for the success of the process.
Facilities for breeding laboratory animals. Since many animals normally only reproduce in spring, holding them in rooms at which conditions mirror spring all year can cause them to reproduce year round.
Aircraft air conditioning. Although nominally aimed at providing comfort for passengers and cooling of equipment, aircraft air conditioning presents a special process because of the low air pressure outside the aircraft.
Data Processing Centers
Textile Factories
Physical Testing Facilities
Plants and Farm Growing Areas
Nuclear Facilities
Mines
Industrial Envirinments
Food Cooking and Processing Areas
In both comfort and process applications not only is the objective to control temperature (although in some comfort applications this is all that is controlled) but other factors including humidity, air movement and air quality.

[edit]
Air Conditioning System Basics and Theories
[edit]
Refrigeration cycle

A diagram of the refrigeration cycle: 1) condensing coil, 2) expansion valve, 3) evaporator coil, 4) compressor.In the refrigeration cycle, a heat pump transfers heat from a lower temperature heat source into a higher temperature heat sink. Heat would naturally flow in the opposite direction. This is the most common type of air conditioning. A refrigerator works in much the same way, as it pumps the heat out of the interior into the room in which it stands.

This cycle takes advantage of the universal gas law PV = nRT, where P is pressure, V is volume, R is the universal gas constant, T is temperature, and n is the number of moles of gas (1 mole = 6.022×1023 molecules).

The most common refrigeration cycle uses an electric motor to drive a compressor. In an automobile the compressor is driven by a pulley on the engine's crankshaft, with both using electric motors for air circulation. Since evaporation occurs when heat is absorbed, and condensation occurs when heat is released, air conditioners are designed to use a compressor to cause pressure changes between two compartments, and actively pump a refrigerant around. A refrigerant is pumped into the cooled compartment (the evaporator coil), where the low pressure and load temperature cause the refrigerant to evaporate into a vapor, taking heat with it. In the other compartment (the condenser), the refrigerant vapour is compressed and forced through another heat exchange coil, condensing into a liquid, rejecting the heat previously absorbed from the cooled space.

[edit]
Humidity
Refrigeration air conditioning equipment usually reduces the humidity of the air processed by the system. The relatively cold (below the dewpoint) evaporator coil condenses water vapor from the processed air, (much like an ice cold drink will condense water on the outside of a glass), sending the water to a drain and removing water vapor from the cooled space and lowering the relative humidity. Since humans perspire to provide natural cooling by the evaporation of perspiration from the skin, drier air (up to a point) improves the comfort provided. The comfort air conditioner is designed to create a 40% to 60% relative humidity in the occupied space. In food retailing establishments large open chiller cabinets act as highly effective air dehumidifying units.

Some air conditioning units dry the air without cooling it. They work like a normal air conditioner, except that a heat exchanger is placed between the intake and exhaust. In combination with convection fans they achieve a similar level of comfort as an air cooler in humid tropical climates, but only consume about 1/3 of the electricity. They are also preferred by those who find the draft created by air coolers discomforting.

[edit]
Refrigerants
"Freon" is a trade name for a family of haloalkane refrigerants manufactured by DuPont and other companies. These refrigerants were commonly used due to their superior stability and safety properties. Unfortunately, evidence has accumulated that these chlorine bearing refrigerants reach the upper atmosphere when they escape. The chemistry is poorly understood but general consensus seems to be that CFCs break up in the stratosphere due to UV-radiation, releasing their chlorine atoms. These chlorine atoms act as catalysts in the breakdown of ozone, which does severe damage to the ozone layer that shields the Earth's surface from the strong UV radiation. The chlorine will remain active as a catalyst until and unless it binds with another particle forming a stable molecule. CFC refrigerants in common but receding usage include R-11 and R-12. Newer and more environmentally-safe refrigerants include HCFCs (R-22, used in most homes today) and HFCs (R-134a, used in most cars) have replaced most CFC use. HCFCs in turn are being phased out under the Montreal Protocol and replaced by hydrofluorocarbons (HFCs), such as R-410A, which lack chlorine.

[edit]
Air conditioning system equipment
[edit]
Evaporation coolers
The aforementioned Persian cooling systems were evaporation coolers. In very dry climates, so-called "swamp coolers" are popular for improving comfort during hot weather. The evaporative cooler is a device that draws outside air through a wet pad. The sensible heat of the incoming air, as measured by a dry bulb thermometer, is reduced. The total heat (sensible heat plus latent heat) of the entering air is unchanged. Some of the sensible heat of the entering air is converted to latent heat by the evaporation of water in the wet cooler pads. If the entering air is dry enough, the results can be quite comfortable. These coolers cost less and are mechanically simple to understand and maintain.

An early type of cooler, using ice for a further effect, was patented by John Gorrie of Apalachicola, FL in 1842, who used the device to cool the patients of his malaria hospital.

There is a process called absorptive refrigeration which uses heat to produce cooling. In one instance, a three-stage absorptive cooler first dehumidifies the air with a spray of salt-water or brine. The brine osmotically absorbs water vapor from the air. The second stage sprays water in the air, cooling the air by evaporation. Finally, to control the humidity, the air passes through another brine spray. The brine is reconcentrated by distillation. The system is used in some hospitals because, with filtering, a sufficiently hot regenerative distillation removes airborne organisms.

[edit]
Absorptive chillers
Some buildings use gas turbines to generate electricity. The exhausts of these are hot enough to drive an absorptive chiller that produces cold water. The cold water is then run through radiators in air ducts for hydronic cooling. The dual use of the energy, both to generate electricity and cooling, makes this technology attractive when regional utility and fuel prices are right. Producing heat, power, and cooling in one system is known as trigeneration.

[edit]
Thermostats
Thermostats control the operation of HVAC systems, turning on the heating or cooling systems to bring the building to the set temperature. Typically the heating and cooling systems have separate control systems (even though they may share a thermostat) so that the temperature is only controlled "one-way". That is, in winter, a building that is too hot will not be cooled by the thermostat. Thermostats may also be incorporated into facility energy management systems in which the power utility customer may control the overall energy expenditure. In addition, a growing number of power utilities have made available a device which, when professionally installed, will control or limit the power to an HVAC system during peak use times in order to avoid necessitating the use of rolling blackouts. The customer is given a credit of some sort in exchange.

[edit]
Equipment Capacity
Air conditioner equipment power in the U.S. is often described in terms of "tons of refrigeration". A "ton of refrigeration" is defined as the cooling power of one short ton (2000 pounds or 907 kilograms) of ice melting in a 24-hour period. This is equal to 12,000 BTU per hour, or 3517 watts (http://physics.nist.gov/Pubs/SP811/appenB9.html). Residential "central air" systems are usually from 1 to 5 tons (3 to 20 kW) in capacity.

The use of electric/compressive air conditioning puts a major demand on the nation's electrical power grid in warm weather, when most units are operating under heavy load. In the aftermath of the 2003 North America blackout locals were asked to keep their air conditioning off. During peak demand, additional power plants must often be brought online, usually natural gas fired plants because of their rapid startup. A 1995 study of various utility studies of residential air conditioning concluded that the average air conditioner wasted 40% of the input energy. This energy is lost in the form of heat, which must be pumped out. There is a huge opportunity to reduce the need for new power plants and to conserve energy.

In an automobile the A/C system will use around 5 hp (4 kW) of the engine's power.

The Association of Home Appliance Manufacturers (AHAM) offers a worksheet that can help you estimate how powerful an air conditioner you need. The worksheet guides you through the measurements needed to calculate the size of the air conditioner, and then it automatically calculates the final answer for you.

[edit]
Seasonal Energy Efficiency Rating (SEER)
For residential homes, some countries set minimum requirements for energy efficiency. The efficiency of air conditioners are often (but not always) rated by the Seasonal Energy Efficiency Ratio (SEER). The higher the SEER rating, the more energy efficient is the air conditioner. The SEER rating is the Btu of cooling output during its normal annual usage divided by the total electric energy input in watt-hours (W·h) during the same period. [1]

SEER = BTU ÷ W·h
For example, a 5000 Btu/h air-conditioning unit, with a SEER of 10, operating for a total of 1000 hours during an annual cooling season (i.e., 8 hours per day for 125 days) would provide an annual total cooling output of:

1000 Btu/h × 5000 h = 5,000,000 Btu
which, for a SEER of 10, would be an annual electrical energy usage of:

5,000,000 Btu ÷ 10 = 500,000 W·h
and that is equivalent to an average power usage during the cooling season of:

500,000 W·h ÷ 1000 h = 500 W
SEER is related to the coefficient of performance (COP) commonly used in thermodynamics and also to the Energy Efficiency Ratio (EER). The EER is the efficiency rating for the equipment at a particular pair of external and internal temperatures, while SEER is calculated over a whole range of external temperatures (i.e., the temperature distribution for the geographical location of the SEER test). The COP is different in that it is a unitless parameter. Formulas for the approximate conversion between SEER and EER or COP are available from the Pacific Gas and Electric company in California:[2]

(1) SEER = EER ÷ 0.9
(2) SEER = COP x 3.792
(3) EER = COP x 3.413
From equation (2) above, a SEER of 13 is equivalent to a COP of 3.43, which means that 3.43 units of heat energy are pumped per unit of work energy.

Today, it is rare to see systems rated below SEER 9 in the United States, since older units are being replaced with higher efficiency units. The United States now requires that residental systems manufactured in 2006 have a minimum SEER rating of 13 (although window-box systems are exempt from this law, so their SEER is still around 10).[3] Substantial energy savings can be obtained from more efficient systems. For example by upgrading from SEER 9 to SEER 13, the power consumption is reduced by 30% (equal to 1 - 9/13). It is claimed that this can result in an energy savings valued at up to $US 300 per year (depending on the usage rate and the cost of electricity). In many cases, the lifetime energy savings is likely to surpass the higher initial cost of a high-efficiency unit.

As an example, the annual cost of electric power consumed by a 72,000 BTU/h air conditioning unit operating for 1000 hours per year with a SEER rating of 10 and a power cost of $0.08 per kilowatt-hour (kW·h) may be calculated as follows:

unit size, BTU/h × hours per year, h × power cost, $/kW·h ÷ (SEER, BTU/W·h × 1000 W/kW)
(72,000 BTU/h) × (1000 h) × ($0.08/kW·h) ÷ [(10 BTU/W·h) × (1000 W/kW)] = $576.00 annual cost
Air conditioner sizes are often given as "tons" of cooling. Multiplying the tons of cooling by 12,000 converts it to BTU/h.

A common misconception is that the SEER rating system also applies to heating systems. However, SEER ratings only apply to air conditioning.

Air conditioners (for cooling) and heat pumps (for heating) both work similarly in that heat is transferred or "pumped" from a cooler "heat-source" to a warmer "heat-sink". Air conditioners and heat pumps usually operate most effectively at temperatures around 50 to 55 degrees Fahrenheit. Typically when the heat source temperature falls below 40 degrees Fahrenheit, the system begins to reach a point called the "balance point", where the system is not able to "pull" any more heat out of the heat-source (this point varies from heat pump to heat pump). Similarly, when the heat-sink temperature rises to about 120 degrees Fahrenheit, the system will operate less effectively, and will not be able to "push" out any more heat. Ground-source (geothermal) heat pumps don't have this problem of reaching a "balance point" because they use the ground as a heat source/heat sink and the ground's thermal inertia prevents it from becoming too cold or too warm when moving heat from or to it. The ground's temperature does not vary nearly as much over a year as the air above it does.

[edit]
Insulation
Insulation reduces the required power of the air conditioning system. Thick walls, reflective roofing material, curtains and trees next to building also cut down on system and energy requirements.

[edit]
Home air conditioning systems around the world
Domestic air conditioning is most prevalent and ubiquitous in developed Asian nations such as Japan, South Korea, Singapore and Hong Kong, especially in the latter two due to most of the population living in small high-rise flats. In this area, with soaring summer temperatures and a high standard of living, air conditioning is considered a necessity and not a luxury. Japanese-made domestic air conditioners are usually window or split types, the latter being more modern and expensive. It is also increasing in popularity with the rising standard of living in tropical Asian nations such as India, Malaysia and the Philippines.

In the United States, home air conditioning is more prevalent in the South and on the East Coast, in most parts of which it has reached the ubiquity it enjoys in East Asia. Central air systems are most common in the United States, and are virtually standard in all new dwellings in most states.

In Europe, home air conditioning is less common in part due to higher energy costs. The lack of air conditioning in homes, in residential care homes and in medical facilities was identified as a contributing factor to the estimated 35,000 deaths left in the wake of the 2003 heat wave.

[edit]
Health implications
Air conditioning has no greater influence on health than heating—that is to say, very little—although poorly maintained air-conditioning systems (especially large, centralized systems) can occasionally promote the growth and spread of microorganisms, such as Legionella pneumophila, the infectious agent responsible for Legionnaire's disease, or thermophilic actinomycetes.[4] Conversely, air conditioning (including filtration, humidification, cooling, disinfection, etc.) can be used to provide a clean, safe, hypoallergenic atmosphere in hospital operating rooms and other environments where an appropriate atmosphere is critical to patient safety and well-being. Air conditioning can have a positive effect on sufferers of allergies and asthma.[5]

Although many people superstitiously believe that air conditioning is unconditionally dangerous for one's health, especially in areas where air conditioning is not common, this belief is unsupported by fact; properly maintained air-conditioning systems do not cause or promote illness. As with heating systems, the advantages of air conditioning generally far outweigh the disadvantages.

[edit]
Absorption and solar air conditioning
ClimateWell AB supplies solar air conditioner equipment for home or office use.

This section is a stub. You can help by adding to it.
[edit]
References
^ Definition of SEER (scroll down to "Seasonal energy efficiency ratio")
^ SEER conversion formulas from Pacific Gas and Electric
^ Minimum SEER ratings required in the US
^ Sick building syndrome
^ Home Control of Asthma & Allergies
[edit]
See also
Air filter
Central air conditioning
Energy
Energy conservation
Evaporative cooler
Heat pump
Heating
HVAC
Hydronics
Misting fan
Noise mitigation
Portable air conditioners
Renewable energy
Refrigeration
Trigeneration
[edit]
External links
[edit]
Servicing Information
Directory of Air Conditioning Manufacturers
[edit]
Energy Efficiency
Consumer Guide to Home Energy Savings - Central Air Conditioners from the American Council for an Energy Efficient Economy (ACEEE)
Energy Efficiency Program Database from the ACEEE
Space heating and cooling from the U.S. Department of Energy's Energy Efficiency and Renewable Energy
UK Enhanced Capital Allowance Scheme (ECA), a UK Government scheme to provide tax rebates for companies who use products which are ECA approved.
International Energy Agency - Energy Conservation In Buildings And Community Systems
AHAM website on Room-air Conditioners
[edit]
Brands
Amcor
AEG
Amana
Aircon
Airwell
American Standard Companies
Ariagel
Bergland Industries
Bryant
BlueStar
Carrier Corporation
Coleman Company
Crafft
Daikin Industries
Danby
DeLonghi
Friedrich
Fujitsu
Frigidaire
General Electric
Goettl
General Airconditioners
Goodman
Goldstar
Haier
Hitachi
Janitrol
Lennox
LG Group
Mitsubishi Electric Corporation
Mitsubishi Heavy Industries
Noma
National
Panasonic
Rheem
Ruud
Samsung
Sanyo
Technicool
Thermo King
Toshiba
Trane
Videocon International
Voltas
Waterloo Air Products Ltd.