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[[Image:Single-room AC unit-external.jpg|thumb|The external section of a generic single-room air conditioning unit. For ease of installation, units are typically fitted into windows or, as in this photograph, a hole in the wall]][[Image:Single-room AC unit-internal.jpg|thumb|right|The internal section of the same unit. The front panel swings down to reveal the controls.]]

[[Image:Single-room AC unit-external.jpg|thumb|The external section of a generic single-room air conditioning unit. For ease of the installation, units are typically fitted into windows or, as in this photograph, a hole in the wall]][[Image:Single-room AC unit-internal.jpg|thumb|right|The internal section of the same unit. The front panel swings down to reveal the controls.]]

:''Note:the term "air conditioning" refers to any form of "[[Heating]], [[ventilation]] and air-conditioning"''. This article deals specifically with units used as part of a cooling system.''

:''Note:the term "air conditioning" refers to any form of "[[Heating]], [[ventilation]] and air-conditioning"''. This article deals specifically with units used as part of a cooling system.''

An '''air conditioner''' is a system or a machine that treats air in a defined, usually enclosed area via a refrigeration cycle in which warm air is removed and replaced with cooler air.  

An '''air conditioner''' is a system or a [[machine]] that treats air in a defined, usually enclosed area via a refrigeration cycle in which warm air is removed and replaced with cooler air.  

In construction, a complete system of heating, ventilation, and air conditioning is referred to as [[HVAC]]. Whether in homes, offices or vehicles, its purpose is to provide comfort by altering the properties of the air, usually by cooling the air inside.The main function of air conditioner is to change adverse temperature.  

In construction, a complete system of heating, ventilation, and air conditioning is referred to as [[HVAC]]. Whether in homes, offices or vehicles, its purpose is to provide comfort by altering the properties of the air, usually by cooling the air inside.The main function of air conditioner is to change adverse temperature.

==History==

==History==

In the 19th century [[United Kingdom|British]] [[scientist]] and [[inventor]] [[Michael Faraday]] discovered that compressing and liquefying [[ammonia]] could chill air when the liquefied ammonia was allowed to evaporate.  

In the 19th century [[United Kingdom|British]] [[scientist]] and [[inventor]] [[Michael Faraday]] discovered that compressing and liquefying [[ammonia]] could chill air when the liquefied ammonia was allowed to evaporate.  

In [[1842]], [[United States of America|American]] physician [[John Gorrie|Dr. John Gorrie]] used [[Gas compressor|compressor]] technology to create [[ice]], which he used to cool air for his patients.<ref>{{cite web|title=Gorrie Ice Machine, Patent Model|url=https://americanhistory.si.edu/collections/search/object/nmah_846192|website=National Museum of American History|accessdate=July 17, 2020}}</ref> He hoped eventually to use his ice-making machine to regulate the temperature of buildings and even considered cooling entire cities with a system of centralized air conditioning units.

In [[1842]], [[United States of America|American]] physician [[John Gorrie|Dr. John Gorrie]] used [[Gas compressor|compressor]] technology to create [[ice]], which he used to cool air for his patients.<ref>{{cite web|title=Gorrie Ice Machine, Patent Model|url=https://americanhistory.si.edu/collections/search/object/nmah_846192|website=National Museum of American History|access-date=July 17, 2020}}</ref> He hoped eventually to use his ice-making machine to regulate the temperature of buildings and even considered cooling entire cities with a system of centralized air conditioning units.

==Air conditioning applications==

==Air conditioning applications==

==Health implications==

==Health implications==

Air conditioning has as much influence on human health as any generic heating system.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]].<ref>[http://www.merck.com/mrkshared/mmanual/section6/chapter75/75e.jsp Sick building syndrome]</ref>  Air conditioning can have a positive effect on sufferers of [[allergy|allergies]] and [[asthma]].<ref>[http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E&b=22591 Home Control of Asthma & Allergies]</ref>

Air conditioning has as much influence on human health as any generic heating system.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]].<ref>[http://www.merck.com/mrkshared/mmanual/section6/chapter75/75e.jsp Sick building syndrome]</ref>  Air conditioning can have a positive effect on sufferers of [[allergy|allergies]] and [[asthma]].<ref>{{Cite web |url=http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E&b=22591 |title=Home Control of Asthma & Allergies |access-date=2007-06-30 |archive-date=2009-06-18 |archive-url=https://web.archive.org/web/20090618051853/http://www.lungusa.org/site/pp.asp?c=dvLUK9O0E&b=22591 |url-status=dead }}</ref>

In serious [[heat wave]]s, air conditioning can save the lives of the elderly. Some local authorities have even set up public [[cooling center]]s for the benefit of those without air conditioning at home.

In serious [[heat wave]]s, air conditioning can save the lives of the elderly. Some local authorities have even set up public [[cooling center]]s for the benefit of those without air conditioning at home.

The installation of an air conditioner depends on certain criteria, it starts with finding the ideal site for mounting the outdoor unit. To do this, there are several recommendations:

The installation of an air conditioner depends on certain criteria, it starts with finding the ideal site for mounting the outdoor unit. To do this, there are several recommendations:

* The external unit is necessarily in the area of ​​free circulation of air flows.  

* The external unit is necessarily in the area of free circulation of air flows.  

* It is important to organize free access for further maintenance and repair of the unit.

* It is important to organize free access for further maintenance and repair of the unit.

* During operation, exhausted streams of hot air come from the equipment, therefore it must be positioned so that the fumes do not enter the windows of the lower floors.<ref>{{Cite web|url=https://prohlada.dp.ua/news/ustanovit-kondicioner-v-dnepre|title=Выбрать кондиционер в Днепре {{!}} Купить (Заказать) недорого на сайте|website=prohlada.dp.ua|access-date=2020-06-13}}</ref>

* During operation, exhausted streams of hot air come from the equipment, therefore it must be positioned so that the fumes do not enter the windows of the lower floors.<ref>{{Cite web|url=https://prohlada.dp.ua/news/ustanovit-kondicioner-v-dnepre|title=Выбрать кондиционер в Днепре {{!}} Купить (Заказать) недорого на сайте|website=prohlada.dp.ua|access-date=2020-06-13}}</ref>

==Other websites==

==Other websites==

*[http://videos.howstuffworks.com/air-conditioner-video.htm How Air Conditioners Work].

*[http://videos.howstuffworks.com/air-conditioner-video.htm How Air Conditioners Work] {{Webarchive|url=https://web.archive.org/web/20080718204018/http://videos.howstuffworks.com/air-conditioner-video.htm |date=2008-07-18 }}.

*[http://www.nyc.net.au/node/149398 History of Automotive Air Conditioning] on NYC.net

*[http://www.nyc.net.au/node/149398 History of Automotive Air Conditioning] {{Webarchive|url=https://web.archive.org/web/20160111133623/http://www.nyc.net.au/node/149398 |date=2016-01-11 }} on NYC.net

*[https://www.fantastichome.in/top-10-ac-in-india-june-2020/ Top 10 ac in india june 2020]

*[https://www.fantastichome.in/top-10-ac-in-india-june-2020/ Top 10 ac in india june 2020] {{Webarchive|url=https://web.archive.org/web/20200604081708/https://www.fantastichome.in/top-10-ac-in-india-june-2020/ |date=2020-06-04 }}

===Energy Efficiency===

===Energy Efficiency===

*[http://www.eca.gov.uk UK Enhanced Capital Allowance Scheme (ECA)], a UK Government scheme to provide tax rebates for companies who use products which are ECA approved.

*[http://www.eca.gov.uk UK Enhanced Capital Allowance Scheme (ECA)], a UK Government scheme to provide tax rebates for companies who use products which are ECA approved.

*[http://www.ecbcs.org International Energy Agency - Energy Conservation In Buildings And Community Systems]

*[http://www.ecbcs.org International Energy Agency - Energy Conservation In Buildings And Community Systems]

*[http://www.cooloff.org/ AHAM website on Room-air Conditioners]

*[http://www.cooloff.org/ AHAM website on Room-air Conditioners] {{Webarchive|url=https://web.archive.org/web/20060623054307/http://www.cooloff.org/ |date=2006-06-23 }}

*[http://www.aceee.org/consumerguide/topcac.htm Top-Rated Energy-Efficient Central Air Conditioners]

*[http://www.aceee.org/consumerguide/topcac.htm Top-Rated Energy-Efficient Central Air Conditioners]

*[http://www.energystar.gov/index.cfm?c=cac.pr_central_ac Energy Star Central Air Conditioners]

*[http://www.energystar.gov/index.cfm?c=cac.pr_central_ac Energy Star Central Air Conditioners]

*[http://doityourself.com/aircond/index.shtml How to lower the energy usage of central air conditioning]

*[http://doityourself.com/aircond/index.shtml How to lower the energy usage of central air conditioning] {{Webarchive|url=https://web.archive.org/web/20060410125432/http://doityourself.com/aircond/index.shtml |date=2006-04-10 }}

[[Category:Engineering]]

[[Category:Engineering]]