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English: An air conditioning unit: The coils and pipes in an air conditioning unit contain refrigerant gas. The refrigerant gas enters the compressor as warm, low-pressure gas and leaves it as hot, high-pressure gas. In the condenser coils, hot, compressed refrigerant gas loses heat to the outdoor air and becomes liquid while it is still warm.
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The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]
File:Hong Kong Railway Route Map en.svg → File:Hong Kong Railway Route Map en.pdf For more information about PDF, read about Portable Document Format and PDF to image files . čeština ∙ English ∙ español ∙ français ∙ 日本語 ∙ македонски ∙ português do Brasil ∙ slovenščina ∙ 中文（简体） ∙ 中文 ...
GREE Electric's Chairwoman is Dong Mingzhu, or "Sister Dong" as she is known in China. [2] She was appointed CEO in 2009. [citation needed] She joined the company in 1990.[citation needed] Dong was also the Chairwoman of its largest shareholder at the time, GREE Group, until November 2016. [8]
An air conditioning system, or a standalone air conditioner, provides cooling and/or humidity control for all or part of a building. Air conditioned buildings often have sealed windows, because open windows would work against the system intended to maintain constant indoor air conditions.
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