| In ordinary conversation, when the term
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| | substance that alters the temperature of
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| air conditioning is mentioned, people
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| | the air. In the early stages of its
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| automatically take it to mean cooling
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| | development, air conditioning units used
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| room temperature. Technically speaking,
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| | harmful gases such as ammonia and methyl
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| though, air conditioning is the process
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| | chloride as refrigerants. They were soon
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| of controlling room temperature through
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| | replaced by another type of chemical, the
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| various means that involve ventilation,
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| | patented substance called Freon.Freon is
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| heating and cooling. In construction, it
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| | safe for humans. However, it is harmful
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| is referred to as HVAC.In 1902, The New
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| | to the environment. When released into
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| York Stock Exchange was the very first
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| | the atmosphere, this chlorofluorocarbon
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| building to use air conditioning units
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| | gas is believed to be a contributing
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| that separately cooled and heated the
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| | factor to the thinning of the ozone
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| air. Later that year, Willis Havilland
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| | layer. Most air conditioning units sold
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| Carrier installed the very first
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| | today still use this type of gas,
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| electrically-run air conditioning unit at
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| | particularly the HCFC R-22. It is said
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| a printing plant. The unit not only
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| | that environmentalists will have to wait
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| cooled the air but also controlled the
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| | until 2010 to see the total eradication
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| humidity.In those times, air conditioning
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| | of HCFC R-22 in air conditioning
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| was mostly used in manufacturing
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| | untis.Air conditioning units have
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| facilities to improve products by
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| | different types of refrigeration cycles.
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| controlling the effects of humidity,
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| | The first type uses a heat pump that
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| thus, increasing employee productivity.
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| | drives out hot air from the room and
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| It was several decades later, in the
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| | blows in cooled air though a compressor.
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| 1950s, that homes and automobiles started
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| | The second type pumps in a refrigerant.
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| to be fitted with the air conditioning
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| | When the refrigerant evaporates, it takes
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| technology.An air conditioning unit cools
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| | with it the hot air and leaves cooled
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| the air through a refrigerant, a
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| | air.
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