Arkansas HVAC
HVAC (pronounced either "H-V-A-C" or, occasionally, "aitch-vak") is an initialism/acronym that stands for "heating, ventilation, and air conditioning". HVAC is sometimes referred to as "climate control" and is particularly important in the design of medium to large industrial and office buildings such as sky scrapers and in marine environments such as aquariums, where humidity and temperature must all be closely regulated whilst maintaining safe and healthy conditions within. Refrigeration is sometimes added to the field's abbreviation as HVAC&R or HVACR, or ventilation is dropped as HACR.
Heating, ventilation, and air conditioning is based on the basic principles of thermodynamics, fluid mechanics, and heat transfer, and to inventions and discoveries made by Michael Faraday, Willis Carrier, Reuben Trane, James Joule, William Rankine, Sadi Carnot, and many others. The invention of the components of HVAC systems goes hand-in-hand with the industrial revolution, and new methods of modernization, higher efficiency, and system control are constantly introduced by companies and inventors all over the world.
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Several global companies are headquartered in the northwest corner of Arkansas, including Wal-Mart (the world's largest public corporation by revenue in 2007), J.B. Hunt and Tyson Foods. This area of the state has experienced an economic boom since the 1970s as a result.
In recent years, automobile parts manufacturers have opened factories in eastern Arkansas to support auto plants in other states. Additionally, the city of Conway is the site of a school bus factory.
Tourism is also very important to the Arkansas economy; the official state nickname "The Natural State" was originally created (as "Arkansas Is A Natural") for state tourism advertising in the 1970s, and is still regularly used to this day.
