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2. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   An HVAC technician is a tradesman who specializes in heating, ventilation, air conditioning, and refrigeration. HVAC technicians in the US can receive training through formal training institutions, where most earn associate degrees .

3. List of construction trades - Wikipedia

   en.wikipedia.org/wiki/List_of_construction_trades

   HVAC Technician, specializes in service and repair of air conditioning, heating, and refrigeration systems. Insulation installer. Includes application of all insulating materials, protective coverings, coatings and finishes to all types of mechanical systems. Also Hazardous Material Handler (for HazMat see Laborer).

4. Air conditioning - Wikipedia

   en.wikipedia.org/wiki/Air_conditioning

   At the same time, the fan is slowed to reduce the evaporator temperature and condense more water. A dehumidifier uses the same refrigeration cycle but incorporates both the evaporator and the condenser into the same air path; the air first passes over the evaporator coil, where it is cooled [ 52 ] and dehumidified before passing over the ...

5. Refrigeration - Wikipedia

   en.wikipedia.org/wiki/Refrigeration

   Commercial refrigeration. Refrigeration is any of various types of cooling of a space, substance, or system to lower and/or maintain its temperature below the ambient one (while the removed heat is ejected to a place of higher temperature). [1] [2] Refrigeration is an artificial, or human-made, cooling method. [1] [2]

6. Dictionary of Occupational Titles - Wikipedia

   en.wikipedia.org/wiki/Dictionary_of_Occupational...

   The Dictionary of Occupational Titles was first published in 1938 and "emerged in an industrial economy and emphasized blue-collar jobs. Updated periodically, the DOT provided useful occupational information for many years. But its usefulness waned as the economy shifted toward an information and services and away from heavy industry."

7. List of professional designations in the United States

   en.wikipedia.org/wiki/List_of_professional...

   Obtaining a certificate is voluntary in some fields, but in others, certification from a government-accredited agency may be legally required to perform certain jobs or tasks. Organizations in the United States involved in setting standards for certification include the American National Standards Institute (ANSI) and the Institute for ...