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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. 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]

4. List of obsolete occupations - Wikipedia

   en.wikipedia.org/wiki/List_of_obsolete_occupations

   A knocker-up's job was to rouse sleeping people so they could get to work on time. A knocker-up was often employed to wake up workers on shifts, particularly in factory areas, but was also sometimes self-employed. [72]: 164 As alarm clocks became less expensive and more reliable, there was no longer a need to pay a knocker-up. [118] [119] Tech ...

5. 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 ...

6. 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 ...

7. List of construction trades - Wikipedia

   en.wikipedia.org/wiki/List_of_construction_trades

   Among the construction trades, in most industrialized countries, each has a distinct 2-5 year craft apprenticeship education and usually once started a worker remains in a single craft and progresses through ranks of skill for the duration of their career (pre-apprentice, apprentice, and journeyman; some countries include a post-journeyman ...