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  2. Carrier Global - Wikipedia

    en.wikipedia.org/wiki/Carrier_Global

    As of 2022, it was a $20.4 billion company with over 52,000 employees serving customers in 160 countries on six continents. [2] [3] Carrier was acquired by United Technologies in 1979, but it was spun off as an independent company 41 years later in 2020, as was the Otis Elevator Company. [4] [5]

  3. Friedrich Air Conditioning - Wikipedia

    en.wikipedia.org/wiki/Friedrich_Air_Conditioning

    By 1950, the company was a large manufacturer of commercial refrigeration equipment. It entered the relatively new field of air conditioning in 1952 with its first window air conditioning units. The company is credited with several innovations, including introducing the first refrigerated display case for food retailers.

  4. 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]

  5. Lennox International - Wikipedia

    en.wikipedia.org/wiki/Lennox_International

    In 1904, DW Norris acquired the company. He managed the company until his death in 1949. [3] From 1964 to 1965, Lennox produced a small crawler tractor and mower called the Lennox Kitty Track 600. It featured a 6 hp (4.5 kW) Briggs & Stratton engine and a 32" mower deck. [4] In 1999, the company became a public company via an initial public ...

  6. Heating, ventilation, and air conditioning - Wikipedia

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

    Air conditioning and refrigeration are provided through the removal of heat. Heat can be removed through radiation, convection, or conduction. The heat transfer medium is a refrigeration system, such as water, air, ice, and chemicals are referred to as refrigerants.

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