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  2. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    The efficiency of air conditioners is often rated by the seasonal energy efficiency ratio (SEER), which is defined by the Air Conditioning, Heating and Refrigeration Institute in its 2008 standard AHRI 210/240, Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump Equipment. [61]

  3. Ton of refrigeration - Wikipedia

    en.wikipedia.org/wiki/Ton_of_refrigeration

    Just as horsepower and candlepower were intuitive units of measure for people living through the transition from horse to steam power [3] and from flame-based to electric lighting, so was the ton of refrigeration an intuitive unit of measure during a technological change, as the ice trade gradually included growing percentages of artificial ice ...

  4. Compact fluorescent lamp - Wikipedia

    en.wikipedia.org/wiki/Compact_fluorescent_lamp

    Using average U.S. commercial electricity and gas rates for 2006, a 2008 article found that replacing each 75 W incandescent lamp with a CFL resulted in yearly savings of $22 in energy usage, reduced HVAC cost, and reduced labour to change lamps. The incremental capital investment of $2 per fixture is typically paid back in about one month.

  5. Rail transport - Wikipedia

    en.wikipedia.org/wiki/Rail_transport

    A train in Alaska transporting crude oil in March 2006. Rail transport (also known as train transport) is a means of transport using wheeled vehicles running in tracks, which usually consist of two parallel steel rails. [1]

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