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  2. Air conditioning - Wikipedia

    en.wikipedia.org/wiki/Air_conditioning

    The heat pump is significantly more energy-efficient than electric resistance heating, because it moves energy from air or groundwater to the heated space and the heat from purchased electrical energy. When the heat pump is in heating mode, the indoor evaporator coil switches roles and becomes the condenser coil, producing heat.

  3. Metrication in the United States - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    Fuel prices are mostly given in customary units, such as dollars per gallon, barrel, thousand cubic feet, or ton (short or long). Heating, cooling, and combustion are often measured in BTUs per hour or refrigeration tons , and powerplant efficiency is often measured by its "heat rate", in BTU per kilowatt hour.

  4. January–March 2023 in science - Wikipedia

    en.wikipedia.org/wiki/January–March_2023_in...

    The most affordable carbon capture and conversion system to date, bringing the cost down to just $39 per metric ton, is revealed. The process takes flue gas from power plants, uses a solvent to strip out the CO 2, then converts it to industrially-useful methanol. [122] [123]

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