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  2. Air mattress - Wikipedia

    en.wikipedia.org/wiki/Air_mattress

    An air mattress, also known as an airbed or a blow-up bed, [2] is an inflatable mattress made of polyvinyl chloride (PVC) or textile-reinforced urethane plastic or rubber. The deflated mattress can be compacted and carried or stored in a small form. They are inflated by blowing into a valve, either with a manual or an electric pump. Some are ...

  3. Rheem Manufacturing Company - Wikipedia

    en.wikipedia.org/wiki/Rheem_Manufacturing_Company

    In 2009, Rheem and Ruud were the first to sell a Hybrid Heat Pump Water Heater, which was more than twice as efficient as similar electric water heaters. [25] Also in the same year, Rheem and Ruud central air conditioners were reported to have the fewest percentage of units requiring repair among all major HVAC brands according to Consumer Reports.

  4. These are the best dog bed deals our editors are loving this ...

    www.aol.com/best-dog-bed-deals-editors-085753114...

    These dog beds are at the top of my list this Amazon Prime Day. Whether you’re getting a dog for the first time or your pooch’s bed is in need of an upgrade, this is the perfect time to grab a ...

  5. Heating, ventilation, and air conditioning - Wikipedia

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

    Electrical heaters are often used as backup or supplemental heat for heat pump systems. The heat pump gained popularity in the 1950s in Japan and the United States. [14] Heat pumps can extract heat from various sources, such as environmental air, exhaust air from a building, or from the ground. Heat pumps transfer heat from outside the ...

  6. Absorption-compression heat pump - Wikipedia

    en.wikipedia.org/wiki/Absorption-compression...

    The main difference between the two is in the compression phase: where the compression heat pump uses an electric compressor, the gas-driven absorption heat pump uses a thermal compressor. [12] The ACHP is obtained by combining the components that are in common and using the electric and thermal compressor in parallel or in series.

  7. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    The main heat sources were lake water, river water, groundwater, and waste heat. Particularly noteworthy are the six historic heat pumps from the city of Zurich with heat outputs from 100 kW to 6 MW. An international milestone is the heat pump built by Escher Wyss in 1937/38 to replace the wood stoves in the City Hall of Zurich.