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  2. Forest Grove Sound - Wikipedia

    en.wikipedia.org/wiki/Forest_Grove_Sound

    However, after February 2016, the noise was not heard. The final point was plotted on Dawes' map on February 27, 2016, [4] and the police and fire departments closed the case. Dave Nemeyer, the Forest Grove Fire Marshal, suspected the noise to be "a faulty attic fan or heat pump." [10] [11]

  3. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    A heat pump is a device that consumes energy (usually electricity) to transfer heat from a cold heat sink to a hot heat sink. Specifically, the heat pump transfers thermal energy using a refrigeration cycle , cooling the cool space and warming the warm space. [ 1 ]

  4. Air source heat pump - Wikipedia

    en.wikipedia.org/wiki/Air_source_heat_pump

    An air source heat pump (ASHP) is a heat pump that can absorb heat from air outside a building and release it inside; it uses the same vapor-compression refrigeration process and much the same equipment as an air conditioner, but in the opposite direction. ASHPs are the most common type of heat pump and, usually being smaller, tend to be used ...

  5. How do heat pumps work? What to know about installation ... - AOL

    www.aol.com/news/heat-pumps-know-installation...

    For ductless heat pumps, the most popular in Minneapolis, it's $6,000 to $7,000 per house zone, while forced air heat pumps cost between $10,000 to $20,000, depending on the model. A traditional ...

  6. Fact check: Heat pumps move heat energy from outside to ... - AOL

    www.aol.com/fact-check-heat-pumps-move-152100263...

    The Government has written that a heat pump “generates 3 times more energy than it consumes”.. Evaluation. Heat pumps are highly efficient and can release three times as much heat energy into ...

  7. Are heat pumps the key to accelerating the energy transition?

    www.aol.com/news/heat-pumps-key-accelerating...

    According to Adams, since the manufacturing and installation process for ACs and heat pumps are almost the same, upgrading from an AC to a heat pump of the same model would only cost an extra $300 ...

  8. Absorption-compression heat pump - Wikipedia

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

    P-T Diagram showing the temperature gliding in binary heat pump. This behaviour increase the efficiency of ACHP Ammonia toxicity is the main drawback of ACHP. The main advantage with respect to compression heat pump is that the compression-absorption heat pumps allow the heat to be transfer with a temperature glide.

  9. Heating system - Wikipedia

    en.wikipedia.org/wiki/Heating_system

    Central heating systems: These systems produce heat in one central location and distribute it throughout the building. This category includes furnaces, boilers, and heat pumps. [1] [2] Distributed heating systems: These systems generate heat in the space they are to heat, without extensive duct systems. Examples include electric space heaters ...

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