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  2. Freeze stat - Wikipedia

    en.wikipedia.org/wiki/Freeze_stat

    Air coil freeze stat. A freeze stat is a temperature sensing device for HVAC that monitors a heat exchanger to prevent its coils from freezing.Freeze stats can be used on both refrigerant-to-air, and refrigerant-to-liquid type heat exchangers and serve different purposes with similar goals for each.

  3. Air source heat pump - Wikipedia

    en.wikipedia.org/wiki/Air_source_heat_pump

    The outdoor unit of an air source heat pump operating in freezing conditions Operation of normal ASHPs is generally not recommended below −10 °C. [ 24 ] However, ASHPs designed specifically for very cold climates (in the US, these are certified under Energy Star [ 25 ] ) can extract useful heat from ambient air as cold as −30 °C (−22 ...

  4. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    Effective immediately, American households are eligible for a tax credit to cover the costs of buying and installing a heat pump, up to $2,000. Starting in 2023, low- and moderate-level income households will be eligible for a heat-pump rebate of up to $8,000. [107] In 2022, more heat pumps were sold in the United States than natural gas furnaces.

  5. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    External heat exchanger of an air source heat pump. An air source heat pump can be used to air condition the building during hot weather, and to warm the building using heat extracted from outdoor air in cold weather. Air-source heat pumps are generally uneconomic for outdoor temperatures much below freezing.

  6. How to Fix Your Frozen Pipes, According to Experts - AOL

    www.aol.com/keep-pipes-freezing-winter-according...

    Drastically dropping the temperature in your home between the night and day can leave your pipes more prone to freezing than they would be if you leave your heat on (anywhere over 55 degrees ...

  7. Direct exchange geothermal heat pump - Wikipedia

    en.wikipedia.org/wiki/Direct_exchange_geothermal...

    DX system being drilled in the 1980s. A direct exchange (DX) geothermal heat pump is a type of ground source heat pump in which refrigerant circulates through copper tubing placed in the ground unlike other ground source heat pumps where refrigerant is restricted to the heat pump itself with a secondary loop in the ground filled with a mixture of water and anti-freeze.

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