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2. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   In general, heat pumps work most efficiently (that is, the heat output produced for a given energy input) when the difference between the heat source and the heat sink is small. When using a heat pump for space or water heating, therefore, the heat pump will be most efficient in mild conditions, and decline in efficiency on very cold days.

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

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

   Why does my heat pump blow cold air? A heat pump provides cool air in the summer and heat in winter. In cooling mode, a heat pump works like a refrigerator, using a refrigerant to cool hot air ...

4. Heat pump and refrigeration cycle - Wikipedia

   en.wikipedia.org/wiki/Heat_pump_and...

   Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pump, air conditioning and refrigeration systems. [1] A heat pump is a mechanical system that transmits heat from one location (the "source") at a certain temperature to another location (the "sink" or "heat sink") at a higher temperature. [2]

5. Central heating - Wikipedia

   en.wikipedia.org/wiki/Central_heating

   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. In colder climates, geothermal heat pumps can be used to extract heat from the ground ...

6. Heat pumps: How do they work and how do I get one? - AOL

   www.aol.com/heat-pumps-one-101310806.html

   The financial support to help households replace their gas boilers with heat pumps is increasing.

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

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

   Weather. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us. Sign in. ... Heat pumps work very differently to other sources such as gas-powered boilers or electric heaters.