Editing Heat pump (section)

==Types==

===Air-source===
{{Excerpt|Air source heat pump}}

===Ground source===
{{Excerpt|Ground source heat pump}}

=== Heat recovery ventilation ===
{{Main|Heat recovery ventilation}}
Exhaust air heat pumps extract heat from the exhaust air of a building and require [[Ventilation (architecture)|mechanical ventilation]]. Two classes exist:
* Exhaust air-air heat pumps transfer heat to intake air.
* Exhaust air-water heat pumps transfer heat to a heating circuit that includes a tank of domestic hot water.

=== Solar-assisted ===
{{Excerpt|Solar-assisted heat pump}}

===Water-source===
[[File:Pond Loop Being Sunk.jpg|thumb|upright=1.4|Water-source heat exchanger being installed]]

A [[water-source heat pump]] works in a similar manner to a ground-source heat pump, except that it takes heat from a body of water rather than the ground. The body of water does, however, need to be large enough to be able to withstand the cooling effect of the unit without freezing or creating an adverse effect for wildlife.<ref>{{Cite web |last=Energy Saving Trust |date=2019-02-13 |title=Could a water source heat pump work for you? |url=https://energysavingtrust.org.uk/could-water-source-heat-pump-work-you/ |url-status=live |archive-url=https://web.archive.org/web/20221004170847/https://energysavingtrust.org.uk/could-water-source-heat-pump-work-you/ |archive-date=2022-10-04 |access-date=2022-10-04 |website=Energy Saving Trust |language=en-GB}}</ref> The largest water-source heat pump was installed in the Danish town of Esbjerg in 2023.<ref name="Baraniuk 2023 g296">{{cite web | last=Baraniuk | first=Chris | title=The 'exploding' demand for giant heat pumps | website=BBC News | date=2023-05-29 | url=https://www.bbc.com/news/business-65321487 | access-date=2023-09-19 | archive-date=2023-09-07 | archive-url=https://web.archive.org/web/20230907053141/https://www.bbc.com/news/business-65321487 | url-status=live }}</ref><ref name="Ristau 2022 i239">{{cite web | last=Ristau | first=Oliver | title=Energy transition, the Danish way | website=DW | date=2022-07-24 | url=https://www.dw.com/en/danish-port-city-to-play-key-role-in-europes-wind-energy-plans/a-62464055 | access-date=2023-09-19 | archive-date=2023-08-09 | archive-url=https://web.archive.org/web/20230809045025/https://www.dw.com/en/danish-port-city-to-play-key-role-in-europes-wind-energy-plans/a-62464055 | url-status=live }}</ref>

=== Others===
A thermoacoustic heat pump operates as a [[thermoacoustic heat engine]] without refrigerant but instead uses a standing wave in a sealed chamber driven by a loudspeaker to achieve a temperature difference across the chamber.<ref>{{Cite web |first=Karmela |last=Padavic-Callaghan |date=6 December 2022 |title=Heat pump uses a loudspeaker and wet strips of paper to cool air |url=https://www.newscientist.com/article/2349973-heat-pump-uses-a-loudspeaker-and-wet-strips-of-paper-to-cool-air/ |access-date=2023-01-04 |website=New Scientist |language=en-US |archive-date=2023-01-04 |archive-url=https://web.archive.org/web/20230104132907/https://www.newscientist.com/article/2349973-heat-pump-uses-a-loudspeaker-and-wet-strips-of-paper-to-cool-air/ |url-status=live }}</ref>

Electrocaloric heat pumps are solid state.<ref>{{Cite web |last=Everitt |first=Neil |date=2023-08-14 |title=Scientists claim solid-state heat pump breakthrough |url=https://www.coolingpost.com/world-news/scientists-claim-solid-state-heat-pump-breakthrough/ |access-date=2023-09-17 |website=Cooling Post |language=en-GB |archive-date=2023-09-24 |archive-url=https://web.archive.org/web/20230924115904/https://www.coolingpost.com/world-news/scientists-claim-solid-state-heat-pump-breakthrough/ |url-status=live }}</ref>