Editing Active cooling (section)

=== Heat pumps ===
{{Main|Heat pump}}

A heat pump utilizes electricity in order to extract heat from a cool area into a warm area, causing the cool area to lower in temperature and the warm area to increase in temperature.<ref>{{Cite web|title=Heat Pump Systems|url=https://www.energy.gov/energysaver/heat-and-cool/heat-pump-systems|access-date=2020-11-11|website=Energy.gov|language=en}}</ref>

There are two types of heat pumps:<ref>{{Cite book|last=Lechner|first=Norbert|url=https://books.google.com/books?id=WjetCwAAQBAJ&pg=PR11|title=Heating, Cooling, Lighting: Sustainable Design Methods for Architects|date=2014-10-13|publisher=John Wiley & Sons|isbn=978-1-118-58242-8|language=en}}</ref>

==== Compression heat pumps ====
Being the more popular variant of the two, compression heat pumps operates through the use of the refrigerant cycle. The vapor refrigerant in the air gets compressed while increasing in temperature, creating a superheated vapor. The vapor then goes through a condenser and converts into a liquid form, dispelling more heat in the process. Traveling through the expansion valve, the liquid refrigerant forms a mixture of liquid and vapor. As it passes through the evaporator, vapor refrigerant forms and expels into the air, repeating the refrigerant cycle.

==== Absorption heat pumps ====
The process for the absorption heat pump works similarly to the compression variant with the main contrast being the usage of an absorber instead of a compressor. The absorber takes in the vapor refrigerant and creates a liquid form which then travels into the liquid pump to be turned into superheated vapor. The absorption heat pump utilizes both electric and heat for its functionality compared to compression heat pumps which only uses electricity.<ref name=":0" />