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Aheatpumpisadevicethatprovidesheatenergyfromasourceofheattoadestinationcalleda"heatsink".Heatpumpsaredesignedtomovethermalenergyoppositetothedirectionofspontaneousheatflowbyabsorbingheatfromacoldspaceandreleasingittoawarmerone.Aheatpumpusessomeamountofexternalpowertoaccomplishtheworkoftransferringenergyfromtheheatsourcetotheheatsink.Whileairconditionersandfreezersarefamiliarexamplesofheatpumps,theterm"heatpump"ismoregeneralandappliestomanyHVAC(heating,ventilating,andairconditioning)devicesusedforspaceheatingorspacecooling.Whenaheatpumpisusedforheating,itemploysthesamebasicrefrigeration-typecycleusedbyanairconditionerorarefrigerator,butintheoppositedirection-releasingheatintotheconditionedspaceratherthanthesurroundingenvironment.Inthisuse,heatpumpsgenerallydrawheatfromthecoolerexternalairorfromtheground. Inheatingmode,heatpumpsarethreetofourtimesmoreefficientintheiruseofelectricpowerthansimpleelectricalresistanceheaters.Typicallyinstalledcostforaheatpumpisabout20timesgreaterthanforresistanceheaters. 
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