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Heat pump uses a loudspeaker and wet strips of paper to cool air [newscientist.com]:

A heat pump that uses sound to cool [newscientist.com] is three times as efficient as previous designs.

Heat pumps cool buildings by removing heat from the inside and pushing it outside, like a refrigerator. But unlike a refrigerator, they can also heat an enclosed area by reversing the process. To top it off, heat pumps are typically more efficient than conventional heating and cooling devices.

Guy Ramon [technion.ac.il] at Technion – Israel Institute of Technology in …

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