I was amused to see an announcement of a thermoacoustic heat pump the other day:
https://www.pv-magazine.com/2023/01/02/residential-thermo-acoustic-heat-pump-produces-water-up-to-80-c/ then an ionocaloric refrigerator announcement turns up this morning https://newscenter.lbl.gov/2023/01/03/cool-new-method-of-refrigeration/ It seems that you won't recognize your air conditioner in a few years. -- rec --
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