For decades now, refrigerators and air conditioners have largely run on compressors that can be quite noisy and a compound that can deplete the ozone. Replacing both would be a feat if it can be done just as cheaply.

via Forbes – Energy http://www.forbes.com/sites/uciliawang/2013/12/17/a-novel-heat-pump-designed-to-chill-your-beer-and-wine/