2 ms·

I guess supercritical CO2 can be a decent refrigerant as well. https://www.greenbuildingadvisor.com/article/a-heat-pump-using-carbon-dioxide-as-the-refrigerant

• jabl 7y ago
  AFAIU it's quite common in supermarket/warehouse refrigerators and freezers. Apparently upfront cost is slightly higher, but the refrigerant is cheap and there's no risk the next iteration of the F gas legislation will make your investments a dead end. And of course the environment friendliness is important to businesses that are concerned about their image.