This is a tough question.
First, in terms of the CO2 refrigerants used in heat pump water heaters, there is a good affinity between these refrigerants and the equipment, and these products are being developed all the time. Equipment that combines heat pumps for cooling and heating and water heaters are being developed as well.
CO2 is also starting to be used in some cooling-only vending machines, and it has become clear that, with some innovation and fine-tuning, it is possible to create CO2 equipment that consumes less power than conventional equipment. There is also the potential for CO2 to be used in many other types of equipment, with some innovation and fine-tuning, and a number of companies are working on such development.
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