A heat pump absorbs heat from an ambient temperature source and releases it to some warmer one. It employs an external supply, like air, the bottom or h2o, to transfer Electricity and it uses a fluid named a refrigerant to aid this process. CO2 heat pumps operate the same way, https://high-temperature-heat-pum92479.blogspothub.com/30512146/how-much-you-need-to-expect-you-ll-pay-for-a-good-heat-pumps