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For anyone who read the article completely lost like I was: https://clade-es.com/heat-pumps/about-co2-heat-pumps/ https://clade-es.com/heat-pumps/about-co2-heat-pumps/ “ A CO2 heat pump uses carbon dioxide as a refrigerant. Carbon dioxide is a naturally occurring gas, and it has a very low boiling point. This makes it ideal for use in a heat pump. When the carbon dioxide is compressed, it becomes a liquid. This liquid then evaporates, and as it does so, it absorbs heat from the surrounding air.”