Natural refrigerants are substances that exist naturally in the environment. With very low or zero global warming potential (GWP) and zero ozone depletion potential (ODP) they are considered the absolute solution of the environmental damage caused by synthetic refrigerants. The most widespread natural refrigerants used in HVAC/R applications are carbon dioxide (CO2, R-744), hydrocarbons such as propane (R-290), isobutene (R-600a), and propylene (R-1270), and ammonia (NH3, R-717). Other natural refrigerants are water (H2O, R-718) and air (R-729), used only for special applications, or sulfur dioxide (SO2) and methyl chloride (CH3Cl), which are no longer used.
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