- Ammonia (NH₃) Refrigerants – R-717: High efficiency, zero GWP, used in industrial cooling
- Carbon Dioxide (CO₂) Refrigerants – R-744: Low GWP, used in commercial refrigeration
- Hydrocarbons (HCs) Refrigerants – e.g., R-290 (Propane), R-600a (Isobutane): Low GWP, used in household refrigerators
- Blends Refrigerants
- Mixtures of two or more refrigerants to achieve desired properties
- e.g., R-407C, R-508B
