The objective of this book is to explain an eco-friendly refrigerant mixture with negligible ODP and decreased GWP values that are nearly equivalent to R134a in its performance.The proposed ternary mixture seems to be an appropriate long-term candidate to replace R134a from the viewpoint of an eco-friendly refrigerant mixture with zero ODP and low GWP values. It also has better performance than base refrigerants, requiring minimal changes in the existing refrigerators.