Following are the properties of a Refrigerant -

1. Low boiling point
2. Low condensing pressure
3. Low specific heat
4. High specific enthalpy of vaporization
5. High critical temperature
6. Non corrosive and non solvent
7. Non toxic and no action with oil
8. East to leak detection
9. Non flammable and non corrosive
10. Stable under working condition
11. Cheap, easily started and obtained