You probably would encounter people telling you about R22 or R410A.
Comparison R410A over R22?
What most people know about R410A
1) it is environmental friendly*
2) more efficent thus lower electrical bills
3) able to cool faster using less energy**
*not entirely environmental friendly as R410A still has a high Global Warming Potential.
** contributes certain percentage to the improvement but most credit should be attribute to the improvement in technology.
