A/C and  Heat-Pump Systems using R 22 refrigerant for  A/C  have been phased out. The  minimum efficiency was increased from 10 seer to 13 seer.
They  have been replaced with systems  that use a new refrigerant ( R-410a )with names like Puron and Prozone.

Did you know that a 13 SEER A/C system is 30% more efficient than the old 10 SEER systems  that were the minimum allowed used since 1992?