One system hvac tune up in Buford Georgia. Main level system. Changed filter. Tested mechanical and electrical components. Found evaporator coil to be rusted and corroded and likely to leak. System runs on R22 which is a refrigerant that has been phased out by the epa. System is from 2008. Due to age, condition, and lack of efficiency, recommend upgrading system to a more reliable and more efficient system. System is operating at this time.