Performed 1 system diagnostic for main/ upstairs unit. Found unit frozen, unit has rusted coil, dirty blower wheel, low on charge, failed capacitors inside and out, pitted contactor. Due to the age of unit and nature of failures recommend replacing system. Options for repairs are not available due to the type of refrigerant. Unit is non operational. Based on our findings today, it might be time to think about getting a brand new system.