Upon arrival started ac tune up. Inspected indoor unit. It was extraordinarily dirty. Filter was super restricted. Condensate lines were about to overflow. Flushed out drain lines and cleaned out blower compartment with compressed air. Replaced filter. Checked outdoor unit. Unit is older. All motor amps are within range at this time. Refrigerant charge is okay. Unit is not the most efficient but still cooling. Cleaned out condenser coils and bottom of condenser. Cleaned out electrical. Tested start components. Inspected ducting. Ducting is older but no major leaks at this time. Unit is operational upon departure.