2006 Lennox AC running in good condition despite age. 16x25x1 air filter in good condition. Visual inspection of indoor coil. Flush drain pan and drain lines. Humidifier damper is closed. Run test unit in cooling mode from thermostat. Delta t of 21F with supply temp of 49F. R-22 refrigerant pressures are within spec. High 185psi with 9F SC, low 60psi with 24F SH. Piston metering device. Dual run capacitortested within operating spec. Fan motor and compressor are operating within Amp draw specifications. System is operational with no issues found. Due to the age of the unit, it is possible that components such as the compressor could fail at any time.