Maintenance call for a 2011 Lennox ac system. The system is in fair shape but showing its age. Replaced the capacitor on the condenser today with a 5 year warranty. The compress Windings are in the caution zone and the system is missing a wet switch on the secondary port of the evaporator coil. Also the system is low on refrigerant and has been for a while now. Technician performed a duct sanitation on the system here today as well.