Performed AC maintenance on a Lennox system. Cooling temperature split is over 20 degrees. Blower motor is clean and amping ok. Filter was dirty and replaced today with a upgraded merv 16. Customer provided. Condensate line is clear. Outdoor unit was dirty and chemically washed. Compressor bay and service panel was cleaned. Refrigerant levels are ok. Compressor and fan amp draws are in range. Electrical components show minor signs of wear at thus time. Indoor and outdoor units are not protected, system was running at end of appointment.