Upon arrival to the scheduled system maintenance, I was shown to the a/h unit in the closet. Immediately pulled off panel doors to inspect all electrical components connections, collect amp draw/voltage readings off electrical equipment, and check the evaporator coil for cleanliness. The a/h unit is not equipped with a UV light system and the evaporator coil is clean, as well as the cabinet and electrical components. All connections are secure and amp draw/voltage readings are within range of factory specifications. The d/t had a temperature difference of 18° and within normal range. I then went outside to the side of the home to verify the system refrigerant charge, inspect all electrical components connections, collect amp draw/voltage readings, and clear the condensate drain line. All electrical components connections are secure and running within range of factory specifications. The outdoor unit is not equipped with a surge protector. I recommend installing a surge protector in