Performed semiannual maintenance on one straight cool AC system. Inspected all performance, mechanical and safety systems. I did test airflow while onsite and found the airflow to be lower than required for the 4 ton AC system. I adjusted airflow to the proper speed to ensure that both heat and humidity is removed from inside the home during runtime of the unit. The slower airflow was causing higher temperature delta as well as the exterior of the case coil cabinet to sweat inside the closet outside. Tested and verified everything was operating within manufacturer specifications for operation. No other major issues were found. Everything is working at this time.