Arrived to remedy a system that’s unable to keep up in the heat. Upon arrival set system to cooling and system started up as designed. Performed diagnostic on the inside portion and found that the system is operating with a 20 degree split. This is all we ask of air conditioning systems but with how hot it is in the home this can be achieved without proper operation. Went outside and continued diagnostic. Refrigerant levels appear to be where they need to be and electronic components are functioning properly. Went back inside and double checked airflow. Found that when the system was installed the airflow was adjusted but were not set on the correct setting. Made the proper adjustment to the fan speed and checked the refrigerant levels. Calibrated system charge to meet the proper airflow. System is still cooling more than 20 degrees and is handling humidity more efficiently.