Upon arrival technician found that the system is working properly. With a 16 to 20° temp difference. System working properly at this time. The technician checked the filter, the filter is clean but the system seems like it could use another return to add airflow, The technician checked the drain lines and found that there is no clog in the drain lines. The technician checked the refrigerant and found that the refrigerant falls in the perfect specifications. The technician found no issues with this system.