Upon arrival, inspected system and tested performance and found the system was only heating house with heat pumped by approximately 15° after inspecting airflow, found it on medium heat speed adjusted speed on high allowing approximately 1200 CFM for system. After adjustments, Delta T had rise by approximately 6°. Checked refrigerant pressures and found no major concerns having 388 on liquid and 128 on suction. Will need a return visit to compare numbers.