Arrived to do a performance maintenance. Set system for cooling. Measured the systems static pressure and measured a temperature split between return and supply air. Found that the system is operating with excessive static pressure. Checked interior of the furnace for cleanliness. Found large hot spots on the heat exchanger. This is caused by poor airflow due to the systems static pressure. Went outside and verified refrigerant levels. Verified operation of all electronic and mechanical components. Rinsed coil free of debris. Spoke with homeowner about the system. Air conditioning system is operational at this time.