Arrived for ac check today. Started at furnace and checked static pressure, it is failing. Motors amps are almost at max. Evaporator coil is collecting dust and blocking airflow. Heat exchanger is rusting in spots and developing hot spots. Ducts are dirty. There is 20 degree temp split. At the condensing unit pressures and charge look a little low. There have been a new fan motor and contactor put on. I rinsed coil clean. My field supervisor is to discuss options. Thanks for choosing LBA.