Arrived at customer's house for 3 unit system inspection. On arrival customer showed me to air handler units. Started with air handler in laundry closet. Air handler was equipped with UV light. UV light is within dropper date. Inside cabinet is clean. Under evaporator coil is clean. Unit is producing proper Delta T periodrain safety is currently working. Next went to 2 air handlers and upstairs. Checked under both evaporator coils and under both evaporator coils were clean. Both units are equipped with UV lights that have bulbs in acceptable date. Open both air handler cabinets and blower wheels were clean. Tops of evaporator coils were clean. Both units were producing proper Delta T. Both units drained safeties were currently working. Next went outside to condensers. No condensers are equipped with surge protectors. With these units being by water and risen on a porch they are More prone to lightning strikes And electric surges. 2 units are inverters, and one is a standard unit