Technician arrived to customers home and talked to homeowners Das and asked a couple of questions, after Technician asked where units and thermostat where located and then grabbed tools and started in 1st unit in attic. Technician took electrical readings and checked plenums aswell as checking filter which customer did not have filters to change and Technician told him size of filter so they can order and change. Technician then took pics of everything like coil blower wheel and other. Technician then moved to 2nd air handler in upstairs aswell as taking electrical readings and checking plenums gas line all in good condition, technician did see that filter needed change but again customer did not have filters for Technician to change. Technician then moved to outside condenser and started washing both units, after Technician waxed both condenser units and hooked gauges on both units, refrigerant levels all in range aswell as temperature split all good. Technician took capacitor reading