Performed maintenance on both inverter systems. All electrical and mechanical components are functioning as designed. Inspected inside ductwork and it's very clean for both return and supply. Unit only sweats at certain times and in small sections of the air handler; I explained why this occurs to the homeowner. Both systems use a 21x21x5 air filter and I changed both. Cleared both condensate lines using water pressure. Cleaned off algae that was growing on both pads. Cleaned both units. Ductwork was replaced recently.