For this cooling tune-up I inspected the customers furnace, evaporator coils and condensers for the upstairs and downstairs systems. Overall both systems were running well and all equipment is measuring within manufacturer specs. There is a large amount of biological growth in both supply plenums, I highly recommend replacing the UV Bulb in the downstairs system, as well as installing a UV Sanitation System in the upstairs supply plenum to kill the current biological growth in the plenum and continue to purify the air circulating throughout the home. Please have Shaun come out March 28th to look over the customers tankless water heater as It appears there is corrosion on fittings and connections, and water sitting in the drain pan. There is no water safety to alert the customer of any leaks from the tankless water heater.