Performed 2 system cooling maintenance. I checked amps, capacitors, filters, electrical, drains, safeties, cleanliness, temperature split, and ducts. The systems are both cooling great. However, the ducts has had some major damage caused by critters. The supply plenum has been eaten through by approximately 80%. There are multiple ducts that have had their insulation eaten exposing the inner liner. There are ducts that have had the inner liner punctured and deemed not repairable. I provided pricing to patch what we can with a roll of insulation and flex tape, replace a 5” and 9” duct on the upstairs unit, and replace the plenum on the upstairs unit.