Two system super tune up performed today. Both systems are 3 year old carrier heat pumps. All electrical connections are tight with no corrosion. Biological growth is present inside of both air handlers. Suggest a UV germicidal system in each unit to help with the air quality. Refrigerant levels are in range. Heat strips are pulling proper amperage. Defrost control boards and reversing valves are working properly. Outdoor units were washed and waxed.