Performed heating maintenance on three systems. Two heat pump systems and one heat pump Mini split. Replaced the 16 x 20 x 1 filter for a basement system. Inspected 20 x 25 x 5 filter for main level and it is still in good condition. Removed and cleaned washable filters for a mini split. Technician used mild sanitizer to clean surfaces. Added condensate tablets to both pumps for basement systems. Inspected electrical connections, and components of all units. Inspected operations, including refrigerant levels of all units at this time. All three systems are heating properly and operating quite well.