Performed heating maintenance on three systems. Upstairs and main level or gas furnace 14 x 25 x 1. The basement heat pump system is 16 x 20 x 5. This 5 inch filter is still OK perhaps change next visit. Cleared and treated condensate drain lines. Inspected electrical connections and components. Cleaned flame sensors on furnaces. Checked the refrigerant level and defrost cycle of heat pump system. All systems are operating properly at this time.