Performed 2 system maintenance. Upstairs is a heat pump system. Checked 16x20x5 media filter and is still in good condition. Checked components and operation and system working properly. Main floor has a natural gas furnace. Checked 16x25x5 media filter and is still in good condition. Checked components, blower motor, burners and heat exchanger. Furnace is working properly. Will need to replace filters next visit.