Preformed 2 unit system check on 13 year old Lennox furnaces. During inspection found both blowers with some build up. Both blower amps are good. Cleaned flame sensors. Changed 16x25x1 filters. Cleared inducer draft ports. Upstairs capacitor is out of testing range. Both systems have apco x as well as wet switches. Ensured flood protection is operational. Both systems heating at this time. Quoted blower cleanings and capacitor change.