Heating tune up performed on American standard propane furnace installed in 2020, all electrical connections are tight with no corrosion. Gas valve, burners and igniter are all working properly. Heat exchanger is acceptable. Customer changes the air filter regularly. Customer has an American standard thermostat with a pre programmed schedule on it technician turned off the schedule by customer request. System has a drain switch that is located in the emergency drain pan. It is recommended to add a drain switch directly in line with the primary drain to discover a drain blockage as soon as possible. Duct work is inefficient and is causing some air flow issues in the home. Suggest a duct redesign.