Furnace precision tune up; clean and tune up furnace; clean burners, test ignition components, adjust gas level, test safety circuit, check indoor motors, checked all electrical components, tested indoor air flow, checked heating temperatures, and tested overall furnace operation. Ignition assembly is failing. Blower wheel is in need of a cleaning. Unit is 27 years old. Average life is 10-15 years. Replacement is something that should highly be considered. Humidifier precision tune up and cleaning. Remove current water pad, clean off pad housing and water distributor. Clean out humidifier box. Clear out drain line. Replace with new water pad. Test operation.