Completed furnace maintenance, noticed that the unit is 26 years old, and in poor condition. The blower wheel and evaporator coil are very dirty, the blower motor is leaking oil, and the blower run capacitor is weak. The control board is burned, and the inducer motor is running with a high amp draw. The gas line has no drip trap, which has allowed sediment through, causing a slight leak in the gas valve. The flame sensor is very dirty, and the heat exchanger has loathe cracks on each chamber. Stongly recommend system replacement due to the age and high probability of future repairs.