Was here for a furnace cleaning. Performed preferred customer furnace cleaning. Cleaned the burners and the flame sensor. Checked the heat exchanger. Wiped down the inside of the furnace. Cycled the furnace. Checked the electrical. Performed a furnace combustion test. The furnace is running normally at this time. Also, The customer was interested in possibly getting a humidifier. Presented options. The customer will think about it and call if they are interested.