Arrived to do performance maintenance. Inspected the condensation drain line for flow. Inspected system air filter and replaced it. Verified operation of all mechanical and electronic components in the furnace. Checked blower for cleanliness and to see if there is any play in the bearings. Checked system heat exchanger to ensure proper venting of flue gas. Checked air conditioning coil for cleanliness and to see if there are any restrictions to airflow. Found that the drip pan is coated in bacterial growth. Analyzed the combustion gas to ensure safe and efficient flame. Performed an electronic gas leak search. Cleaned the exterior of the furnace and water heater. See estimates for pricing on all recommended repairs to keep the furnace from promoting bacterial growth. Furnace and humidifier are operating properly at this time.