Arrived to remedy a system that is reportedly not heating well. Upon inspection of the system found that the humidifier panel is covered in bacterial growth. Took this outside. Removed the panel and cleaned up the bracket. Returned the bracket to the homeowner and cleaned up the humidifier housing. Indoor air quality should improve significantly over the next month or so. Performed diagnostic on the furnace. Did not find any sign of the system not keeping up or not heating properly. Let the system run for an extended period of time to ensure that it will not overheat. Determined the issue resides in the smart ac sensor. Relocated the sensor to inside a supply duct in the living room. System is functioning properly at this time.