Dave S. #1618 came to my home to service my furnace today. He arrived at the expected time, was very respectful of my home, put on his boot covers, and walked me through the workings of my furnace. He systematically ruled out the possible causes of the problem, and then removed the offending substance, cleaning up as he proceeded. He also checked other components that he thought may need to be addressed and found a problem with the humidifier, which he promptly corrected. He was very knowledgeable, efficient, personable, and humorous. Thank you, Dave!