For this job I worked on a heating tune-up on this gas furnace system. I went through all the mechanical and electrical parts of the heating side of the system and checked for maximum efficiency. Filter was replaced and system had a perfect delta. Duct cleaning 2 is recommended for system, dust levels are high. Duct cleaning 2 includes duct clean, blower clean, coil clean and microbial mist for ducts. Thank you for choosing Comfort Experts, have a great day!