When the Apollo serviceman checked on our furnace, that wasn't working, and replaced a small part to get it working again, I asked for information about replacing the heat ducts. They had some holes in them, plus they were a tangled mess, apparently from installing new ducts at different times, and the insulation blanket was torn and falling off. Apollo designed a new more efficient duct system, installed two new vents to downstairs rooms that hadn't had heat vents, installed modern, efficient insulation, and modern controls to regulate the heat to each heat vent. They also coordinated with the asbestos removal company so that the asbestos and old ducts were removed one day and the new system put in place the next day. The Apollo workmen were neat, and left the garage clean.