Upon arrival I found the furnace wasn't staying lit, had loose wires on the control board, loose wires on limit switches. Blower wheel Is dirty and out of balance. Explained to Cust they have a lot of biological growth through our the system and duct work. Need to clean system to help prevent minor issues happening over and over. Recommended level 2 duct cleaning to clean system and duct work Fixed minor electrical issue system is operating at this time home was 68 heated up to 74 no issues at this time Need to follow up with Cust for monthly investment option on duct cleaning a week from today