DCM1 service 2 of 2 Heat: Changed (1) 16x25x1 filter, Performed Heating Maintenance Per Checklist, homeowner mentioned that he had colder rooms with low air flow, found that the supply side of the duct work is in very poor condition, falling apart, laying on the ground , and not connected properly or sealed, appears to be oversized for the equipment that is installed at this time, recommend having a Comfort Advisor Come out and look at ducting and give Options.