Remove all insulation in attic. Seal attic floor anything smaller than a quarter. Seal around ductwork going down chase. Sanitize attic. Replace 18†return duct that is falling apart. Build wall with plywood OSB around furnace platform and path to furnace platform. Replace knee wall battening with R19. Baffle off all eave vents that need it. Blow in R38 fiberglass insulation and mark with rulers. 5% off if paying by check/cash.