My contractor spends all day repairing the holes in the existing ducts…
… and adding new branches off the main heating duct.
He also moves a cold air return that was improperly cut into the main return, and properly runs it through the wall and down to the floor.
Rebuilding the HVAC has an immediate effect on the air pressure. The basement level has a much more even distribution of heat and airflow, and the main level heat and airflow is elevated to proper levels ($124.10).