1941 Colonial two story home (1600 sq ft.) in Richmond, VA. Ruud Central AC with 1-speed blower.
During summer, the top floor of the house constantly runs uncomfortably 5-6 degrees warmer than the ground floor.
Looking at my ductwork, it's pretty clear why: There is a damper which controls the upstairs vs. downstairs air flow, however the damper is located AFTER four small ducts have already branched off to registers on the ground floor. So even when I move the damper to direct air flow 100% upstairs, the A/C is pouring out those four registers to the ground floor. Meanwhile the air flow at the upstairs registers is anemic.
Would love to get some pro advice on the best way to approach this? Ask a pro to move the damper? Install tiny dampers on the four branches? Put inline duct fans upstairs? Other? Thank you!