My home has a 4-ton package heat pump, at one end of the long house. The return duct is 24" diameter sheet metal, and runs over half the length of the house, in the crawl space. It is fed by two grilles in the wall, each using a 20x25 filter. These grilles are in the same hallway, only about 10' apart.
I am reworking a bedroom, and I would like to remove one return to gain space in the closet. The return which is farther from the unit does not seem to move much air, so I suspect that two are not needed. Is this worth pursuing?