My daughter bought a single level ranch house with full basement, in New England. The furnace and all ductwork is all in the basement. Furnace was replaced and an a coil added some years ago. The ductwork is the original from when the house was built in the 1950s. The return air registers are placed in the outside walls down at the floor level and the supply registers are located in the interior walls, also at floor level. The house is being pretty much gutted and being renovated. My question: is this setup OK or should the returns draw from the interior walls with the supplies discharging at the outside walls? It seems to me to be backwards and should I consider trying to redo the supply and returns so that the supplies are along the outer perimeter and the returns at the inside walls.