Getting close to a decision on equipment and installer to replace my dead 3.5 ton Rheem HP. Leaning heavily toward the 3 ton Greenspeed. Will include some minor reducting to correct the overcooling in the guest bedrooms in the front half of the house closest to the air handler. These ducts currently run directly from the top of the supply plenum to each of two b/r's, the guest bath, and the laundry room (where the air handler sits). Contractor will disconnect these ducts and add a trunk duct to the plenum to a new distribution box where the ducts will be attached (with hand dampers in case further adjustment is needed).
Also need more return. Existing return filter grille is 20x20 in the hallway near the guest b/r's. It's near the floor and feeds through the wall to the cavity under the air handler stand inside the conditioned laundry room. Initial plan was to add another 20x20 filter grille near the floor feeding through the wall to the same cavity, but around the corner, which puts it in the entry foyer. I now see there may be a better place to put this second return filter grille, but I need some thoughts from you pro's, please.
Realize my entry foyer and "front" door is actually on the side of my house. The entry foyer opens directly into the atrium area (which is surrounded by sliding glass doors). From the foyer, turn right into the hallway leading to the front of the house with the guest b/r's and guest bath. The tstat and return are in this "guest wing" hallway. From the foyer, turn left to enter the hallway leading to the back of the house, where the main living area is, along with the master b/r and bath.
Would it be better to put a jumper duct from the cavity under the a/h (run it beside the a/h up through the ceiling), through the attic to a new filter grille in the ceiling in the hallway that leads to the back of the house where the main living area is, along with the master b/r?????? My thinking is that the air supplied to the main living area currently has to move a long, long way to get back to the one return in the hallway at the front of the house. Adding a return around the corner from the existing return wouldn't shorten that distance any.
Do you need a drawing or a picture?