I have a 2000 Sq ft house in Texas. ( 5 YO) The front two bedrooms are either hot in Summer or cold in winter(face west). I have ONE return in the back corner of the house with a 18 inch hose feeding my 5 ton air handler. When the fan kicks on it will about suck the hat off you head! It was suggested that I need a return in the front to balance it out. So i must build a plenum. (because it doesnt have one, now the hose just goes straight into air handler) Questions are this: What material do i build the plenum out of? Should I down size the return ducts to say 14 or 12 inch since now there will be 2?
thanks in advance