Early 90s we had a 55' X 28' in Salem, ny also the last fifteen feet was addition, with cobbed 4" circles cut into the floor for heat. Went to a tin knocker in Glens falls, custom made us 4" X 10" straight line duct, with 90s and 45s. Added that to the two end runs, dampered down other house registers evened out temperature across the home. But what I didn't tell you was dealing with the underside of a doublewide or single mobile is completely a royal pain. Cut out all black insulation under house, trying to find dead animal in between floor and insulation that was mistake, anyway. You'll notice mobile home ductwork is junk at best, odd size and flimsy. Tied the two trunks in they work fine, then installed all in one ac unit, made by Heatcontroler, from Sawyers in Glens falls ny. Installed large 12" round duct and 10" straight return round duct. Mobile homes have uninsulated ductwork the ac causes the ductwork to sweat perfusely, which in turn keeps underside of floors damp in summer.
My daughter, husband, and four kids are living there now, but if I could do one thing different, I would have insulation contractor come in the spray the whole underside including ductwork with the blue expandable insulation, also while I had insulation out from the underside exposing ductwork, sealed every nook and cranny with aluminium duct tape, what a difference that made....
This year 2011, we bought parents in laws home in Greenwich, sticking with 25,000 btu window unit instead. New windows, doors, sub floors, electrical service, riping out every peice of Sheetrock, to run complete new wiring. The only thing we don't plan on changing is the roof and structure. Well, if the roof starts, steel roof time.... we don't didn't intend all this, but once we got in here, what a mess, and cigarette smoke all throughout with yellow on walls, yuck.
Last edited by gregieOops; 11-04-2011 at 04:17 AM.
Reason: typos and spelling