paneling basement and need to install runs off furnace trunks in basement. ranch house, upstairs = 1300 sq feet presently being heated. the existing trunk is an 8 by 12. question i have - is this 8 by 12 trunk sufficient enough to allow me an additional 4 - 6" take off runs for basement? (without messing up heat supply to main floor)? also, i plan to use ceiling heat for basement, with large return cut into cold air return duct at bottom, near furnace. will damper this return so as not to steal too much return from upstairs.
also, i plan to get a new 95? high efficiency furnace in near future.
hope these series of questions are too fragmented. any help would be appreciated.