As the title states Im adding a bedroom in my basement. I am trying to figure out how to properly move the existing overhead heat duct and add a cold air return to the bedroom. I could eaisly shorten the run for the heat duct and drop it into the nearest interior wall for the heat duct to be near the floor, but Im not sure if that is the way to go. The other half of the problem is that there isnt a clear floor joist that enters the area for the new room from the cold air line. What can I do for this? All of the heat runs are a tubular type system as well as many of the cold air runs. Is there a system that I could split one of the joists to run two lines, one heat and one return? Thanks guys.