We want to heat the main floor of this two story house with forced air. The floor plan is attached.
I can get a cold air return in the master suite area, by slotting baseboards under one of the built-in closets in the dressing area, but is another cold air return necessary in the large, open, door-less area of the rest?
The stairway going down to the basement, has no door at its bottom. Does the stairway function as a cold air return?