When performing a room-by-room calculation in Cool Calc only enter the wall lengths of the outside walls and partition walls in the above grade wall section. Interior walls can be omitted.
A partition wall is a wall separating a conditioned space from a non-conditioned space such as a garage or non-finished portion of a basement.
Although interior rooms will have no wall load the interior rooms should still be included in a room-by-room calculation so the system can determine the overall volume and floor area of the home. This information is required for the infiltration and duct load calculations.