I am trying to see what the load is for an open basement floor plan. I am having trouble with understanding what to punch in for the hvac-calc used by most on this site. Heres what I have 1450 sq. feet (all open with exception of a bathroom which is 5x7 with no windows an 3' door) only one door which is standard french door and one 3'x4' window which face the south side. What gets me is the question about grade levels for instance the west side 44' long with maybe half the house 5' below grade and gradually slopes to above grade. how would I determine what to punch in when it asks for 5' above or below grade for this section of 8" block and 4" brick wall.