My father in law just purchased a metal building on concrete slab. part of the metal building is setup for an office/living quarters. It has average insulation package with sheetrock walls and single pain windows. the previous owner just had a window unit in each room.
I know when i get time and do the manual J on this, it will most likely not call for a 2 ton system and will only call for probably 4-5 supply ducts MAX. (two rooms and one bathroom and one closet) he was wanting to install a normal horizontal unit in the attic space above the living quarters with the ducts dropping down into the ceiling. what would you suggest to use if it tells me less than 2 tons.