I have a commercial building with 5 roof mounted 3 ton heating and air units. I will be replacing them shortly. Problem is one unit goes to two different rental spaces, one on the north and one on the south of the building. All the other heating units go to several rental units but at least on the same side of the building. The problem is only one thermostat and impossible to set to keep both sides comfortable. Not sure if controllable dampers would work. I would really like to install a separate heating unit for the south room which is 16x24. Gas heat with air condition, some kind of wall mounted unit would be nice.