We are the mechanical on a 148 unit senior housing project. Each unit will have a magic-pak gas /electric thru the wall unit. I gave the G.C. a C.O. a 108K proposal to install natural gas sub-meters for each unit. The local utility will only meter the complete building. The owner / operator would like to bill each tenant. The 108K is too big (not my margin). Does anyone have an idea on remote runtime heat use? Each unit is to have a stand alone t-stat. All 148 units are the same btu/hr.