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Hi, just closing on a 2002 manufactured home in Ohio(gets cold here) It presently has a Coleman furnace, no central air. want to replace or update system. has no return air system except thru furnace top and louvered door. 1512 square ft. no plenum on top of furnace(is this usual)Would like to add central air and possibly up to more efficacy furnace. no gas available at location.Used to be hvac man about 30 yrs ago, boy have things changed any help would be greatly appreciated.