I am currently running a large EPA stand alone wood stove in my unfinished basement. My ranch house is about 1900 sq ft in the basement and another 1900 sq ft of living space. It seems to get the heat I really want upstairs I would need to fully and properly insulate my basement. Looks to be a daunting and expensive task. I am wondering if putting an add on furnace in it's place would make sense for me. In theory I would not be heating the basement, instead ducting most of the heat to the upper floor. I am specifically looking at the Englander 28-3500, non-EPA with an 800 cfm blower, I cannot afford a more efficient furnace right now. Below is a drawing of my current setup. The add on furnace would be placed where the wood stove is now. The furnace would sit under the far end of my main trunk line from my forced air oil burner. I know the add on furnace cannot be piped into the return of my oil furnace. I also do not see how I could use the oil furnace to help move the hot air, since the furnaces would be across the house from each other. So, could I in theory just duct from the add on furnace right into the main trunk and hope the built in blower can push air to all of my supply ducting? Or, would I be better off installing a stand alone smaller trunk line and just ducting to certain rooms? red are supplies and blue returns.