I have a Carrier Weathermaker 9300TS 58MTA (93% eff.) 60,000 btu input furnace. The house is in MN and is 2,000 sq. ft.
I recently bought this house. For some reason, the previous owner did not put any vents in the downstairs family room (there is a baseboard electric heater in there instead...wow, is that expensive to run). I am wondering if this furnace is just too small to handle that space or not, because I want to add vents down there.
I realize there are many factors in sizing a furnace, but on the face of it this furnace seems much too small for this house in this climate. The house was built in the 70s and is not tight.
So, I'm trying to figure out if it is worth trying to add vents/improve insulation with this furnace or if I really just need a larger furnace. Any advice?