We just bought a large home built in 1856, downstairs it is completely updated, upstairs its like the dark ages. We've ripped everything out down to the stud walls and have just finished the electical. I need tips and or resources on running the heating/cooling ductwork and connecting it to the existing furnace (it is big enough for the whole house)located in the basement. I have limited knowledge on this but am a determined do-it-yourselfer. Any help will be appreciated.