I recently purchased a brick cape cod home in milwaukee,wi. The attic has finished hardwood floors, but unfinished walls (just insulation). I would like to vault out the attic space to create another room. I need to know what is the most economic way to get HVAC to this attic space. I do have a chimney stack chase that i can utilize and I do have central air/forced air heating. I have heard of zoning areas of the home, but have been told my someone in the HVAC business that I would have to run new duct work through out the home in order to zone properly. Is their any truth to this? Any info would be helpful.