return air ducts
We have a two story house but the upstairs is not warm in winter or cool in summer. We have been told we have a good heater and AC. This is the first house that does not have return air duct work. It is just a vent on the wall, it is not cut through to the first floor or basement. The upstairs vent does not even get dirt on the vent. I think the dirt is just building up between the studs? Would it be better to install sheet metal for the return air? I find it very difficult to go upstairs in summer because of the humidity. Would installing return air duct work help?