Heat rises, so, when the vents are blowing hot air down from the ceiling... floors stay cold. Lower walk outs with ceiling vents, floors stay freezing. Here at my house, I can put a cup of milk on the ledge that runs along the wall, or even just set it on the coffee table, in my lower level, and it will remain refrigerated... the heat ducts run thru the crawl space in the attic, and even covered with insulation, the floors remain cold. The vents are also on an outside wall in both bedrooms, and they only get warm if I turn on the space heater. The guy who built this house, he was from down south, and thats where they put them... in the ceiling. This is the first house I have ever seen or lived in here that has the heat ducts in the ceiling instead of at floor level.