I am very much aware of the simple laws of physics in relavance to heat rising. And as I stated in my original post, the insulation looks fine. I am not sure as to what you are refering to when you say supplemental heating/cooling and I do not desire to live in a basement. If new ducts would alleviate this problem, I would appreciate a little information on that subject if you have it. Also, I should add that the temperature between the floors is quite extreme during both times of the year according to the current home owner.