OK, I have read the owner's manual on this 3 or 4 times and I still don't get it? What are the two buttons between the center vents, one is red and the other blue. The manual said push the blue button on during heating mode (you want cooled air in heating mode?). Then it states push the red button on during cooling mode (fresh air seems to be red?). What is the purpose of these buttons? Today, I pushed the red button on during cooling mode and it seemed to do nothing other than cut my air flow down? Any light you guys can shed would be great!