I live in a split and our upstairs always seemed hot w/the air on unless we turned it down to like 66 degrees...well now I've learned a new trick, get a tension rod and put it across your stairwell and hang a sheet or shower curtain on and weigh down the bottom (we use door stops on each side) and you'll be surprised at the cool air that stays upstairs instead of floating downstairs. Keeps the upstairs way cooler now.
