 Well, with the caveat that, like I said, I don't put the air on until it gets to be about 110 outside. I understand, but no matter what comfort level you like to use that air conditioning, you're going to be using less of it if you have low-e glass. And any idea of approximate cost and the difference? You know, I wouldn't consider for a second not using low-e glass in a house, no matter where it was in the country that I was building or putting windows in.