Our home is easier to cool. We made several modifications as we were having light bills in the summer month in the $400-500 range. Now with our Storm Tight Windows ,a new air conditioning unit , insulation, our home is cooler and our bills are significantly lower, now $120-140 range. We can go without turning on the air for several months as the window keep the house cool. We only did the front windows as this is the hottest sun. till with a significant impact on our home comfort.