Our home is 64 years old, and we've never replaced the original windows. After meeting Paul, a most charming, and obliging salesperson for Quality First Home Improvement, we had double pane windows installed. They've improved the comfort of our home to a great degree, operate easily, keep the heat out, and the screens are very nice... "and barely noticeable!" The installers were very polite, in and out quickly, and didn't leave any mess! "We'd give them all a 10 star rating if we could!!"