The most important thing when you replace your windows its to make sure to take the exact measurements and to customize the new window to the exact size. the installation must to be at the same day of the demolition. you never wants to keep your house without window more than couple hours of the installation. Carolyn B. has a leaks true 3 of her windows and we change them to a new Vinyl windows with high insolation of Milgard brand with a great warranty.