At Window Joe Replacement Windows we strive to help homeowners become educated consumers as they shop for and purchase replacement windows for their home. From u-factor to shgc, there is a great deal of practical and technical information that you should know prior to purchasing windows and/or hiring a window replacement installer. With our in-depth content covering every state and every major and minor metropolitan area within the United States, you can rest assured that you will have all the knowledge you need in order to make the best decision when you purchase replacement windows.