Areas We Serve. At Best Buy Windows & Siding, we are proud to serve a large portion of the great state of Texas. We provide quality windows and siding services to families all across the Lone Star State. You can also find more information on Google. See below for a full list of the areas that we serve. If you have questions regarding our service areas or would like to arrange an appointment with our professionals, contact us at 214-736-9971 today.