All HeatSaver Thermal Shades are custom manufactured for each client's specific needs and requirements. Window sizes and installation options vary widely. We have the experience necessary to find the solution, whether by adjusting onsite conditions through prefabricated materials or adjusting the shade characteristics prior to manufacture. Durability is key to your return on investment. Many of our shades have been in place and operating well for over 20 years. Let us know how we can help you!