Many times, customers concerned with only heat gain and/or glare problems will leave off the north exposure windows. However, if you are a customer concerned with fading, remember that indirect UV is still making it through north-facing windows even if direct sunlight isn’t. Check out this leather chair that was left by an un-filmed north-facing window for several years:
All materials & dyes have different sensitivities to fading, but a good rule of thumb is that 40% of fading is caused by UV, 25% is caused by heat, & another 25% is caused by visible light (the remaining 10% is caused by other factors – stuff window film can’t help you out with – like how much you walk on the carpet, how you clean your furnishings, etc…). With that in mind, filming the windows in your home can significantly reduce the fade rate of your furnishings by reducing the UV, visible light, and solar heat entering your home. Most films block 99% of UV (the residential film we offer blocks 99.9%) and varying degrees of visible light & solar heat depending on the product you choose. Our most popular residential films are estimated to reduce the fade rate of furnishings by 60-65%.