When you think about the ambiance in your home, you may think about factors like interior lighting, color choices for your walls, and fabrics used with the upholstered furnishings. Window treatments are often viewed as an afterthought with ambiance and dÃ©cor, but they can have a major impact on ambiance. In fact, they can influence ambiance in several ways. Before you buy window treatments for your home, think about these points to make a better buying decision.Â Room LightingDifferent types of window treatments allow varying amounts of natural lighting into the space. For example, heavy drapes will block far more light than sheers will block. Just as the interior lighting from lamps and overhead lights can influence ambiance, the same holds true for the natural light that streams into a room from the windows.