Energy friendly control of daylight and temperatures A skylight allows you to enjoy natural daylight optimally. Because of these windows, it can get hot indoors on warm days. An efficient way to prevent this is to stop the sun’s rays before they reach the glass. Topfix VMS will counteract overheating without using lots of energy. This avoids the need of active cooling which is very energy consuming. With Topfix VMS roller blinds you can continue to enjoy the sun's warmth the time of year when it is most convenient and desired. This type of external solar shading not only provides thermal comfort, but also visual comfort: there are no more annoying reflections or discoloration of furniture and interior decoration due to the sun’s rays.