With energy rates increasing at an alarming rate across the country, homeowners are demanding that the products they put in their homes be energy efficient. VELUX is answering those demands. Unlike any other skylight manufacturer, all of our skylights have received 4.5 or 5 stars on the WERS for skylights Energy Rating Scheme. Maximum is 5 stars. WERS is a scientifically energy rating scheme developed to aid the design of energy efficient housing. This means that VELUX products promote energy efficiency, saving you money on utility bills - all while enhancing the look of your living space.