Energy-Efficient Roofing Options for Wyoming Homes Wyoming’s climate swings from hot, sunny summers to bitterly cold, snowy winters. Choosing an energy-efficient roof  can help Casper-area homeowners save on utility bills and stay comfortable year-round. In this post, we’ll explore the best cool roof  choices for Casper, WY  and beyond – from high- SRI roofing  materials that reflect summer sun to designs that handle heavy snow. We’ll explain the Solar Reflectance Index (SRI)