The highly reflective shingles can help to reduce temperatures in your attic, so your home will stay cooler in the summer—to save on air conditioning costs. Cool Series shingles use specially-designed roofing granules that have greater reflectance than traditional shingles. The result is, it minimizes the transfer of heat to the space below to keep homes cooler in the summer. The shingles are made with the patented StainGuard algae protection to assure the beauty of your roof against unsightly blue-green algae.