Timberline® Cool Series® Roofing Shingles highly reflective shingles can help to reduce temperatures in your attic, so your home will stay cooler in the summer - to help save on air-conditioning costs. According to the Cool Roof Rating Council, cool roofs may save homeowners an average of 7-15% on their total cooling costs. A cool roof minimizes the solar heat gain of a building by reflecting incoming sun rays and re-emitting the absorbed energy.