Select the perfect shingle
For the steep-sloped roofs found on most U.S. homes, standard fiberglass asphalt shingles can be replaced with cool asphalt shingles containing specially coated reflective granules to help them better reflect sunlight. Shingles made from wood, polymer, and metal can also be coated to improve their solar reflectance [source: Department of Energy].
Shingles are generally not as reflective as any of the cool roof options available for low-sloping roofs, but their familiar appearance and traditional style make them a popular choice for residential construction. A cool shingle with white granules costs about the same as one with the old, standard dark asphalt granules, while a shingle with its specially coated granules colored to match the desired color of the roof can cost from about 35 to75 cents more per square foot [source: Department of Energy].