In warm climates, cool or heat-reflective roofs can save 10-30% on cooling costs.
For a new or replacement roof there may be no difference in the price, or a very slight premium, and it may even be cost-effective to turn an existing roof cool. Check out this savings calculator.
Because of the electricity savings potential through roof replacement, utility companies such as Florida Power and Light frequently offer rebates to help offset installation costs.
In a study undertaken by the National Laboratory in Oak Ridge Tennessee, buildings with terracotta tiles painted with reflective paint used 35% less energy over the summer months.
Cool roofs are typically thought to be white or metal, but darker colors can also be cool – the key factors are how much sunlight they reflect and heat they emit.
Metal roofs do have the added advantage of longevity, around 50 years compared to 17 for a shingle version. Plus they are recyclable!
The U.S. Department of Energy embarked upon a Cool Roof initiative in 2010.