YPE html PUBLIC “-//W3C//DTD XHTML 1.0 Transitional//EN” “http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd”> Coating exterior walls with solar-reflective paints can lead to substantial energy savings in hot climates while curbing pollution, a Berkeley Lab study concludes. (Credit: iStock/YayaErnst) If these walls could talk, they might tell you that cutting energy costs and pollution may be as easy as giving them a fresh coat of lighter, more reflective paint. A study by scientists at the U.S. Department of Energy’s Lawrence Berkeley National Laboratory (Berkeley Lab) modeled several different types and ages of homes, retail stores, and office buildings in cities across California and the U.S., and found that in many places sunlight-reflecting “cool” exterior walls can save as much or more energy than sunlight-reflecting cool roofs. Cool-wall benefits, technologies, and implementation are summarized in a recent Berkeley Lab-led report prepared for the California Energy Commission: Solar-Reflective “Cool” Walls: Benefits, Technologies, and Implementation. Two other recent studies published by researchers at Berkeley Lab and the Univers...