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White roof and skylights on Romeoville, Ill. Walmart | by Walmart Corporate
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White roof and skylights on Romeoville, Ill. Walmart

Walmart’s white roofs help reduce energy use and have a lower heat island effect than a darker roofing color. The skylights are part of the company’s daylight harvesting system, which can save an average of 800,000 kwh of energy annually.

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Taken on January 13, 2008