Hearst Corp.'s new 46-story headquarters is a wonder of green building. The structure's grid-like frame required 20% less steel than would be used for a similar conventional perimeter frame. Sensors control lighting, dimming, or turning off interior electric lights when natural light is available. For most of the year, a state-of-the-art HVAC system uses outdoor air for cooling and ventilation. As a result, the energy used and carbon dioxide emissions are slashed to 22% less than an average office building of comparable size in New York.
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