Energy retrofits for the Empire State Building will reduce the building's energy use and carbon emissions by up to 38% over the next four years, writes Ray Quartararo, program manager for the retrofit. When the project is completed, the building will have an Energy Star score of 90, which would rank it in the top 10% of energy-efficient buildings in its size category. The project will include adding insulation, improving lighting designs and replacing air-handling units with variable frequency drive fans. Quartararo said the owners of the building hope the project will serve as a model for other energy retrofits.

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