In April 2009, the Empire State Building began a $20 million energy retrofit in the hopes that energy use will be cut by 38%. It is expected that the energy saving techniques will save the building owners $4.4 million in energy costs every year. Changes to make the building greener include:
-Filling the windows with an energy saving gas and adding an extra windowpane-Upgrading the cooling system in the building-Using energy management technology that can adjust temperatures floor by floor-Shutting off lights in unused areas-Replacing interior lighting with more energy efficient fluorescent bulbs
The spire lights on the exterior of the building have not yet been upgraded, but engineers have said that energy efficient LED lighting is a possibility when the price drops enough.
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