What Makes a Building Green? You Sure Can’t Tell From It’s Energy Star Rating


Wikipedia/CC BY 2.0

Big buildings use a lot of energy. In New York City they wanted to know exactly how much, and since 2010 buildings have been required by law to provide this information. Now they have put it all into a big spreadsheet and some of the numbers are really surprising. For example, a LEED gold certified building like 7 World Trade Center gets an Energy Star rating of 74, below the minimum of 75 that the EPA sets for a building to be called high-efficiency.

Architect/ Author Witold Rybcznski provocatively titles his post discussing this LEED Lies, writing ” I always suspected that this was more about announcing “I am a green building” than about actually conserving energy.” Witold also wonders about all that glass.

Why are so many LEED-certified buildings all-glass? It seemed to defy logic. After all, no matter how much you can reduce artificial lighting by using daylight, the insulation value of glass is negligible compared to solid insulated walls, and anyway there are many overcast days and dark winter afternoons.

While I agree with Witold about the glass, and have said so before, I take issue with the LEED bashing. I am not a LEED fanboy, but do like the fact that it measures more than just energy use. I don’t think Witold would be happy in a building with no windows at all and minimal fresh air, but I bet it could get a terrific Energy Star rating.

It is great to see that restored older buildings like the Empire State Building and the Chrysler Building prove to be so energy efficient, at 80 and 84 respectively, and shocking to see that the Seagram building does so badly at just 3. The Times notes:

The biggest drain could be the International-style landmark’s most lauded features. The Seagram’s single-pane glass curtain walls, far less efficient than treated or double-pane windows, and its luminous fluorescent ceilings work against energy conservation.

They have some work to do.

Source Article from http://www.treehugger.com/green-architecture/what-makes-building-green-you-sure-cant-tell-its-energy-star-rating.html

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