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Radiant/Hydronics / Latest News / HVAC

April 4, 2008 ― Studies Confirm Energy Savings Significant in LEED, ENERGY STAR Buildings

April 4, 2008
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Two recently released studies, one by the New Buildings Institute and one by CoStar Group, have validated what the green building community has known all along: third-party-certified buildings outperform their conventional counterparts across a wide variety of metrics.

Two recently released studies, one by the New Buildings Institute (NBI) and one by CoStar Group, have validated what the green building community has known all along: third-party-certified buildings outperform their conventional counterparts across a wide variety of metrics, including energy savings, occupancy rates, sale price and rental rates.

In the NBI study, the results indicate that new buildings certified under the U.S. Green Building Council’s (USGBC) Leadership in Energy and Environmental Design (LEED) certification system are, on average, performing 25-30 percent better than non-LEED certified buildings in terms of energy use. The study also demonstrates that there is a correlation between increasing levels of LEED certification and increased energy savings. Gold and Platinum LEED certified buildings have average energy savings approaching 50 percent.

“The NBI Study confirms that newly constructed LEED certified buildings use significantly less energy than their conventional counterparts, and that they perform better overall,” said Brendan Owens, vice president, LEED Technical Development, U.S. Green Building Council.

“The report also underscores that monitoring a building’s ongoing operations and maintenance, as required in LEED for Existing Buildings: Operations & Maintenance and ENERGY STAR, is equally important,” continued Owens. “Buildings are complicated systems and achieving and maintaining high performance is a process that requires the ongoing discipline and commitment to green practices. LEED and ENERGY STAR provide building owners and operators with valuable structure to maintain high performance and deliver savings over time.”

Energy savings under EPA's ENERGY STAR program are equally impressive: buildings that have earned the ENERGY STAR label use an average of almost 40 percent less energy than average buildings, and emit 35 percent less carbon.

But beyond the obvious implications of reduced energy use and reduced carbon emissions, the results from both studies strengthen the "business case" for green buildings as financially sound investments.

According to the CoStar study, LEED buildings command rent premiums of $11.24 per square foot over their non-LEED peers and have 3.8 percent higher occupancy. Rental rates in ENERGY STAR buildings represent a $2.38 per square foot premium over comparable non- ENERGY STAR buildings and have 3.6 percent higher occupancy.

And, in a trend that could signal greater attention from institutional investors, ENERGY STAR buildings are selling for an average of $61 per square foot more than their peers, while LEED buildings command a remarkable $171 more per square foot.

The group analyzed more than 1,300 LEED Certified and ENERGY STAR buildings representing about 351 million square feet in CoStar’s commercial property database of roughly 44 billion square feet, and assessed those buildings against non-green properties with similar size, location, class, tenancy and year-built characteristics to generate the results.

“ENERGY STAR is a prerequisite in LEED for Existing Buildings, signaling our strong commitment to the energy savings component of green buildings,” said Owens. “Add to that the additional performance enhancements in LEED around intelligent site selection, water conversation, improved indoor air quality, waste reduction and smarter materials selections, and it’s easy to understand why owners and tenants are placing a premium on green buildings.”

The NBI study was funded by USGBC with support from the U.S. Environmental Protection Agency and can be accessed Here.

For more information on the CoStar study, click here >>  

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