Year-long Study shows new window retrofit technology cut energy usage by over 50 percent for renovated hi-rise

The RENOVATE by Berkowitz(TM), LLC (RbB) window retrofitting system has enabled 400 Market Street, a 12-story building in Philadelphia, to reduce energy consumption in perimeter offices by over 50 percent, according to results from a year-long energy study.

Built in 1972, the 200,000-square-foot building was retrofitted with the RbB system in late 2011, converting its original single-pane windows into triple-pane insulating glass units (IGUs).As part of a $1.6M U.S. Department of Energy (DOE)-funded study conducted by the NAHB Research Center and Quanta Technologies, Inc., the building was selected as a real-world case study to demonstrate the ability of low-e retrofit glazing systems to improve the energy efficiency of older commercial buildings. The study examined four unoccupied perimeter offices in the building, two facing east and two facing north. One office in each pair was retrofitted with RbB, while the other was left untouched.

According to project manager Thomas Culp, of Birch Point Consulting, LLC, the renovated north-facing office saw a 33 percent reduction in total energy usage and the east-facing office saw a 53 percent reduction. “We are compiling results for the whole building’s performance to compare them with prior years’ usage, but these results for the building’s perimeter offices are compelling in both heating and cooling performance,” he said.

The DOE estimates that inefficient windows account for as much as 25 percent of a typical building’s heating load in cold climates and 50 percent of the cooling load in warm climates. “After we evaluate all the numbers, we expect the RbB system to have made a significant improvement to the entire building’s energy performance,” Culp added.

Culp said he sees great potential for low-e window retrofits, such as the RbB system. “There are countless older buildings with single-pane windows that waste a huge amount of energy,” he explained. “While results will vary from location to location, 400 Market Street in Philadelphia was an ideal testing environment to determine both heating and cooling benefits.”

Carolyn Pfeiffer, property manager for Kaiserman Company, the owners of the building, agreed. “400 Market Street is representative of many older commercial buildings, both larger and smaller, across the country,” she said. “This is just one of our properties that we have updated with the RbB system and we are excited by the results. RbB is suited for all weather conditions as the results from the energy study show, and it’s a cost-effective alternative to other window replacement scenarios.”

Because the RbB system is a pre-assembled IGU that is installed to the existing interior window surface, it also has the advantage of being much faster and less disruptive to install than a traditional rip-out-and-replace project.

“Our tenants were able to stay in their offices, and we were able to save the time and costs associated with temporarily relocating them,” Pfeiffer said. “Tenants also have shared comments about reduced street noise and indoor comfort, and the maintenance staff has noted reduced cycling times on the boilers along with the ability to lower hot water set points.”

For more information on how the RbB system can help aging commercial buildings become more energy efficient, call (800) 257-7827 or visit

About JEB JE Berkowitz, LP is a leading architectural glass fabricator. Founded in 1920, the ISO 9001 certified company serves customers for the domestic and overseas architectural markets. Products include Tempered Glass, Insulating Glass, Spandrel Glass, Silk-Screened Glass, Glass Doors and Entrances, Laminated Glass, and Point Supported Canopy and Wall Systems. The family-owned glass business is located in Pedricktown,, N.J., with over 200,000 square feet of plant space and over 200 employees.

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600450 Year-long Study shows new window retrofit technology cut energy usage by over 50 percent for renovated hi-rise

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