JCPenney saved over 47 million kWh and $5 million with variable frequency drive retrofits of rooftop units across 131 stores. The case study describes the decision process and results of this successful program.
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Historic preservation and net zero energy performance may seem like opposing goals. But the modernization of the nearly 100-year-old Aspinall Federal Building and U.S. Courthouse demonstrates that it is possible to restore the former glory of a building's historic features and cut energy use in half. The building is approaching net zero energy and is expected to achieve that goal after controls adjustments and other measures.