California is a mixed climate region that requires both heating and cooling. To determine the proper energy efficient replacement windows for your California’s home, the state is separated into two zones; Northern/Central and Southern/Central. Efficient Windows Collaborative (EWC), a coalition of private and public organizations and agencies that seek to expand the market for high-efficiency

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As energy use across the country rises due to rapid increases in electronic devices and appliances in homes, California’s per capita energy use has been almost flat for the last 35 years. This trend has been described as the Rosenfeld Effect, named after former Commissioner of the California Energy Commission Dr. Arthur H Rosenfeld. Rosenfeld

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