Commercial and industrial HVAC systems represent a large portion of U.S. energy consumption. According to the U.S. Environmental Protection Agency (EPA), buildings are responsible for 39 percent of total U.S. energy use and 68 percent of total U.S. electricity consumption. The EPA has predicted that energy and electricity demand in the United States will increase by 31 percent and 40 percent, respectively, within the next 25 years. The current economic situation and a worldwide desire to be ...

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