Energy Efficient HVAC Systems Will Surpass $33 Billion in Annual Revenue by 2020, Forecasts Navigant Research

Energy consumption by heating, ventilation, and air conditioning systems accounts for roughly 40 percent of total building energy consumption, and in turn, buildings account for 35 percent to 40 percent of total worldwide energy consumption.

Source: http://finance.yahoo.com/news/energy-efficient-hvac-systems-surpass-151500019.html

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