Johnson Controls is widely considered the leader in the Building Efficiency segment. They design, produce, install and service heating, ventilation and air conditioning systems, industrial refrigeration, building management systems, fire and security systems and mechanical equipment for commercial and residential buildings. Building Efficiency is the company’s longest-running business unit, dating way back to 1885 when Warren S. Johnson founded the Johnson Electric Service Company after patenting the electric thermostat 2 years earlier.
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