A smaller building may have a single, computerized HVAC controller that operates the direct digital control (DDC) system. However, a large building normally requires a more complex system of ...

(direct digital control) building management system in Georgia's DeKalb County. For 20 years, the DeKalb County school district had utilized a radio-frequency energy-management system using Ergon ...

The advent of electromechanical controls in the 1970s, analog controls in the 1980s, direct digital control (DDC) in the 1990s, and complete building control integration in the 2000s has progressively ...