Campbell Spellicy developed a comprehensive district-wide Direct Digital Control (DDC) master plan for the City of Gainesville, aimed at upgrading and integrating the operations and maintenance of HVAC systems in eight of the City's most energy-intensive buildings. The plan included new control specifications and optimized sequences of operation for all equipment, designed to enhance energy efficiency and maximize the City's return on investment. Direct Digital Control (DDC) is a method of controlling building systems such as heating, ventilation, air conditioning (HVAC), lighting, and other environmental parameters through digital means, without the need for intermediate analog devices. It involves the use of microprocessors or microcontrollers to manage and regulate these systems based on input from sensors and user-defined setpoints.