DDC controls allow you to achieve occupant comfort or process condition control in an energy efficient manner. Energy efficiency comes from the ability of the control system to turn devices off when not required or reset or accurately maintain the conditions of the delivered medium whether its air or a fluid. Depending on the medium, the conditions to be maintained are typically temperature, pressure and humidity.

The above is true for standalone or networked controllers. The larger the number of air handlers, fans, rooftops chillers, etc. on a site, the more sense it makes to have the controllers networked. This, along with a computer based human interface allows easy modification of the time of day schedules and night setback set points over the network.

When you have a networked system, demand limit control is possible. It monitors the incoming power and starts turning off non critical devices to stay below the power demand charge limit.