Single duct systems are good for areas that require little differences between spaces. For example, a warehouse setting would be good for CAV since it is essential one giant space that has one HVAC load to meet. These systems can also be found in residential areas. Most housing does not have individual space control; rather a central heating system that determines the supply air based on the entire structures needs. Single space buildings, with little variance are the best application for CAV single duct systems.