VAV systems

When using a central air treatment system in a building there is sometimes call for adjustment per room or zone. This can be because the thermal load in the different rooms, due to orientation or internal load, differ so much that undesired temperature differences will arise. It can also be because the user wants to have the freedom to choose the temperature of the room. While one person feels comfortable in a somewhat higher temperature, the other wants a lower temperature to be able to function optimally. Adjustment can be done in various ways.