What does dual mean in a vehicle?

[Gail]

Dual in a car refers to the air conditioning zone control button. By pressing the dual switch, you can independently adjust the air conditioning temperature for either the driver's seat or the front passenger seat. Here is an introduction about dual: 1. Function: The dual switch can meet the different air temperature requirements of passengers in two different positions inside the car, allowing for flexible adjustment and conversion between different temperature differences in independent zones. 2. Definition: Zoned air conditioning refers to the ability to independently adjust the temperature in different areas within a single cabin. For example, dual-zone air conditioning means the temperature on the left and right sides of the car can be adjusted independently; quad-zone air conditioning means the temperature in the front and rear rows, as well as the left and right sides, can be adjusted separately, meaning there are four zones with independently adjustable temperatures. The principle involves adding air conditioning dampers to divide the air ducts into finer and more sections, which are then directed through several mixing dampers to different pipelines. These mixing dampers are controlled by multiple independent controllers, but there is still only one air conditioning compressor. Air conditioning zoning is based on load analysis, dividing the entire air conditioning area into several temperature control zones according to the differences in air conditioning loads. The purpose of air conditioning zoning is to enable the air conditioning system to effectively track load changes, improve indoor thermal environments, and reduce air conditioning energy consumption.