What does 'DUAL' mean in cars?

[DeCooper]

"DUAL" in cars refers to the air conditioning zone control button. Here is some relevant information: 1. Air conditioning zoning: Air conditioning zoning is the reasonable division of the entire air conditioning area into several temperature control zones based on load analysis and 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 the indoor thermal environment, and reduce air conditioning energy consumption. 2. Ventilation system: Its function is to ensure indoor ventilation while the car is moving, meaning that fresh air is continuously introduced into the car interior to expel dust, carbon dioxide, and harmful gases from the engine.