What does the AC button in the car mean?

[OMarcus]

The AC button in the car is the abbreviation of the air conditioning device. Pressing the AC button will start the air conditioning to adjust the temperature according to the set temperature, while turning it off will only activate the air blower part, adjusting the mechanism. When the AC button in the car is turned on, the compressor inside the car will start working. The AC button in the car also has a small function, which is to defog the windows. When the air humidity is relatively high, entering the car will make you feel very damp. At this time, pressing the button and blowing air for a while will remove a lot of the moisture, thereby achieving the function of defogging the windows. In AC mode, since the car's air conditioning compressor is always in working condition, it will inevitably lead to an increase in fuel consumption and engine load. When using the heater, the AC switch should be turned off to prevent the compressor from running while using the heater, causing additional fuel consumption during heating.