Do I need to turn on the AC button for heating?
2 Answers
You do not need to turn on the AC button for heating. Function of car air conditioning: It is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to the optimal state, providing a comfortable riding environment for passengers, reducing travel fatigue, creating good working conditions for the driver, and serving as an important ventilation device for ensuring safe driving. Car air conditioning system: It generally includes a refrigeration device, a heating device, and a ventilation device. This combined system makes full use of the limited space inside the car, has a simple structure, is easy to operate, and is a popular modern car air conditioning system internationally.
When using the heater, you generally don't need to turn on the AC button. From a cost-saving perspective, here's my experience: The engine provides free warm air once it's heated up. However, once the compressor kicks in, fuel consumption increases significantly. I've calculated that fuel usage can spike by 10% to 15%, which is like burning money for nothing. Unless you encounter high humidity causing windshield fogging—turning on the AC for a few minutes quickly removes moisture, then turn it off once the heater is sufficient. For daily driving, keep the AC off when using the heater—it saves fuel and avoids uncomfortably dry air. Over time, this also reduces compressor wear and saves on maintenance costs. Personally, I prefer turning up the temperature dial and mostly ignore the AC button, saving dozens of dollars on fuel each month.
