Do you need to turn on AC when using car air conditioning?

[DelColin]

In winter, there is no need to turn on the AC when using the car air conditioning, but in summer, the AC should be turned on when using the car air conditioning. The AC button is the cooling switch of the car air conditioning. If the AC button is not pressed, the car air conditioning will not cool. Car air conditioning refers to the air conditioning device installed in the car, which can cool, heat, ventilate, and purify the air in the compartment, providing a comfortable riding environment for passengers, reducing the driver's fatigue, and improving driving safety. The cooling principle of the air conditioning is: 1. After pressing the AC button, the clutch of the air conditioning compressor can engage, and the engine will drive the compressor to run. When the compressor is running, it can continuously compress the refrigerant and deliver it to the evaporator. The refrigerant expands and absorbs heat in the evaporator. 2. The refrigerant can cool the evaporator, and the cooled evaporator can cool the air blown by the blower, so that the air conditioning vents can blow cold air. In winter, there is no need to turn on the AC because the car's heating is achieved by the heat generated by the car's own engine to produce warm air. The following introduces the normal method of turning on the heating in the car: 1. In winter, when the engine has just started, the temperature of the water tank is still very low. Turning on the air conditioning will not quickly increase the temperature inside the car but will increase the burden on the engine and delay the normal increase of the engine temperature. 2. After the car starts, it takes about 8-15 minutes for the water temperature to rise to the normal temperature. Generally, when the water temperature rises to about 70°C, the heating can be turned on. 3. Turning on the car heating does not require turning on the AC switch because it will start the compressor, which means turning on the cooling.

[MacKevin]

I've been driving for over 20 years, and whether to turn on the AC in the car depends on the weather and needs. In summer, when using the air conditioning for cooling, the AC must be turned on. The compressor and fan work together to quickly lower the temperature, making the car less stuffy. Without the AC, just using ventilation is like blowing hot air and has no effect. However, in spring and autumn when the temperature is moderate, just turning on the fan for ventilation is enough. Turning on the AC increases the engine load, costing about 10% more in fuel, which isn't worth it. The AC also has the benefit of dehumidifying and defogging. For example, on rainy days when the windows fog up, turning it on can clear up the view for safe driving. Developing the habit of using the AC wisely, such as turning it off before shutting down the engine, can protect the system's lifespan. Regular maintenance is also crucial; otherwise, the cooling effect may be poor, or strange odors may appear.

[VonSawyer]

Whether to turn on the AC when using the air conditioning depends on the effect you want. Turning on the AC activates the cooling system, where the compressor and refrigerant work together to cool the air. If you only need ventilation without cooling, turning off the AC and using just the fan saves money and fuel. In the scorching summer, don’t hesitate to turn on the AC to quickly lower the cabin temperature for comfort, but avoid keeping it at the lowest temperature setting to prevent increased energy consumption, which may raise fuel usage by 5-8%. In winter or cool weather, using the fan for ventilation is sufficient. The AC button on the control panel is usually marked with a snowflake symbol, and some cars with automatic climate control will intelligently manage it when you press AUTO. Proper use of the air conditioning system can reduce cabin odors and simplify maintenance—opening the external circulation mode more often improves airflow.

[MacSophie]

Turning on the AC in the car is essential for real cooling; otherwise, it's just the fan blowing air with little temperature change. Activating the AC starts the entire refrigeration system, especially during summer heatwaves, instantly lowering the temperature to protect the health and comfort of family members, especially the elderly. When only ventilation is needed, you can turn it off to save some fuel, but this won't help with cooling. Remember, when using the AC, don't rely on it too much—adjust the temperature a bit higher to reduce energy consumption and use the recirculation mode wisely for more even cooling. Develop the habit of regularly checking the air filter to ensure efficient cooling and a more worry-free drive.

[VanOlivia]

As a driver, I find turning on the AC essential when using the car's air conditioning. It activates the cooling core to blow cold air instead of hot air into the car. In the scorching summer heat, not using the AC makes the car unbearably stuffy, like a sauna, so it's necessary to turn it on promptly for quick cooling. In other seasons, if you only want air circulation, you can turn off the AC and just use the fan function, which saves money, is more environmentally friendly by reducing carbon emissions, and protects the car. Turning on the AC increases fuel consumption by about 10%, so don't use it mindlessly. Try experimenting a few times to summarize experiences, such as turning off the AC a few minutes before parking to let the system cool down gradually, extending the compressor's lifespan.

[AlexAnn]

I believe adjusting the AC in the car should be done flexibly based on actual conditions. Turning on the AC activates the cooling and dehumidifying functions, which are essential during hot summer days or humid weather to maintain a comfortable cabin environment and prevent heatstroke risks, though it increases fuel consumption by approximately 5-10%. In mild weather, simply using the fan for ventilation is sufficient, avoiding unnecessary energy waste. The AC also helps defog windows, enhancing driving safety by improving visibility. Develop the habit of setting a moderate temperature, using recirculation mode more often to improve efficiency, and turning off the engine promptly when parked to save fuel and be environmentally friendly.