What is the appropriate temperature for car air conditioning?

[AddysonRose]

The suitable temperature for car air conditioning is: in summer, it can be set between 21 to 25 degrees Celsius, and in winter, between 25 to 28 degrees Celsius. The temperature inside the car should not differ too much from the outside environment, as this may cause discomfort to passengers. Generally, the temperature difference between the inside and outside of a car should be around 10 degrees Celsius, while for large buses, it should be between 8 to 12 degrees Celsius. To avoid air conditioning sickness, if the air conditioning needs to be used for a long time, the windows should be opened slightly at regular intervals to ensure fresh air inside the car. Additionally, car owners should try to avoid using the air conditioning for extended periods, generally not exceeding one hour.

[StCassidy]

I once heard a senior mechanic talk about this topic, and the most recommended setting is around 25 degrees. This temperature doesn't put too much load on the engine, won't significantly increase fuel consumption, and won't make you shiver when getting out of the car because it's too cold. When driving on the highway, I usually lower it to 23 degrees with the fan speed on the second level, which helps prevent the windshield from fogging up. Remember not to point the vents directly at your face, as it can easily cause headaches. If there are elderly or children in the car, raising it to 26 degrees is more comfortable, and it's best to direct the vents toward the feet. Also, remember to switch to the external circulation mode for ventilation when using the AC for a long time, otherwise, the air inside the car can get stuffy and cause dizziness.

[SamuelAnn]

For my morning commute, I prefer setting the AC to 24°C with two bars of fan speed – just perfect. When the midday sun gets intense, I lower it to 22°C to combat the heat. Temperature control requires real finesse: too low risks catching a cold and spikes fuel consumption; above 26°C feels stuffy. Once I transported a client at 25°C, and they complimented the cabin comfort. With elderly passengers, I turn the dial up one notch. For pregnant passengers who run hot, lower the temperature but avoid direct airflow to the abdomen. With kids in the backseat, adjust vent direction – direct cold airflow may cause chills. Interestingly, thermometer readings often differ 2-3°C from perceived comfort levels.

[McLayla]

It's recommended to set the temperature between 22-24°C in summer. This range cools quickly without wasting fuel. For long trips, I blast the AC for 5 minutes first before reducing fan speed, maintaining 23°C to best prevent drowsiness. Set it to 26°C when carrying elderly passengers for added safety. Important note: Large temperature differences increase heatstroke risk when exiting the vehicle! When parking lot thermometers show 40°C, setting 20°C inside is downright dangerous. Don't copy youngsters who set 18°C while wearing jackets - it strains the AC and invites colds. I keep a light jacket in my car, putting it on when the AC stabilizes at 24°C - much simpler than adjusting temperatures.

[VonCollin]

Actual tests show that passengers complain the least at 25°C inside the car. My four-year experience as a DiDi driver: for young passengers who actively request lower temperatures, set it to 23°C but avoid direct airflow; for middle-aged passengers, default to 24°C with medium fan speed; when transporting children, automatically raise it to 25°C. Once a passenger said they were cold, increasing the temperature by one degree immediately made them comfortable. The key is to control the temperature difference: when it's 35°C outside, don’t set it to 20°C, 24°C is enough—it’s cool but won’t make you dizzy from the heat when getting out of the car. If there’s a big temperature difference between the front and rear seats, slightly close the rear air vents.