What is the Appropriate Temperature to Set the Car Air Conditioning in Winter?

[VonAshlyn]

The in-car temperature is best maintained between 18°C and 25°C, with a recommended temperature difference of no more than 10°C between the inside and outside of the vehicle. Here are some relevant details about car air conditioning: 1. Air Conditioning Components: Automotive air conditioning systems typically consist of a compressor, electronically controlled clutch, condenser, evaporator, expansion valve, receiver-drier, piping, condenser fan, vacuum solenoid valve, idle speed controller, and control system. 2. Working Principle: The electronic control unit will automatically operate the air conditioning system based on the settings made by the driver or passengers via the buttons on the air conditioning display control panel. It adjusts the air supply temperature and speed in real-time according to input signals from various sensors to maintain the optimal air environment inside the vehicle.

[LauraDella]

After driving for so many years, I find the most comfortable temperature for the air conditioning in winter is between 20 to 22 degrees Celsius. If it's set too high, like above 25 degrees, the car interior becomes too dry, making my skin feel tight and causing drowsiness, especially during long drives, which can lead to fatigue. On the other hand, if it's too low, around 18 degrees, it feels chilly and affects concentration. Personally, I prefer setting it at 20 degrees, which feels mild and refreshing. Also, remember not to set the fan speed too high—medium is best, as it avoids excessive noise. Use both the recirculation and fresh air modes: fresh air mode brings in outside air to prevent stuffiness, while recirculation mode heats up the car faster. When the windows fog up, the defogging mode of the air conditioning works best, with a moderate temperature to prevent repeated fogging. Regularly changing the cabin air filter ensures cleaner air and a better driving mood. This temperature range is worry-free, safe, and helps avoid catching a cold.

[Jim]

In winter, I find that setting the car's air conditioning to around 21°C is the most fuel-efficient and eco-friendly. If the temperature is higher, like 24°C, the AC works overtime, increasing engine load and causing fuel consumption to spike. Setting it lower, like 18°C, means manually adjusting it higher later, which isn’t cost-effective. 21°C strikes a good balance—comfortable without wasting energy. For short trips, 20°C is warm enough, while longer trips should maintain at least 21°C for stability. Pairing this with AUTO mode optimizes airflow automatically for better efficiency. Don’t worry about fogging—use the defrost button instead of blindly raising the temperature. A reasonable temperature reduces carbon emissions and is gentler on the car, extending component lifespan. Remember to use the heater only after warming up the engine—saving both electricity and money.

[MacCora]

Safety first, I recommend setting the air conditioning to around 20 degrees Celsius to prevent fogging. When windows are heavily fogged, turn on the air conditioning's dehumidification mode with a moderate temperature to ensure clear visibility without glare. Temperatures that are too high or too low can affect reaction times and increase accident risks, while temperatures above 25 degrees may cause fatigue and drowsiness. I always clear the fog before driving. Smaller temperature differences make for more secure driving.

[VonCole]

I prefer using the AUTO button set between 20 to 22 degrees for maximum convenience. The system intelligently adjusts temperature and airflow—20 degrees quickly warms the cabin comfortably in winter, while 22 degrees feels like a cozy furnace without fuss. For manual adjustments, consider the weather's warmth or chill, and use external circulation to prevent fogging. The automatic airflow optimization ensures quiet comfort. Regular checks keep the system running smoothly.

[ColinFitz]

Setting the car air conditioning to 21°C is the most considerate choice when driving with family. Temperatures above 24°C make children stuffy and drowsy, while below 19°C may cause elderly passengers to catch cold; 21°C provides warmth without dryness. Alternate between internal and external air circulation to maintain airflow and prevent odors. Keep the defogging mode on to ensure clear visibility for safety. Personal experience suggests that preheating the car and AC before departure yields better results.