What is the normal temperature for car air conditioning?

[DelWilliam]

Car air conditioning temperatures vary depending on different conditions: 1. In summer, the temperature should be between 21°C to 25°C; 2. In winter, the air conditioning temperature should be between 25°C to 28°C; 3. The temperature difference between the inside and outside of the car should be within 10°C for passenger cars and between 8°C to 12°C for large buses. Car air conditioning, short for car air conditioning system, is used to adjust and control the temperature, humidity, air cleanliness, and air flow inside the car cabin to an optimal state. Its functions are: 1. To provide a comfortable riding environment for passengers and reduce travel fatigue; 2. To create good working conditions for the driver and ensure driving safety.

[MacMolly]

Having driven for over a decade, I mainly rely on two temperatures when using the air conditioning: one is the vent temperature. I've measured it several times with a thermometer. During summer cooling, the vent temperature is between 5-10°C, feeling icy and prickly to the touch. In winter heating, it needs to be at least 45°C or higher to warm my back. However, the more important factor is the perceived comfort. When driving, I prefer setting the temperature knob to around 22°C for optimal comfort—any lower and my arms get goosebumps, any higher and I start sweating. If the air isn’t cooling properly, it’s most likely due to refrigerant leakage or the condenser being clogged with dirt. Just last week, my car’s AC was blowing air like a fan because the cabin air filter hadn’t been changed for six months. Replacing the filter immediately restored the icy-cool airflow.

[LaEmmanuel]

Last time I took the kids on a road trip, I realized there's a trick to adjusting the AC temperature. In my car, setting it to 24°C feels just right in the front, but the kids in the back always complain it's too cold. A mechanic told me this is related to the AC zoning—most cars actually have single-zone temperature control. Now I’ve gotten into the habit of directing the vents upward so the cool air spreads more evenly as it descends. Another tip is to avoid blasting the lowest temperature right after the car has been baking in the sun. Instead, open the windows for two minutes to ventilate first, then set it to 23°C. This way, the compressor is less likely to fail. Last year, this trick helped me avoid a major repair.

[Jason]

As an engineering graduate, I've specifically measured car air conditioning data: the outlet temperature should be between 4-7°C during cooling to be considered qualified, and using an infrared thermometer to measure the air outlet is the most accurate. However, many people overlook the temperature difference. I've recorded that when the dashboard is set to 25°C, the actual interior temperature fluctuation between 23-28°C is normal. The key is whether it can lower the temperature by 10°C within ten minutes, which is more important than the absolute temperature. Last time, a friend's car was slow to cool down, and upon inspection, we found the cooling fan was stuck.

[PresleyLee]

Having been in the transportation business for over a decade, I value air conditioning stability the most. A good AC system maintains temperature within ±2°F of the set point (e.g., 78°F) for 30+ minutes. Many older vehicles suffer from temperature fluctuations because dust coats the sensors. While modern cars can regulate to within 1°F, avoid frequent adjustments - compressor cycling increases fuel consumption. Here's a quick test: Place your palm near the vent for 10 seconds. If it feels numb from cold, the cooling system is functioning properly.

[OKylie]

I remember when I first bought the car, I always set the AC to the lowest temperature, which resulted in two repairs within three months. The mechanic said prolonged use of LO mode can cause icing and clog the pipes. Now I consistently set it to 25°C. Actually, the ideal temperature varies by season: in summer when it's 35°C outside, keeping the car interior at 22-25°C is most reasonable, while in winter it should be above 18°C to prevent fogging. Last week, I noticed the AC wasn't cooling enough—it turned out leaves were blocking the air intake, and it worked fine after clearing them. Regular maintenance is key to worry-free AC operation.