What is the most fuel-efficient temperature setting for car air conditioning?

3 Answers
AlanMarie
07/29/25 2:00pm
Setting the car air conditioning to the 4th gear is the most fuel-efficient. Here is the relevant information: 1. Fan speed knob: The fan speed knob only adjusts the speed of the fan, and the fan runs on electricity. For a normal car, once the engine starts, the generator is always in operation. Therefore, it does not affect fuel consumption. 2. Function of the red-blue knob: It controls the proportion of cold and hot air intake valves. Turning it to the red side opens the hot air intake valve, while turning it to the blue side opens the cold air intake valve. This function is similar to the mixing valve of a household water heater. The rotary knob should also be connected to a time-delay relay.
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LeAaron
08/13/25 5:41am
I've been driving for over 20 years, and setting the air conditioning temperature around 25°C is the most fuel-efficient, especially during hot summer days. The principle is that the AC compressor relies on the engine to operate. Setting the temperature too low forces it to work continuously, increasing engine load and fuel consumption. Based on my experience, 26-28°C strikes a good balance between comfort and fuel efficiency. I also pay attention to weather conditions. On extremely hot days, I first open the windows to let out the hot air before turning on the AC, which reduces compressor runtime by several minutes. During long trips, I keep the system in recirculation mode to prevent hot air from entering, allowing faster cooling with less effort. Different car models may vary—older vehicles might handle heat less efficiently—but maintaining a reasonable temperature can easily add dozens of kilometers to a full tank of gas.
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Cayden
10/10/25 6:33am
As a car enthusiast, I've pondered many fuel-saving techniques. Running the AC too high or too low wastes fuel, with 25-27°C being the ideal range. The compressor's workload is directly proportional to fuel consumption - setting it to 28°C in hot weather significantly reduces engine starts. A bonus tip is regularly replacing the cabin air filter; less dust enables faster cooling and energy savings. While driving, avoid drastic temperature drops (like from 35°C directly to 18°C) which make the compressor work overtime - gradual adjustment to the comfort zone is smarter. Always consider ambient temperature - setting 26°C on a 30°C day maintains efficient air recirculation. These methods save significant money per liter of fuel while protecting your vehicle's longevity.
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