How Much Does Using Air Conditioning Increase Car Fuel Consumption in Summer?

[LaneAnn]

For most family cars, the displacement is generally between 1.3-2.5L, and the fuel consumption is usually 6-10L/100km. After turning on the air conditioning, the fuel consumption typically increases by 10-15% of the original consumption, resulting in an additional 0.6L-1.5L per 100 kilometers. Related details are as follows: 1. Reason: In daily use, when the AC button is pressed, the air conditioning compressor needs to perform cooling work. Since the car's air conditioning compressor is directly driven by the engine, it consumes part of the engine's power, thus increasing fuel consumption. 2. Compressor: If it is a fixed displacement compressor, there is no need to deliberately adjust the temperature and fan speed, because for cars with fixed displacement air conditioning pumps, as long as the air conditioning is on, the fuel consumption is almost fixed, regardless of the temperature setting or fan speed. On the other hand, for variable displacement compressors, fuel consumption is related to the temperature setting.

[Ezra]

Turning on the car air conditioning in summer definitely increases fuel consumption. Based on my experience driving various cars, I've noticed that during city traffic jams or at numerous traffic lights, the fuel gauge drops noticeably faster—typically by about 10% to 20%. If the car has been parked outside on a hot day and you turn on the AC right after getting in, the increase might even reach 25%. The reason is simple: the AC compressor is driven by the engine, which increases the engine load, requiring you to press the accelerator harder. On highways, the impact is relatively smaller, with fuel consumption increasing by only around 5%, thanks to lower wind resistance. I often remind my friends to regularly check the AC system—such as refilling refrigerant or cleaning the filter—to improve efficiency and reduce fuel waste.

[DelJameson]

It's normal for fuel consumption to increase when the car's air conditioning is turned on. I've personally noticed this phenomenon while driving. On average, it increases by 10%-15%, depending on the vehicle model. SUVs or high-displacement vehicles see slightly higher increases, while smaller cars are less affected. The compressor is driven by the engine, consuming engine power and adding to the load. This is particularly noticeable in summer, especially during frequent stops and starts in traffic jams. Maintenance is crucial—a dirty air filter can increase energy consumption, and regular maintenance can save some fuel. For safety, don't turn off the air conditioning to save money, as high temperatures can easily lead to fatigue while driving.

[Jose]

Turning on the air conditioning definitely increases fuel consumption, as I've experienced from actual driving. It typically increases by 10% to 20%, depending on driving conditions. For example, slow city driving with traffic jams, where the compressor starts and stops repeatedly, can cause a sharp rise in fuel consumption. The reason lies in the compressor consuming engine power. The impact is slightly less after maintenance, such as cleaning the condenser. Opening the windows for ventilation before closing them and turning on the air conditioning can reduce the load a bit. Don't sacrifice comfort just to save fuel.