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What are the reasons for high fuel consumption when using air conditioning?

2 Answers

LePiper

07/25/25 5:07pm

The reason for high fuel consumption when using air conditioning is: after turning on the AC button, the compressor operates, increasing fuel consumption. The functions of car air conditioning: 1. Achieve cooling effect through the continuous state change cycle of refrigerant; 2. Remove dust, odors, smoke, and toxic gases from the air inside the car, making the interior air fresh, and humidify the interior air to increase its relative humidity. The method of using car air conditioning is: 1. Turn on the AC switch; 2. Adjust the air outlet selection knob, direct the air outlet upward when cooling and downward when heating; 3. Adjust the fan speed switch; 4. Adjust the air circulation conversion knob; 5. Adjust the temperature control knob.

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VanRiley

08/11/25 10:04pm

After driving for so many years, I've noticed that using the air conditioning in summer really drives up fuel consumption, making my wallet weep. The key issue is that the AC compressor is driven by the engine, essentially adding a significant load to the vehicle. The engine already has to maintain forward motion, and now it must also divert power to the cooling system—especially during low-speed driving or traffic jams with frequent stops and starts, when compressor operation consumes even more fuel. If the cabin air filter is clogged or refrigerant levels are low, the compressor will strain to operate, worsening fuel efficiency. Setting the temperature too high or cranking the fan to maximum also increases system load. To save some fuel, consider using the AC on highways (where open windows create drag) and clean or replace filters regularly to maintain cooling efficiency. Routine vehicle maintenance checks can also mitigate this impact—don’t underestimate AC upkeep; it genuinely helps.

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