Does the car air conditioning consume the same amount of fuel regardless of the setting?

[Jane]

Car air conditioning does not consume the same amount of fuel at different settings, as detailed below: 1. Variable displacement compressor: If the car is equipped with a variable displacement compressor, when the temperature is set lower, the compressor needs to maintain a high displacement state for a longer time, resulting in higher fuel consumption. When the temperature is set higher, the compressor can reduce its displacement, decreasing the engine load and thus lowering fuel consumption. 2. Fixed displacement compressor: If the car has a fixed displacement compressor, it operates at full capacity initially, regardless of the air conditioning temperature setting. After running for a while, if the evaporator temperature is too low or the air conditioning pipeline pressure is too high, the compressor will stop working. When the air conditioning temperature is set too low, the fixed displacement compressor has to restart immediately, leading to increased fuel consumption.