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Which one is more energy/fuel efficient to cool the inside of the car: lower thermostat + lower fan speed, or slightly higher thermostat + higher fan speed?

On a hot day and traveling in a car, which method of keeping the occupants comfortable with the A/C is more energy and fuel efficient?

  • Set the thermostat to a lower temperature and keep fan speed to the lowest setting

  • Set the thermostat to a slightly higher temperature and compensate by setting the fan to a higher speed so you can feel cool enough with the breeze

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