Which affects my car’s energy efficiency more: raising/lowering the setting on my car’s air conditioner, or raising/lowering the fan speed? Is there a most-efficient setting?
In: Engineering
It somewhat depends on the age of your car. If it’s less than 20 years old or so, changing the requested temperature will make a somewhat significant difference to the efficiency. The fan speed is basically inconsequential. The difference in engine load between fan off and full speed is probably similar to a couple of psi in your tires.
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