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Does turning on the AC while using the heater consume more fuel?

1 Answers

Gerald

07/30/25 2:27am

Using the car heater with the AC turned off does not consume additional fuel. Function of the heater: The warm air comes from the heat generated by the engine during operation: When the engine's cooling system dissipates heat from the engine, the dissipated heat is blown into the car by a fan to form warm air; when the warm air is not in use, the fan stops running, and the warm air outlet closes, allowing the dissipated heat to be completely released into the atmosphere. Therefore, the warm air from the car is a form of waste heat recovery and does not consume gasoline. Function of the AC: Cold air is formed by pressurizing the refrigerant through the compressor, causing it to liquefy and then vaporize, absorbing a large amount of heat from the air; when the cold air is turned on, the compressor pulley drives the compressor to work, increasing the engine load and consuming a certain amount of fuel.

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