Should the AC Button Be Set to ON or OFF When Using the Heater?

1 Answers
VanEli
07/25/25 3:51am
When using the heater, the AC button should be set to OFF, meaning it is in the closed state, because turning on the AC is unnecessary when using the heater in winter. AC stands for Air-conditioning, which refers to air conditioning regulation. In the summer, pressing the AC button activates the compressor, which compresses air to blow out cold air. However, in winter, the car requires warm air to continuously raise the interior temperature to a level comfortable for the human body. The warm air is provided by the engine, which generates a significant amount of heat while running. At this time, the heat only needs to be directed into the air conditioning system, and warm air can then be blown out through the vents, so there is no need to turn on the AC button. Using the heater in winter does not increase fuel consumption. This is because the warm air blown out by the heater is generated by the engine's operation. Even if the heater is not used, this heat would still be expelled outside the car. In a way, using the heater in winter actually reduces the burden on other components of the car, such as the engine's cooling system. However, it is important to note that the heater should not be used for extended periods in winter. While the engine generates heat, it also produces harmful gases that can enter the car through the air conditioning system. Therefore, when using the heater in winter, it is advisable to open the windows periodically to ventilate the car, preventing significant harm to the human body.
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