Does turning on the car's heating consume more fuel?

[LaBentley]

Turning on the car's heating does not consume extra fuel. The details are as follows: 1. The heating system utilizes waste heat from the engine: When the engine's cooling system dissipates heat from the engine operation, a fan directs this dissipated heat into the cabin to provide warmth. When the heating is not in use, the fan stops, and the heating vents close, allowing the heat to dissipate into the atmosphere. Therefore, the car's heating system recycles waste heat and does not consume additional fuel. 2. The air conditioning (cooling) system works differently: It compresses refrigerant to liquefy and then vaporize it, absorbing a significant amount of heat from the air. When the air conditioning is on, the compressor pulley drives the compressor, increasing the engine's load and consuming a certain amount of fuel.