Does turning on the heater when starting the car consume more fuel?

1 Answers
CoraLynn
07/29/25 1:12pm
Turning on the heater when starting the car does not consume more fuel. The working principles of heating and air conditioning are different: 1. Air conditioning works by pressurizing the refrigerant through a compressor to liquefy it, then vaporizing it to absorb a large amount of heat from the air to achieve cooling. When the air conditioning is turned off, the mechanical connection disengages, the compressor pulley idles without the compressor working, thus not increasing the engine load. When the air conditioning is turned on, the connection engages, the compressor pulley drives the compressor to work, increasing the engine load and consuming a certain amount of fuel. 2. The heating system, on the other hand, uses the engine's cooling system to transfer heat generated during engine operation into the car cabin via a small fan. When the heating is turned off, the fan stops, and the heat vents close, allowing the heat to dissipate into the atmosphere.
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