How much does fuel consumption increase when idling with air conditioning on for one hour?

[DeHarrison]

Idling with air conditioning on for one hour increases fuel consumption by 1-2L. The reason is that when the air conditioning is turned on in summer, the air conditioning compressor needs to work to cool. The air conditioning compressor cannot work on its own; it relies on the engine to drive it, which consumes part of the engine's power. This is why using air conditioning for cooling affects fuel consumption. Hazards of idling with air conditioning on: 1. It causes some damage to the car: The impact is not too significant, and the car won't break down, but it does cause some wear and tear on the engine, possibly shortening the maintenance cycle (such as oil changes and other upkeep). 2. High fuel consumption: Avoid idling with air conditioning on for extended periods. Prolonged use of air conditioning with the system in recirculation mode will gradually lead to poor air quality inside the car, with increasing levels of harmful gases (carbon monoxide, nitrogen oxides, etc.), which can endanger health and even life safety.