How long can a car idle with the air conditioning on?

[OHolden]

There is no specific regulation on how long a car can idle with the air conditioning on, but it is recommended not to exceed one hour. Prolonged idling with the air conditioning on not only harms the vehicle but, more importantly, poses significant health risks to occupants, even threatening their well-being. When a car's engine is running, incomplete combustion of gasoline in the cylinders can produce high concentrations of carbon monoxide. While driving, the air conditioning system facilitates air convection, keeping carbon monoxide levels low inside the car. However, when the car is stationary with the air conditioning on and windows closed, the lack of air circulation can allow carbon monoxide from the engine to seep into the cabin and accumulate, increasing its concentration. This can lead to poisoning or even suffocation. Therefore, avoid running the air conditioning in poorly ventilated areas to prevent carbon monoxide buildup and oxygen deprivation. The car's air conditioning system is designed to cool, heat, ventilate, and purify the air inside the cabin, providing a comfortable environment for passengers, reducing driver fatigue, and enhancing driving safety. It is advised not to idle with the air conditioning on for extended periods, as this not only wears out the engine but also keeps the air conditioning in recirculation mode, gradually contaminating the cabin air and increasing harmful gas levels, which can endanger health.