Can I Keep the Air Conditioning On While Parked?
3 Answers
It is not recommended to keep the air conditioning or other electrical systems like the entertainment system running while parked, as this can quickly drain the battery and potentially harm it. Here are more details on the potential risks: Battery Drainage: While the air conditioning compressor is indeed driven by the engine, the blower fan that circulates the air is powered by the car's battery. When the car is idling, the alternator may not sufficiently recharge the battery. Prolonged use of the blower fan can lead to chronic battery drainage. Risk of Carbon Monoxide Poisoning: Running the air conditioning while parked means the engine is operating at idle speed, which can result in incomplete fuel combustion. If the windows and doors are closed, the poorly combusted exhaust fumes can enter the cabin, increasing the risk of carbon monoxide poisoning for the driver.
Keeping the air conditioning on while parked is not a good idea in my opinion. I used to do this when driving—turning on the AC to sleep in the car during scorching summers—but later, professionals warned me about the serious safety risks. If your car's engine is still running, it emits harmful gases like carbon monoxide, especially in enclosed spaces such as garages or underground parking lots, where gas buildup can easily lead to poisoning. I’ve heard of several accident cases where people faced emergencies due to sleeping in a parked car with the AC on. So now, I always recommend parking in open areas. If you must use the AC, cracking the windows slightly for ventilation is better, but don’t do it for extended periods—safety comes first. Additionally, this habit increases fuel consumption and engine wear, making it uneconomical in the long run. Occasionally using the AC for short periods while parked is fine, but keeping it on continuously is best avoided.
From an environmental perspective, it's unnecessary and not energy-efficient to keep the air conditioning running while parked. I always think we should save resources whenever possible. Keeping the engine idling consumes a lot of gasoline and emits pollutants that harm the environment. I recall data showing that idling with the AC on can burn several liters of fuel per hour, equivalent to the fuel consumption of driving several kilometers. Moreover, it's not good for the car itself—the battery can easily drain, and older cars might wear out prematurely. Personally, I make it a habit to turn off the engine when parked. If it's hot, I open the windows for ventilation or find a shady spot to rest. During summer naps in the car, sunshades or small fans can easily replace the AC, saving money and being eco-friendly. If you really need the AC, it's best to limit it to 10 minutes. Developing good habits benefits both the planet and your wallet.
