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What are the effects of keeping the air conditioning on while the car is idling without driving?

2 Answers

XavierAnn

08/30/25 8:08am

Keeping the air conditioning on for extended periods while the car is not in motion can harm the vehicle's battery. Here are the relevant details: 1. Impact on the car: Prolonged use of the air conditioning can cause excessive pressure on the condenser, leading to wear and tear on the cooling system. Therefore, it is advisable not to use the air conditioning for too long at a time. If the interior temperature has reached a comfortable level, you can turn off the air conditioning and turn it back on after a while. This practice is harmful to the engine because, during the next startup, the engine will have to bear the additional load of the air conditioning, which can cause damage due to the high strain. 2. Impact on human health: When the car's engine is running, incomplete combustion of gasoline in the cylinders can produce high concentrations of carbon monoxide. While the car is moving, the air flow through the air conditioning system creates convection, keeping the carbon monoxide concentration inside the car low. However, when the car is stationary with the air conditioning on and the windows and doors closed, the air inside cannot circulate. If carbon monoxide from the engine leaks into the car, it can accumulate and reach dangerous levels, potentially leading to poisoning or even death.

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Elliot

09/12/25 5:01am

I always tell my friends that the biggest danger of starting the car just to run the AC without driving is carbon monoxide poisoning, especially when you do this for a long time in an enclosed space like a garage or tent. The exhaust fumes can accumulate highly toxic gases, which, when inhaled, may cause dizziness, vomiting, or even unconsciousness. I've seen many cases like this on car forums. Another major issue is the high fuel consumption—idling for an hour can burn half a liter to a full liter of fuel, which is like wasting money and polluting the air for nothing. My advice is to limit AC use to no more than 15 minutes during short outdoor breaks, open the windows for ventilation to stay safe, and avoid sleeping in the car overnight—this habit can really be deadly.

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