Does running the AC while parked in summer affect the car?

[DerekMarie]

Running the AC while parked in summer has little impact on the car. At most, it consumes a bit more fuel, but turning off the engine with the AC still running can harm the engine. Running the AC while parked increases engine load: If the owner turns off the engine without turning off the AC, although the AC stops working after the engine is off, the next time the car is started, the AC will default to its last used state and operate simultaneously with the engine. The load from the AC will be added to the engine, and excessive load on the engine can cause strain. Over time, this will inevitably reduce the engine's lifespan. Precautions for car maintenance: It is recommended to turn off the AC before reaching your destination, allowing the AC compressor to not shut off immediately. This protects the compressor and prevents damage to the engine.

[VanNora]

I've been driving for twenty years, and there's a lot to consider when it comes to parking with the air conditioning on in summer. Keeping the engine idling with the AC on for long periods can lead to increased carbon buildup, especially in older cars, causing fuel consumption to spike and damaging the engine. Continuous compressor operation can easily overheat—I've seen cases where the compressor was completely ruined. Exhaust emissions are another hidden danger; never do this in an underground garage. Personally, I turn off the AC and open the windows for ventilation if I'm parked for more than half an hour—I'd rather endure the heat than let the car suffer. Regularly checking the AC filter and refrigerant pressure is also crucial—don't wait until you smell something sour to regret it.

[DeMaverick]

As a parent who shuttles two kids to and from school, I know all too well how unbearable it can be inside a car baking in the summer sun. While briefly turning on the AC to cool down is understandable, the fuel consumption is staggering—over 30% more than normal driving. What’s even more alarming was the time my child nearly suffered carbon monoxide poisoning. It was only later that I learned about the risk of exhaust fumes seeping back into the car at idle. Now, I use my phone to remotely start the AC in advance, so the car is comfortably cool by the time we get in. Another trick is using a foldable sunshade to cover the windshield when parked, which can lower the interior temperature by 5 degrees. These practical tips are worth sharing with fellow moms.

[AnnieRose]

Last year, I helped a friend fix a car with severely depleted battery, all because of running the AC while parked. At idle, the alternator's power can't keep up with the AC's electricity consumption, so the battery silently discharges—it can be drained in just three hours. The compressor's overheating protection will shut it down, and replacing it costs over two thousand. Mold buildup in the ventilation system is another hidden danger, so I always remind my friend to blast the air at high speed for a minute before turning on the AC. Actually, bringing a small rechargeable fan can help relieve the stuffiness, sparing the car the strain and saving fuel.