Is it better to use internal or external air circulation when turning on the air conditioning?
3 Answers
Generally, internal air circulation is more commonly used when driving with the air conditioning on. Here are the specific introductions to internal and external air circulation in cars: 1. External air circulation: External air circulation refers to drawing air from outside the car, directing it into the air conditioning system for heating or cooling, and then blowing it out through the vents. Essentially, external air circulation replenishes fresh air and improves the air quality inside the car. It is used for defrosting in winter or defogging in summer because the air drawn from outside is richer in oxygen and drier, making it more effective for these purposes. 2. Internal air circulation: Internal air circulation draws air from inside the car, creating a cycle of air flow within the vehicle. The main function of internal air circulation is to effectively prevent external dust and harmful gases from entering the car. It helps the car warm up faster in winter and cool down quicker when the air conditioning is on in summer. It can also be used during smoggy days. Internal air circulation maintains the air inside the car, helping to better preserve the interior temperature.
To be honest, I often struggle with whether to use recirculation or fresh air mode when running the AC on hot driving days. When I first got my license, I didn't know any better and always used fresh air mode - the AC cooled slowly, fuel consumption was high, and it took forever for the car to cool down. With more experience, I've figured out the trick: for quick cooling, recirculation mode is best because it rapidly chills the cabin air, reduces engine load, and saves fuel efficiently. However, in city traffic jams, prolonged recirculation makes the air stuffy, so I usually switch to fresh air mode or crack a window after about 10 minutes. This maintains coolness while preventing dizziness. Remember, in areas with good air quality like suburbs, occasionally using fresh air mode can improve cabin air. The key is flexibly switching modes based on actual conditions - don't operate rigidly. Safety and comfort come first.
As a driver who is very conscious of fuel consumption, I believe that using the air conditioner in recirculation mode should be prioritized. I've been driving this way for several years and have clearly noticed fuel savings, as the AC doesn't need to cool additional hot outside air, making the cooling much more efficient. At first, I didn't understand and used the fresh air mode indiscriminately, which caused my car's fuel consumption to skyrocket in summer. Now I've learned: after starting the car, switch to recirculation mode first to cool down quickly, then adjust as needed. For example, on highways where air circulation is good, you can switch to fresh air mode for a change of air; in city traffic jams, use fresh air mode less to avoid exhaust fumes entering the cabin and affecting health. In fact, this habit also protects the AC system and extends its lifespan. If you try this method, you'll likely notice the difference. Let's start with small steps to save energy and protect the environment.
