Is it better to use internal or external air circulation in summer?

[LeBrooklyn]

In summer, it is better to use the internal air circulation mode. When the ambient temperature is very high, using the external air circulation mode with the car air conditioning can lead to significant loss of cooling capacity, resulting in higher fuel consumption and increased fluctuations. Most of the time, internal circulation should be used. When the air quality inside the car is poor and the external temperature is not too high, external circulation can be appropriately used to improve the air quality inside the car. Using internal circulation when cooling with the air conditioning in summer is obviously more energy-efficient, but prolonged use of internal circulation is not ideal either. It is advisable to open the windows occasionally to let in fresh air and then close them to continue with internal circulation. Generally, it is recommended to start with external circulation to expel hot air, then switch to internal circulation after a while for better cooling effect.