1. Choose the appropriate air conditioning temperature. Of course, in summer, many people like to set the temperature very low. Little do we know that when the temperature is set too low, it can affect our health, so the temperature adjustment of the air conditioner must be appropriate. The most suitable temperature for the human body is between 20 ℃ and 25 ℃. If it exceeds 28 ℃, people will feel stuffy and hot. And below 14 ℃, people will feel cold. Therefore, the air conditioner should control the temperature inside the car between 18 ℃ and 25 ℃, as too low a temperature can easily cause illness.

2. Start the internal circulation immediately when entering the car in summer. When cars are parked under the scorching sun for a long time, some car owners like to immediately turn on the air conditioning and internal circulation as soon as they start the car, thinking that this can make the temperature inside the car drop faster. But because the temperature inside the car is higher than outside, this is actually not effective. When you first enter the car, you should open the window for ventilation and turn on the external circulation to exhaust all the hot air. After the temperature inside the carriage drops, switch to internal circulation.

3. People know to use air conditioning in a fully enclosed state. The same goes for car air conditioning. If the doors and windows are not tightly closed during use, it will result in poor cooling effect and waste of fuel.

4. The direction of the air outlet can be adjusted freely. Some car owners do not pay attention to adjusting the direction of the air conditioning when using it, which is not conducive to achieving the best effect of the air conditioning. According to the principle of cold air sinking and hot air rising, the correct approach should be to turn the air outlet upwards when turning on cold air and downwards when turning on warm air.

5. Keep the air conditioning on for a long time. Some car owners often keep the air conditioning on after getting in the car, but prolonged use of the air conditioning can cause excessive pressure in the condenser, which can cause damage to the refrigeration system. Air conditioning is a heavy burden on the engine, and the engine itself is a heating element, let alone in hot weather. Some small displacement cars may even experience water boiling in this situation, which affects driving and reduces air conditioning efficiency. Therefore, it is not advisable to use the air conditioner for too long each time. If the temperature inside the car has reached a comfortable level, you can turn off the air conditioner and turn it on again after a while.

6. Do not smoke in the car with the air conditioning on. Due to smoking in the carriage, the smoke cannot be immediately expelled, which irritates the eyes and respiratory system and is not conducive to health. If smoking, the air conditioning ventilation control should be adjusted to the "exhaust" position to allow the smoke in the carriage to be expelled from the outside.

7. Do not take long breaks or sleep in a parked car with air conditioning on. Due to the good sealing of the car, the ventilation inside the cabin is poor when the vehicle is stopped. If the air conditioning is turned on to rest or sleep at this time, it is likely to cause poisoning or even death due to the leakage of carbon monoxide gas emitted by the engine into the car.

8. Try not to use air conditioning when driving at low speeds. When encountering traffic congestion while driving, do not run the engine at a high speed to improve air conditioning efficiency, as this has a negative impact on the service life of both the engine and air conditioning compressor.

9. Turn off the engine first and then turn off the air conditioning. Some car owners often remember to turn off the air conditioning after turning off the engine, which is harmful to the engine because the engine will start with the air conditioning load the next time the vehicle is started, and such high load will damage the engine. Therefore, after each parking, the air conditioning should be turned off before turning off the engine, and the air conditioning should also be turned on after the vehicle has been started for two to three minutes and the engine has been lubricated.