1. Dust accumulation on evaporator and fan: After long-term use, a large amount of impurities will be superimposed on the evaporator, making it difficult to operate. Fans are also prone to dust deposition, resulting in increased noise.

2. Fan problem: fan failure or wear of support (such as shaft sleeve) leads to increased friction and noise.

3. The filter screen is dirty and blocked: if the filter screen is not cleaned in time, more and more dust and small debris will gather on it, which will increase the air resistance and make the compressor need more power to achieve the set refrigeration effect and increase the noise.

4. Electrical failure: The operation of air conditioner is controlled by electrical appliances. If the line leaks, the current is too large, too small or variable, which will lead to abnormal operation of the unit, and it is normal to have noise.

5. Improper installation location: If the installation location of the air conditioner conflicts with items such as room structure, it is easy to cause excessive blowing noise.

If you encounter the problem that the air conditioner blower is too loud, you can do the following:

1. Clean the filter screen and evaporator in time: keep indoor air circulation, regularly maintain the air conditioner, and remove internal dust and impurities.

2. Regular maintenance: Professional personnel shall inspect and maintain the electrical wiring, fittings and refrigerant filling to ensure smooth operation and reduce noise.

3. Adjust the position and posture: according to the room layout and usage habits, rearranging the position and orientation of the air conditioner, such as the direction of the window, may affect the mute effect.

4. Try to choose a low-noise model: when buying an air conditioner, pay attention to detailed parameters, display the decibels of various sounds, and choose a low-noise brand model.