In hot weather conditions like in Vietnam, the demand for air conditioning usage increases significantly. However, many people find that their air conditioners don't cool effectively even when set to low temperatures. So, what causes the air conditioner to run but not cool? Let's explore the reasons behind this with Mytour!
Dirty air filter
If an air conditioner operates for an extended period without proper cleaning, dust and dirt can accumulate on the air filter, reducing the amount of cool air blown out. This is a common issue that causes the air conditioner to run at full capacity without effectively cooling the room.

Regular cleaning of the dust filter is essential to ensure efficient operation of the air conditioner.
The dust filter of an air conditioner functions to filter out dirt in the air before passing through the evaporator coil to reduce heat and then blowing it back into the room. If dust accumulates heavily on the filter, it will obstruct the airflow through the coil, resulting in no cold air being blown out. Failure to clean the dust filter thoroughly can lead to dirt buildup on the evaporator coil, causing damage and reducing the cooling efficiency of the unit. Therefore, it is necessary to clean the dust filter system regularly every 3-6 months to ensure the most efficient operation of the equipment.
Low refrigerant level in the air conditioner
The refrigerant used in air conditioners absorbs heat from the evaporator coil and transfers it to the condenser coil to release heat into the environment. Poor cooling or lack of coldness in the air conditioner indicates low or depleted refrigerant levels. In such cases, even when the air conditioner is set to the lowest temperature, there may be no cool air emitting or it may be very weak. Refrigerant loss in the air conditioner due to prolonged usage without maintenance can result in leaks in the pipes, welds, etc.
Some high-end air conditioners nowadays come with gas status sensors. When the air conditioner is running low on gas, the system will alert the user. To remedy this situation, it is necessary to call a skilled air conditioner technician to recharge the gas to ensure the unit operates smoothly.
Insufficient electrical load
During hot sunny days, the demand for electricity in households increases, leading to electrical overload in many areas. Weak and unstable power sources cause the compressor to overheat, resulting in poor cooling performance or shutdown. In some cases, electrical fluctuations can even cause fires or damage the internal circuit board of the equipment.

Insufficient power supply leads to inefficient cooling operation of the air conditioner.
To address this issue, users in areas with weak electricity should turn off unnecessary electrical devices, avoid peak hours (6-8 pm), or purchase a voltage stabilizer to ensure sufficient power supply for the unit, ensuring it operates well to meet the family's cooling needs promptly.
Installing the air conditioner on a hot wall
Many people install air conditioners on walls exposed to direct sunlight, which reduces the unit's cooling efficiency. Because before cooling the air in the room, the air conditioner must cool the wall first, which not only consumes electricity but also makes the unit operate inefficiently. Therefore, you should choose cool wall corners for installation to allow the air conditioner to cool the room quickly and achieve the highest efficiency.
In addition, the choice of the outdoor unit installation location also significantly affects the cooling operation of the unit. Users should install the outdoor unit in a ventilated space with airflow, avoiding cramped spaces, close to metal roofs, or direct sunlight exposure.

The outdoor unit of the air conditioner should be placed in a well-ventilated location.
Room size mismatch with capacity
Installing an air conditioner with low cooling capacity in rooms larger than the unit's cooling capacity can lead to difficulty in achieving rapid and effective cooling and increase the likelihood of early malfunctions due to continuous full-capacity operation.
Energy-saving air conditioner models - Inverter
1. Samsung Inverter Air Conditioner 1.0 HP AR10RYFTAWKNSV – Price: 8,790,000 VND
The Samsung Inverter 1.0 HP AR10RYFTAWKNSV air conditioner features a sleek white design that will bring a harmonious and eye-catching beauty to your home interior space. Not only does it save electricity, but the Inverter technology of the air conditioner also provides smooth, durable operation with extremely stable temperatures. You will no longer feel uncomfortable due to noise during operation.
Cooling Capacity (BTU): 9,200 BTU
Cooling Capacity (HP): 1.0 HP
Room volume: Below 45 m3
Copper tube: 6/10
Average power consumption: 915W
Quick cooling feature
Turn on/off display screen
Turn on/off beep sound
Fan mode: Auto or manual adjustment
Gas type: R-32
Manufacturer: Samsung (Brand: South Korea)
Manufactured in: Thailand
Warranty: 24 months
Minimum copper pipe installation length: 3m
If used for business operations (laundry, restaurants, hotels...): No warranty

Samsung Inverter Air Conditioner 1.0 Hp AR10RYFTAWKNSV
2. Sharp Inverter Air Conditioner 1.0 HP AH/AU-X9VEW - Price: 7,990,000 VND
The Sharp Inverter 1.0 HP AH/AU-X9VEW air conditioner retains Sharp's traditional design but this model has sharper edges, looking very robust and extremely elegant, suitable for various interior spaces. The J-TECH Inverter technology operates more smoothly with 15 levels compared to conventional Inverter air conditioners which only have 7 levels. This helps the unit adjust to more levels to meet cooling needs more effectively and comfortably. Especially in energy-saving mode, it can reduce power consumption by up to 60% compared to conventional air conditioners.
Cooling Capacity (BTU): 9,000 BTU
Cooling Capacity (HP): 1.0 HP
Room volume: Below 45 m3
Copper tube: 6/10
Average power consumption: 0.8 kW/h
Power supply: 220V/50Hz/1.5A
Features: Breeze mode (natural wind), Instant cooling, Auto restart on power resumption, Programmable timer, Auto temperature adjustment (night mode), Gentle airflow (for children, elderly), Children's sleep mode
Instant cooling
Turn on/off display screen
Turn on/off beep sound
Fan mode: Auto or manual adjustment
Gas type: R-32
Indoor unit dimensions: 877/292/222 (width/height/depth) (mm)
Outdoor unit dimensions: 598/495/265 (width/height/depth) (mm)
Indoor unit weight: 8 Kg
Outdoor unit weight: 21 Kg
Manufacturer: Sharp (Brand: Japan)
Manufactured in: Thailand
Warranty: 12 months
Minimum copper pipe installation length: 3m
If used for business operations (laundry, restaurants, hotels...): No warranty

Sharp Inverter Air Conditioner 1.0 HP AH/AU-X9VEW
Hope that with the information provided by Mytour, it can help you find the cause of the air conditioner not cooling despite being operational, to take timely measures and avoid damaging the machine.
Mytour
