Why is the air conditioner still not cold when turned on to the maximum?
Every year in April, the temperatures in Taipei and New Taipei begin to soar. I turned on the air conditioner and set it to 22 degrees for strong cooling. After waiting for half an hour, the room was still stuffy. This situation is particularly common in the old Shuangbei community.
The most commonly overlooked reason why the air conditioner is not cold is that the inside is too dirty. Many people think that washing the filter is enough, but the real source of dirt is inside: the cold radiator (evaporator) and the air blower. When these areas are filled with dust and mold, cold air cannot be blown out at all. According to the experience of the home appliance cleaning industry, the filter can only block large particles of dust. The accumulation of scale on the internal cooling radiator and air blower will cause the efficiency of the cooling room to decrease and the power consumption to increase by 15% to 30%.
Another common reason is insufficient refrigerant, but the refrigerant does not disappear out of thin air - usually there are tiny holes in the pipelines that cause the refrigerant to leak. This situation requires a professional master to use instruments to detect it, and DIY cannot handle it. As for the smell, most likely the fins and drum inside the air conditioner are moldy, and the mold spores are blown out by the wind. For people with children or allergies at home, this is not only a smelly problem, but also a health problem.
DIY cleaning steps: things you can do yourself
If you have some hands-on skills, here are a few things you can do yourself first:
Step one: Completely cut off the power supply
This is no joke. Instead of turning it off with the remote control, you need to go to the distribution box and turn the fuseless switch on the air conditioner side to OFF. If you are not sure which one, just turn off the main switch, safety first.
Step 2: Clean the filter
Open the air-conditioning panel and pull out the filter. First use a vacuum cleaner to remove the dust on the surface, then rinse it with clean water. If it is very dirty, add a little neutral dishwashing detergent, brush it lightly with a soft brush, rinse it clean and place it in a cool place to air dry naturally. Never expose it to the sun or use a hair dryer, as the filter will deform.
Step 3: Clean the air outlet and fan blades
This is the place where mold is most likely to grow. You can buy a commercial air conditioner cleaning spray, spray it evenly on the air outlet and fan blades, let it sit for 10 to 15 minutes to let the foam break down the dirt, and then wipe it with a clean cloth. Be careful not to brush randomly with a hard brush. The fins are very soft and will deform when pressed.
Step 4: Drying in air supply mode
After cleaning and assembling, don’t rush to turn on the air conditioner. Switch to the "air supply" mode and run for one to two hours to allow the inside of the machine to completely dry. This little habit is also very practical. Every time after blowing the air conditioner, turn on the air for 15 minutes before turning off the machine, which can greatly reduce the growth of mold.
In what situations must we seek help from a professional?
If you encounter the following conditions, DIY will not only have limited effect, but may also damage the machine:
- Insufficient refrigerant: The air conditioner will blow but not be cold. Professional tools are needed to detect the refrigerant pressure and replenish it.
- The air drum is moldy deep in the air drum: The air drum is deep inside the machine body and needs to be disassembled for thorough cleaning. Commercially available sprays can only touch about 15% of the surface area, but professional cleaning can clean up to 99%.
- Clogged drain pipe: Water dripping from the indoor unit is usually caused by a clogged drain pipe that requires high pressure to clear.
- Compressor abnormality: The outdoor unit operates loudly or does not operate at all. This requires professional judgment.
Professional cleaning vs DIY: Comparison of costs and effects
Based on the market trends in Taipei and New Taipei in 2026, the cost of professional deep cleaning of split air conditioners is about $2,000 to $3,500, window air conditioners are about $2,500 to $4,500, and ceiling air conditioners are about $3,000 due to higher construction difficulties. to $6,000. The price of PRO360 online is also at $2,500 to $3,500, and there is usually a 20% discount during the off-season.
In comparison, a can of commercially available air-conditioning cleaning spray costs about $200 to $400. The price is much different, but the effect is also much worse. The key difference between professional disassembly and cleaning is that the master will do circuit protection, use high-pressure water jets to thoroughly flush the drain pipes, use environmentally friendly chemicals that will not damage the machine body, and usually come with a construction warranty.
The recommended frequency is: for general families, wash once a year, and for families with newborns or pets, wash once every six months. If your air conditioner smells sour and musty when you turn it on, small black spots appear on the fan blades at the air outlet, or the air volume decreases significantly, it means that the internal dirt is very serious, so don't delay.
Be careful! The "fake original factory repair" trap on the Internet
This is particularly important because many consumers in Taipei and New Taipei have fallen into this trap. The Consumer Council announced in April 2026 that the Internet is full of repair websites set up under the names of well-known brands. These websites have no authorization or cooperative relationship with the original brand manufacturers, but use keyword advertising to rank their websites at the top of search results.
To give a real case: Due to an air conditioner failure, a consumer found a "branded air conditioner repair station" through Internet searches. The operator took the equipment back for repairs, but it was not returned after several weeks. The consumer failed to contact the operator multiple times and was unable to even confirm the business address of the operator. In the end, he had to buy a new equipment.
Consumers are reminded that when looking for repair services, they should first check the brand's official website to confirm whether it is an authorized repair station, and keep transaction records and receipts; if a dispute occurs, they can appeal to the local government consumer service center or the Consumer Council. Don’t end up spending a lot of money and getting frustrated just because you are in a hurry to get air-conditioning.
New knowledge on air-conditioning power consumption and Taiwan climate maintenance regulations in recent years (2025-2026 current situation)
With the high temperatures in summer breaking historical records and the adjustment of electricity price structure in recent years, the latest statistics from the Energy Administration of the Ministry of Economic Affairs show that air-conditioning equipment accounts for more than 47% of residential electricity consumption in summer. Many people mistakenly believe that if the air conditioner is not cold, they only need to "replenish the refrigerant." However, in fact, refrigerant is not naturally consumed during normal operation in a closed circuit. If the refrigerant is insufficient, it means that there are micro leaks in the copper pipes or joints. Simply replenishing the air conditioner will only treat the symptoms but not the root cause. Refrigerant leakage will aggravate the high temperature overload of the compressor and shorten its service life.
According to Taiwan's standard operating specifications for air-conditioning projects, it is recommended that professional technicians with a refrigeration and air-conditioning decoration technician license perform "full machine high-pressure water washing and evaporator deep sterilization" every 1 to 2 years for detached air-conditioning indoor units. Especially in the humid summer in the Shuangbei Basin, the air drum and water collection tray are easy to breed black mold and jelly-like biofilm. This is also the main reason for the sour smell in the air-conditioning outlet and the backflow of the drainage pipe. Regular maintenance can maintain CSPF (Air Conditioning Seasonal Performance Factor) level one energy efficiency level, which can save an average household 15% to 20% of air conditioning electricity bills every year.
Autonomous simple maintenance vs professional maintenance safety red line
- Homeowners can do by themselves: Remove and clean the nylon filter regularly every 2 to 3 weeks (rinse with clean water and dry in a cool place, do not expose it to the sun to avoid deformation and embrittlement); clean the air outlet blades of the indoor unit with a dry cloth; check whether there is any accumulation of debris within 50 cm around the outdoor unit that hinders heat dissipation.
- Professional technicians must be entrusted according to regulations: Refrigerant pressure testing and leakage repair welding, high-pressure cleaning of indoor unit air drums and aluminum fins with liquid chemicals, reset of the drainage slope of hidden cold water pipes in the ceiling, and 220V dedicated power circuit configuration and leakage circuit breaker replacement.
