September 17, 2025
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Top Reasons Your Air Conditioner Isn’t Cooling Properly

Being in Singapore’s perpetual humidity, a working air conditioning system is vital. When your unit is not providing the cool relief you’re looking for, it can be frustrating and inconvenient. If you’ve just had a technician install an aircon in your house or have been operating the same unit for years, there are a couple of common reasons why your air conditioner is not cooling as effectively as it could be. Knowing these problems will enable you to take prompt corrective measures and prevent expensive repairs.

1. Dirty or Clogged Air Filters

One of the most frequent yet underappreciated reasons for poor cooling performance is a clogged or dirty air filter. With time, dust, dirt, and contaminants can clog up the filter, limiting airflow. It compels your air conditioning system to consume more power, lowering its cooling capacity. In more serious scenarios, it can lead to ice buildup on the evaporator coils, further weakening performance.

Daily cleaning or filter replacement, as per your unit type, is necessary to have constant airflow. In Singapore’s polluted environment, it is a good practice to do monthly checks, particularly at the height of usage months of March to May.

2. Refrigerant Leaks

Refrigerant is the chemical that picks up heat from your indoor air and disperses it outdoors. If there is a leak in your system, it might lack sufficient refrigerant to cool your space properly. Low refrigerant not only lowers cooling capacity but can also lead to long-term compressor damage.

This kind of problem usually isn’t apparent to the layman’s eyes. You might require the services of professionals in aircon troubleshooting when you experience poor airflow, strange hissing sounds, or ice forming at the outdoor unit. These symptoms may be an early warning sign of a possible leak that should be addressed at once.

3. Thermostat Settings or Sensor Issues

Sometimes, the problem can be as basic as improper thermostat readings or faulty sensors. If your thermostat is in a very hot or cold spot in your house, it can provide false readings to the air conditioner. This can result in less-than-ideal cooling or make the system cycle excessively.

For digital thermostats, attempt recalibrating or resetting the unit. For older units, replacement would be helpful to ensure precise temperature measurements. In contemporary systems, improper settings on programmable systems can also hinder your aircon from cooling properly.

4. Dirty Condenser or Evaporator Coils

Outdoors, condenser coils and indoor evaporator coils are responsible for the heat exchange process. When they get coated with dust or dirt, it inhibits the system from releasing the heat. This makes your system work harder to attain the desired indoor temperature, which results in inefficient cooling and higher energy bills.

Cleaning the coils is part of standard maintenance and should not be ignored. If you install an aircon, make sure that the coil is being cleaned regularly to prevent such issues from arising early.

5. Inadequate Unit Size or Poor Installation

A frequently underappreciated cause for cooling issues is having an aircon unit that’s either too small or too big for your room. A too-small unit will not be able to achieve the desired temperature, while a too-large unit will cycle excessively without fully dehumidifying the air.

Inadequate installation is also responsible for flow issues, coolant inefficiency, or water leaks. If your system has never performed correctly since the initial installation, perhaps it is time to re-examine the quality of the installation. Expert aircon troubleshooting services can identify if the source of the problem is equipment sizing or improper fitting.

When To Call A Professional

While basic filter checks and thermostat adjustments are easy to manage, many air conditioning problems require skilled expertise. If you install an aircon and make some simple fixes, and your aircon still isn’t cooling well, it’s time to bring in professionals for proper aircon troubleshooting. Ignoring persistent cooling issues could lead to more serious damage, including motor burnout or refrigerant system failure.

Conclusion

Your air conditioner is your front line against Singapore’s hot weather, so ensuring it is in excellent condition is essential. Whatever the problem—whether in maintenance, improper settings, or more technical issues—being proactive can conserve time, money, and comfort. If your system is still underperforming after simple checks, do not hesitate to call an expert.

Having issues with cooling? Call Airple now and receive dependable advice and professional service that makes your aircon run smoothly throughout the year.

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