Aircon is not cooling properly
When your air conditioner is running, but the room still feels warm, it’s more than just discomfort—it’s a sign that something isn’t right. In Singapore’s hot and humid climate, an aircon that doesn’t cool properly can quickly affect sleep quality, productivity, and even health.
Below are the most common reasons why your aircon is not cooling effectively, explained in simple terms, along with what you should do next.
1. Dirty Air Filters Blocking Airflow
One of the most common and overlooked causes is clogged air filters. Over time, dust, dirt, and airborne particles build up on the filter, restricting airflow.
What happens:
- Cool air cannot circulate properly
- Cooling becomes weak and uneven
- Aircon works harder, increasing electricity bills
Solution:
Clean your air filters every 2–4 weeks. If they are heavily clogged, professional servicing is recommended.
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Low Refrigerant (Gas) Level
Aircon gas does not get “used up” normally. If the gas level is low, it usually means there is a leak in the system.
Signs of low gas:
- Aircon blows air, but not cold
- Ice forming on the indoor unit pipes
- The unit takes a very long to cool
Solution:
A technician must inspect for leaks, repair them, and then perform a proper gas top-up. Simply refilling gas without fixing leaks is not a long-term solution.
3. Dirty Evaporator or Condenser Coils
Even if filters are clean, internal coils can accumulate dirt over time. This reduces heat absorption and cooling efficiency.
Effects:
- Weak cooling
- Higher energy consumption
- Longer running time
Solution:
Chemical wash or chemical overhaul may be required, depending on the condition of the coils.
4. Faulty Thermostat Settings or Sensor Issues
Sometimes the issue is not mechanical but incorrect temperature sensing.
Common problems:
- Thermostat set too high
- Sensor misaligned or faulty
- Aircon stops cooling too early
Solution:
Check settings first. If the problem persists, a technician should inspect the thermostat and sensor positioning.
5. Compressor Problems
The compressor is the heart of your aircon system. If it fails or weakens, cooling performance drops significantly.
Warning signs:
- Outdoor unit not running
- Loud or unusual noises
- Aircon turns on but doesn’t cool
Solution:
Compressor issues require professional diagnosis. Early repair may prevent full replacement, which is costly.
6. Water Leakage Affecting Cooling Performance
A blocked drainage pipe can cause water to back up into the system, affecting cooling efficiency.
Symptoms:
- Water dripping from the indoor unit
- Reduced cooling
- Musty smell
Solution:
Drainage pipe flushing and proper servicing will restore normal operation.
7. Incorrect Aircon Size for the Room
An undersized air conditioner struggles to cool larger spaces, no matter how long it runs.
Result:
- The room never reaches the desired temperature
- Constant operation
- High electricity bills
Solution:
A proper site assessment ensures the correct BTU capacity for your room size.
8. Poor Installation or Aging System
Improper piping, insulation issues, or an old aircon system can severely affect cooling.
Common installation issues:
- Gas leaks from joints
- Poor insulation on copper pipes
- Incorrect piping layout
Solution:
Professional inspection is required. Replacing the system may be more cost-effective.
Refer: Aircon installation
When Should You Call a Professional?
If your aircon:
- Is not cold even after cleaning the filters
- Shows signs of leakage or icing
- Has weak airflow or strange noises
It’s time for professional aircon servicing. Early diagnosis prevents bigger repairs and keeps your system running efficiently.
Final Thoughts
An air conditioner that isn’t cooling properly is usually giving you early warning signs. Ignoring them can lead to higher Aircon repair costs and system breakdowns. Regular maintenance, timely servicing, and proper installation are the keys to long-lasting cooling performance.
If your aircon is not cooling as it should, don’t wait—get it checked early and stay comfortably cool ❄️
