Why my Aircon is not cooling

There Are Many Reasons Why Your AC Is Not Cooling Properly

In Singapore’s hot and humid climate, an air conditioner that is not cooling properly can be very uncomfortable. Many homeowners and office users experience this problem, especially when the aircon is used daily. If your AC is running but the room still feels warm, it is a sign that something is wrong. Understanding the causes early can help prevent costly repairs and complete breakdowns.

Below are the most common reasons why your AC is not cooling properly.

1. Dirty Air Filters

Air filters collect dust and dirt over time. When they become clogged, airflow is reduced, causing weak or warm air.

What to do:
Clean your air filters every 2–4 weeks. Regular aircon servicing helps maintain proper airflow and cooling performance.

2. Low Refrigerant Gas

Refrigerant gas is essential for cooling. If the gas level is low due to leakage, the AC will blow air but not cold air.

Signs:

• Aircon not cold

• Ice forming on pipes

• Longer cooling time

Solution:
Call a professional technician to check for gas leaks and refill the refrigerant safely.

3. Dirty Fan Coil Unit

In Singapore’s humid environment, dust, bacteria, and mold can build up inside the fan coil unit, affecting cooling efficiency.

Solution:
A chemical wash or chemical overhaul may be required to restore proper cooling.

4. Faulty Thermostat or Wrong Settings

Sometimes the AC is not cooling due to incorrect temperature settings or a faulty thermostat sensor.

Tip:
Ensure the AC is set to Cool Mode and the temperature is between 23–25°C.

5. Blocked Outdoor Condenser Unit

The outdoor unit releases heat. If it is dirty or blocked, the AC cannot cool efficiently.

Solution:
Keep the outdoor unit clean and ensure proper ventilation around it.

6. Wrong AC Capacity for Room Size

Using an AC with insufficient cooling capacity (BTU) for the room size is a common issue in Singapore homes.

Result:
The AC runs continuously but never cools the room properly.

7. Poor or Irregular Maintenance

Lack of regular servicing leads to dust buildup, gas issues, and worn-out components.

Recommendation:
Schedule aircon servicing every 3–6 months to maintain performance and efficiency.

When Should You Call a Professional?

You should contact an aircon technician if:

• The AC is running but not cooling

• There is water leaking or ice buildup

• Cooling performance keeps getting worse

• Electricity bills suddenly increase

Final Thoughts

There are many reasons why your AC is not cooling properly, especially in Singapore’s climate. Regular maintenance, correct usage, and timely professional servicing can help keep your aircon running efficiently and extend its lifespan.

If your AC is not cooling, do not ignore the problem—early action saves money and prevents major breakdowns.