Aircon Can’t Reach Your Set Temperature?

In Singapore’s climate, cooling performance isn’t just about comfort — it’s about control. When your aircon runs for hours but still can’t hit the temperature you’ve set, it’s not “normal.” It’s a sign the system isn’t performing at full capacity.

What’s Stopping Your Aircon from Reaching the Right Temperature?

1. Thermostat settings are wrong

Always check first: is it on “cool” mode? Is the temperature set correctly? Even a small misstep here can throw the system off.

2. Filters are blocked

Dirty filters restrict airflow. If the air can’t circulate properly, cooling drops — and the unit runs longer without hitting the target.

3. Unit is too small for the room

If the system’s BTU rating doesn’t match the space, it may never be able to cool the area — especially in open layouts or sun-exposed rooms.

4. Refrigerant is low

Cooling depends on gas. If levels drop due to a leak, your system might run endlessly without ever reaching the set temperature.

5. Compressor is weak or faulty

A compressor in decline won’t circulate refrigerant properly. That weakens the entire cooling cycle — especially in older systems.

6. Vents or ducts are blocked or leaking

Obstructions (like curtains or furniture) can block airflow. In ducted systems, leaks or damage in the ductwork can waste cold air before it reaches the room.

7. Indoor coil is dirty

If the evaporator coil is coated with dust, it can’t absorb heat efficiently. The system ends up working harder for weaker results.

8. Too much direct sunlight

If the room is exposed to strong afternoon sun, the load on your system spikes. Cooling may struggle to catch up, even if the aircon is technically working.

9. Poor insulation

Hot air coming in — or cool air leaking out — means your aircon is fighting against constant heat gain. That can stall cooling progress.

What You Can Check First

• Thermostat mode and temp setting

• Filters clean?

• Vents open and unobstructed?

• Any signs of cold air, or just airflow?

If the basics are in place and it’s still not cooling — a deeper system check is likely needed.

Why It Matters

When a unit runs but never achieves target cooling:

• Energy bills go up

• System wears down faster

• Comfort drops — especially at night or during peak sun

It’s not a small inefficiency. It’s a fault waiting to escalate.

When to Book a Diagnostic

✅ Cooling is weak even after hours of use

✅ Temperature never hits set point

✅ Filters are clean, but airflow feels weak

✅ Outdoor unit runs strangely or is silent

We’ll assess the system end-to-end and advise what’s causing the cooling shortfall.