Singapore’s tropical climate means that air conditioning is a necessity in HDB flats, condos, and landed homes. Therefore, when your aircon not cold, it’s not just annoying – it affects your sleep, work, and overall lifestyle.
If you searched for:
Why Is My Aircon Running But Not Cold?
If your aircon is on but not cold, the problem can be attributed to one or more of the following:
- Aircon airflow obstruction
- Refrigerant (gas) issue Aircon gas topup
- Internal aircon parts are dirty
- Electricity or thermostat problem
- Old or faulty aircon system
Knowing the reason will save you from unnecessary aircon repair.
1. Dirty Air Filter (Most Common Problem in Singapore)
Why It Happens
The dusty Singapore environment and frequent aircon usage contribute to clogged air filters.
When this happens:
- Aircon airflow is reduced
- Cooling performance is reduced
- Evaporator coil freezes
- Electricity bill surges
This is the #1 cause of “aircon not cold” problems.
Easy DIY Fix
- Turn off aircon
- Open front panel
- Remove filter
- Wash with water
- Dry completely before reinstalling
Prevention Tip
Clean filters every 2–4 weeks.
2. Low Refrigerant Gas (Gas Leak Issue)
Signs of Low Gas
- Aircon blowing warm air
- Ice on copper pipes
- Hissing sound
- Cooling takes too long
Singapore homes often use systems from:
- Daikin
- Mitsubishi Electric
- Panasonic
- Midea
Low gas usually means there is a leak. Gas does NOT finish naturally.
Important
Never top up gas without leak repair. It’s a temporary solution.
Professional aircon technicians will:
- Detect leak
- Repair piping
- Vacuum system
- Refill refrigerant
3. Dirty Evaporator Coil
The evaporator coil absorbs heat from indoor air.
When It’s Dirty
- Air becomes less cold
- Ice forms
- Bad smell develops
Solution
A professional aircon chemical wash in Singapore is recommended for heavily clogged coils.
Chemical cleaning restores cooling performance.
4. Dirty Outdoor Condenser Unit
The outdoor unit releases heat outside.
If It’s Blocked
- Heat cannot escape
- Compressor overheats
- Cooling becomes weak
Fix
- Remove debris
- Verify adequate ventilation
- Annual maintenance
5. Thermostat or Remote Setting Error
It may be a simple problem.
Check These:
- Mode is set to “Fan” instead of “Cool”
- Temperature is too high
- Remote control battery is low
- Set temperature to 22°C – 24°C for better cooling.
6. Faulty Compressor (Serious Problem)
The compressor is the backbone of your aircon.
Symptoms
- Outdoor unit is working but no cooling
- Clicking sound is loud
- Circuit breaker keeps tripping
- Replacing the compressor can be expensive, especially for older aircons.
7. Clogged Drain Pipe
- High humidity in Singapore causes excessive condensation.
- When drain pipes get clogged:
- Water leakage
- Odor of mold
- Poor cooling performance
- Professional drain pipe flushing will resolve the issue.
8. Incorrect BTU Size for Room
If your aircon is too small for the room:
- Room is never properly cooled
- Aircon works non-stop
- Electricity bill rises
- Proper aircon sizing is essential for HDB bedrooms, living rooms, and condos.
9. Aging Aircon System (8–12 Years Old)
If your aircon is more than 10 years old:
- Energy efficiency declines
- Gas leakage becomes more common
- Components deteriorate
- Upgrade to inverter aircons for better energy efficiency.
When to Contact Aircon Repair in Singapore?
Contact a professional immediately if:
- Ice builds up constantly
- Burning odor
- Heavy water leakage
- Cooling stops suddenly
- Unusual loud noise
Aircon Servicing Cost in Singapore (2026 Estimate)
| Service | Estimated Price (SGD) |
|---|---|
| General servicing | $40 – $60 per unit |
| Chemical wash | $80 – $150 |
| Gas top-up | $80 – $200 |
| Leak repair | $150 – $400 |
| Compressor replacement | $600+ |
How to Prevent Aircon Not Cold Issues
Monthly
Air filter cleaning
Every 3-4 Months
General servicing
Yearly
Chemical wash (if needed)
Preventive maintenance prevents breakdowns by up to 70%.
Frequently Asked Questions (FAQ)
Why is my aircon not cold but fan is working?
Most probable causes:
- Dirty air filter
- Low gas level
- Dirty condenser coil
How long should an aircon last in Singapore?
8-12 years with regular maintenance.
Is aircon gas top-up required annually?
No. Gas does not degrade unless there is a leak.
Why is my aircon cold at night but not during day?
Outdoor temperature is higher during the day.