Do You Really Need to Top Up Your Aircon Gas? Here’s How to Tell

Why Aircon Gas Top-Up Matters in Singapore

Topping up your aircon gas isn’t something you need to do regularly like a servicing schedule. But if your unit isn’t cooling well, it might be one of the first things a technician checks. Refrigerant gas (commonly R32 or R410A in Singapore) is essential for your aircon to function. If levels drop, your aircon may blow warm air, run inefficiently, or even freeze over.

Visual guide to help Singapore homeowners identify signs of low aircon gas and understand the difference between R32 and R410A refrigerants

Signs Your Aircon Might Need a Gas Top-Up

1. Air Isn’t Cold Enough

You set the temperature to 22°C, but the room still feels like 30°C. This is the most common complaint from customers needing a gas top-up.

2. Ice Forming on Pipes or Unit

Ice on the evaporator coil or outdoor unit usually signals low refrigerant. It’s a warning sign that your system is overworking.

3. Longer Cooling Time

If your aircon used to cool the room in 10 minutes but now takes 30, it may be low on gas.

4. Hissing or Bubbling Sounds

Unusual sounds can indicate a refrigerant leak. Don’t ignore them — get a check.

What Causes Refrigerant Loss?

Unlike car petrol, aircon refrigerant doesn't get “used up” during operation. So why would it go low?

• Leaks from connectors or valves

• Improper installation

• Wear and tear over time

A proper technician should detect and repair the leak before topping up.

R32 vs R410A — What’s the Difference?

In Singapore, most new aircon units use R32, while older systems may still use R410A.

Feature	R32	R410A
Efficiency	Higher	Lower
Environmental Impact	Lower GWP	Higher GWP
Availability	Widely used in new units	Slowly being phased out
Cost	Slightly cheaper	Slightly more expensive

Check your aircon label or manual to confirm which type your system uses.

How Often Do You Need to Top Up Aircon Gas?

You shouldn’t need a gas top-up unless there’s a leak. If a company recommends it during every regular servicing, ask for proof (like low pressure readings).

At Sky Blue Aircon Engineering Pte Ltd, our technicians perform pressure checks and explain the findings before recommending a top-up.

What to Expect During a Gas Top-Up

• Technician will check pressure readings

• Identify and fix leaks if present

• Use correct gas (R32 or R410A)

• Fill to the recommended level, not more

Final Thoughts

Gas top-ups are not routine — they should only happen when needed. If your aircon isn't cold or you notice odd symptoms, call a professional to inspect it properly.

Need help? Contact Sky Blue Aircon Engineering Pte Ltd for a pressure check and honest advice.