When Should You Top Up Aircon Gas? Signs to Look Out For in Singapore

If your aircon is running but not cooling well, it could be low on gas. In Singapore, this is a common issue due to daily usage and high humidity. But how do you know when it’s time to top up your aircon gas? Here’s what to look out for—and what to do next.

A technician connects a refrigerant tank to a condenser unit during an aircon gas top-up procedure

What Is Aircon Gas and Why Does It Matter?

Aircon gas (also called refrigerant) is what makes your aircon cool the room. It flows through the coils and helps transfer heat from inside your home to the outside.

Singapore homes commonly use R32 or R410A refrigerants. These don’t run out unless there’s a leak or system problem. So if your aircon needs gas, it likely means there’s an underlying issue.

Signs Your Aircon Gas Is Low

Here are the most common low refrigerant symptoms to look for:

• Air not cold despite running normally

• Weak airflow

• Ice forming on the indoor unit

• High energy bills for the same usage

• Water leakage or dripping from the unit

• Unusual hissing or bubbling noises

If you notice any of these, it’s time to check the gas level.

"A gauge meter displaying low pressure, indicating the need for an aircon gas top-up

What Causes Aircon Gas to Run Low?

• Leaks in the copper piping

• Poor installation or loose fittings

• Old or worn components

• Corrosion from Singapore’s humid climate

Topping up the gas without fixing the leak is only a temporary solution. A good technician should always test for leakage first.

How Often Should You Top Up Aircon Gas?

In a properly maintained system, you should not need to top up gas often. It’s not part of regular servicing unless there’s a problem.

If your unit needs gas more than once a year, it likely has a leak.

Types of Gas Used in Singapore

Gas Type	Common In	Features
R32	Most newer systems	Lower global warming potential, efficient
R410A	Older systems	Phasing out, still widely used

Always use the correct type of gas based on your aircon model.

What Happens During a Gas Top-Up?

A licensed technician will:

1. Check pressure with a gauge meter

2. Identify and repair leaks if any

3. Connect a refrigerant tank (e.g., R32 gas refill)

4. Add the correct amount based on your system’s specs

5. Test cooling performance and airflow

Why You Shouldn’t DIY

Topping up gas is not a DIY task. Handling refrigerants requires proper training and equipment. Doing it yourself can damage your system—or cause injury.

FAQ

Q1: How much does it cost to top up aircon gas in Singapore?

Prices range from $50–$150, depending on the gas type and amount needed.

Q2: How long does a gas top-up take?

Typically 30–45 minutes per unit.

Q3: Can I use R32 if my unit uses R410A?

No. Each aircon model supports specific refrigerants. Mixing or switching gas types can damage the system.

Q4: Do I need to top up gas during every service?

No. It’s only needed if your aircon has performance issues or low pressure.

Q5: What happens if I ignore low gas levels?

Your aircon may stop cooling, overwork the compressor, and lead to costly repairs.

Suspect your aircon needs a gas refill? Contact Sky Blue Aircon Engineering Pte Ltd for fast diagnosis and proper top-up using R32 or R410A refrigerants.