How Often Should You Do an Aircon Gas Top Up in Singapore?

A widespread myth among homeowners in Singapore is that aircon gas is consumed like fuel in a motor car and needs constant refilling. This is false.

An air conditioner operates on a closed-loop system. Under ideal conditions, refrigerant gas should last for many years without needing a top-up.

So why do some aircons require a gas top-up?

Why Aircon Gas Levels Drop

If your aircon loses refrigerant pressure, it means there is a leak in the system. Leaks commonly occur due to:

• Corroded or aged copper joints
• Imperfect flare nut connections
• Microscopic pinholes in evaporator coil tubing
• Physical damage during pipe installation

Common Gas Types Used in Singapore

1. R32 Refrigerant: Modern, highly eco-friendly gas with superior cooling efficiency.
2. R410A Refrigerant: Commonly found in inverter aircons installed over the past decade.
3. R22 Refrigerant: Older gas type found in legacy non-inverter systems (being phased out globally).

Signs You Need a Gas Top Up

• Aircon takes a very long time to cool the room
• Outdoor compressor copper valves show frost or ice buildup
• Hissing or bubbling noises near the copper line casing
• Airflow temperature is not cold even after cleaning filters

Recommendation

During routine general servicing, technicians measure pressure levels using a manifold gauge. If minor loss is detected, a quick top-up restores peak cooling. However, if gas drains rapidly within weeks, request a pressure test to locate and seal copper line leaks.