Aircon Gas Top-Up Singapore: R22, R410A, R32 Explained (2026)

"Your aircon needs gas top-up" is one of the most common phrases used by aircon shops in Singapore — and one of the most common scams. Refrigerant doesn't "run out". If your unit needs top-up, it has a leak. Here's everything an honest aircon person would tell you.

The three refrigerants you'll encounter in Singapore

• R22 — older systems (pre-2015). Phased out globally for ozone depletion. Still legal to top up existing systems but $$$ — expect $120+ per top-up due to limited supply.
• R410A — common 2010–2020 installs. Higher pressure system. Still widely available. ~$80–$120 per top-up.
• R32 — current standard, used in nearly all 2018+ installs. Most efficient, lowest global warming impact. ~$60–$100 per top-up.

You can find your refrigerant type printed on the silver sticker of the outdoor (compressor) unit — look for "REFRIGERANT TYPE: R32".

Why your aircon "needs gas" — almost always a leak

Refrigerant is in a closed loop — it doesn't burn off or evaporate during normal use. If your unit's cooling power has dropped over months/years, you have a leak somewhere. Common leak points:

• Flare nuts at the outdoor unit (loose or worn)
• Schrader valve cores (the "tire valve" tops)
• Pipe insulation joins where copper pipes meet
• Micro-holes in copper pipes (rare, usually after 10+ years)
• Coil corrosion (more common near coastal areas)

Why "just top up" is throwing money away

If you top up without fixing the leak, the gas will leak out again — usually within 2–6 months. You'll be back at the same shop paying another $100. Always pressure-test first. An honest technician will:

1. Pressure-test the system with nitrogen ($30–$60 service call)
2. Identify the leak location
3. Repair the leak if possible (often free if it's a flare nut)
4. Vacuum the system to remove air/moisture
5. Charge fresh refrigerant

Yes, this takes 90 minutes and costs more upfront. But it's a one-time fix instead of a recurring scam.

Signs you might actually need a top-up (not just servicing)

• Ice forming on the indoor coil after running 20+ minutes
• Outdoor unit's copper pipes have frost on them
• Cooling drops noticeably during the hottest part of the day
• Unit cools the first 10 minutes but loses power after

Signs it's NOT a gas issue (don't let anyone upsell you)

• Musty smell — it's mould, you need a wash, not gas
• Weak airflow — it's a dirty filter or failing fan, not gas
• Aircon completely off / not turning on — it's electrical, not gas
• Water dripping — it's drainage, not gas

A real technician will check filters, coils, and electrical FIRST before suggesting gas top-up. If their first words are "need top up" — get a second opinion.