Is a gas top-up alone worth doing?

Only as a stop-gap. If there's an active leak, the gas will run low again, so most contractors recommend finding and sealing the leak first.

How do contractors find the leak?

Common methods are a nitrogen pressure test with soap solution, an electronic leak detector, or checking flare joints and coil for oil stains that indicate where gas is escaping.

Can this be done on any brand of aircon?

Yes, gas leak repair applies across brands and both residential split units and larger commercial systems, though older R22 units may face gas availability issues.

Aircon gas leak repair and refrigerant top-up

An aircon that blows warm air, hisses near the pipes, or has ice forming on the outdoor unit often points to a refrigerant gas leak rather than a simple fault. This is a distinct job from general repair: the contractor has to pressure-test the line, find the leak point (often at flare joints or the evaporator coil), seal or replace the damaged section, then vacuum the line before recharging with the correct refrigerant type (R32, R410A or older R22 stock).

Because this involves handling pressurised refrigerant and gas that is chargeable by the kilo, buyers usually want a contractor who explains the leak location before quoting, rather than one who just tops up gas as a temporary fix that will run out again in a few months.

Common signs: weak cooling, hissing sound, ice on outdoor unit or pipes, rising electricity bill
Job includes: leak detection, pipe or joint repair, nitrogen/vacuum test, gas recharge
Relevant for both split units and multi-split (aircon casette/ducted) systems

What it costs

Pricing depends on refrigerant type (R32 and R410A generally cost more per kg than older R22), how much gas the unit needs, and whether the leak point is easy to reach or buried in wall trunking. A simple top-up without leak repair is cheaper but usually a short-term fix, so many contractors quote leak detection and gas together.

Top 3 by our score

Ranked from our published scoring of public Google reviews for aircon repair.

1. BioHydro (M) Sdn Bhd - Aircond Service (Chemical free)
5.0★ · 413 reviews

94
2. Jaya Maju Aircond Electrical & Plumbing Services
5.0★ · 1152 reviews

94
3. Aircon Anda
5.0★ · 207 reviews

94

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FAQ

Is a gas top-up alone worth doing?: Only as a stop-gap. If there's an active leak, the gas will run low again, so most contractors recommend finding and sealing the leak first.
How do contractors find the leak?: Common methods are a nitrogen pressure test with soap solution, an electronic leak detector, or checking flare joints and coil for oil stains that indicate where gas is escaping.
Can this be done on any brand of aircon?: Yes, gas leak repair applies across brands and both residential split units and larger commercial systems, though older R22 units may face gas availability issues.

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