AC Gas Top-Up Cost Brisbane (2026) — From $180
Installer’s price guide for refrigerant top-ups in Brisbane — when a top-up makes sense versus a full regas, what’s included, and the questions to ask your installer.
Quick answer: Gas top-up from $180 inc GST for a standard split system needing a small refrigerant boost. Includes a leak check first — we don’t add gas to a leaking system without telling you. Full regas (from $250) is usually the better option if the system is significantly low.
Brisbane top-up pricing (2026)
| System type | Starting from (inc GST) | Includes |
|---|---|---|
| Split system (2.5–6kW) | From $180 | Leak check, top-up to spec, pressure verify |
| Split system (7kW+) | From $220 | As above, larger top-up volume |
| Multi-head | From $260 | Whole multi-head circuit |
| Ducted | From $290 | Single charge point, full pressure check |
| Commercial | Quote on site | Scope depends on system size |
Includes electronic leak check, refrigerant supply (R32 or R410A), pressure-balanced top-up, and run-test. If significant leak detected, we’ll stop and quote a leak repair rather than top up regardless. Final price depends on refrigerant volume needed.
Top-up vs full regas — which is right for you?
The decision depends on three things: how low the charge is, whether there’s an active leak, and the age of the system.
- Top-up makes sense: system slightly under-charged (10–20% low) and no active leak detected. Faster (60 min), cheaper, restores cooling.
- Full regas makes sense: system significantly under-charged (30%+ low), leak just repaired, moisture suspected in the system, or refrigerant type change needed. See AC regas from $250.
- Top-up is wrong: if there’s an active untreated leak, adding gas is pointless — it’ll be gone in 6–12 months. Fix the leak first.
Why we check for leaks before topping up
Adding refrigerant without identifying the leak is a common cowboy-installer move. Three reasons we never do it:
- You’ll be back. A leaking system loses the top-up in weeks to months. You’ve paid for a service that didn’t fix the problem.
- Environmental impact. Refrigerants have global warming potential 600–2,000× CO₂. Adding gas to a system that vents it to atmosphere is environmentally awful.
- Long-term damage. Continued operation on chronically low refrigerant overheats the compressor. Each undiagnosed leak/top-up cycle takes years off the unit’s life.
A 5-minute electronic leak scan at the start of every top-up visit catches active leaks. If we find one, we’ll stop and give you a quote for the leak repair rather than waste your money.
When a top-up is enough
Top-ups are legitimately appropriate in a few scenarios:
- Slow permeation. All sealed systems lose ~1% of refrigerant per year through pipe wall permeation. After 10+ years a system may be 10–15% low without an active leak.
- Service-related loss. A previous service that wasn’t done perfectly (gauges connected and disconnected with brief venting) can lose 5–10% of charge.
- Long pipe runs. Initial install with longer-than-spec pipe run was undercharged from day 1. Top-up brings the system back to manufacturer spec.
- System age compensation. Older R22 systems sometimes benefit from a small top-up before retrofit to R410A.
What happens on a top-up visit
- Inspection. Visual check of outdoor unit, refrigerant pipes, indoor unit. Note any visible oil residue or damage.
- Electronic leak scan. 5 minutes with electronic sniffer at all common leak points.
- Pressure measurement. Gauges connected at the service valves. Read suction and discharge pressures, compare to manufacturer spec.
- Charge calculation. Calculate weight of refrigerant needed to bring the system to spec, based on capacity and current pressure.
- Top-up. Refrigerant added in measured weight (digital scale on the cylinder), not by eye.
- Run-test. System restarted, superheat and subcool verified on the gauges. Indoor supply-air temp measured to confirm cooling output.
- Report. Written record of pressures before/after, refrigerant added, any flagged issues.
Common questions
How much does an AC gas top-up cost in Brisbane?
From $180 inc GST for a standard split system. From $220 for larger splits (7kW+). From $260 multi-head. From $290 ducted. Includes leak check, top-up, and pressure verification.
How often should I need a top-up?
Rarely. Sealed AC systems should not lose meaningful refrigerant. Permeation losses are ~1% per year — after 10 years that’s 10% off, which might warrant a top-up. Anything more is a leak.
What’s the difference between a top-up and a regas?
Top-up adds refrigerant to bring charge up to spec — faster, cheaper. Regas recovers all existing refrigerant, vacuums the system, and refills from empty — more thorough, takes longer, costs more. Top-up suits slightly-low systems; regas suits empty systems or systems needing a fresh start.
Will you top up if there’s a leak?
Not without flagging it first. If the leak scan shows active leakage, we’ll stop and recommend leak repair (from $300) before any top-up. Adding gas to a leaking system is wasteful and damaging.
How long does a top-up take?
60 minutes on site — including leak scan, pressure measurement, charge calculation, top-up, and run-test.
Is a top-up covered under warranty?
No — refrigerant loss is treated as a maintenance item, not a manufacturing defect. The underlying leak might be covered if it’s a workmanship issue from the original install.
Do I need an ARC licence to top up refrigerant?
Yes — refrigerant handling in Australia requires an ARCtick licence. Unlicensed handling carries fines up to $93,900 for individuals. AH Aircon is ARCtick licensed (AU54321).
AH Air Conditioning · 63 Britannia Ave, Morningside QLD 4170 · ARCtick AU54321 · 20+ years across Brisbane.