Air Conditioning Regassing Cost NSW 2026 - Get Free Quotes

Air Conditioning Regassing Costs in NSW for 2026

Air conditioning systems need a specific quantity of refrigerant to work. When refrigerant levels fall below design specifications, cooling performance diminishes noticeably. Unlike fuel that gets consumed, refrigerant circulates continuously in sealed systems, meaning low levels indicate a leak somewhere in the circuit. Professional regassing addresses both the immediate symptom and underlying cause. Basic regassing for modern systems using R32 or R410A refrigerant costs $200 to $350 across NSW during 2026, including refrigerant and labour. Older systems using phased-out R22 refrigerant face higher costs of $350 to $600, because supply of this legacy gas keeps getting scarcer. Simply recharging without addressing leaks provides only temporary improvement.

Complete regassing service including leak detection, repair and recharging costs $400 to $700 for typical residential split systems. That approach deals with both the symptom and the cause, which is what makes the cooling stay restored. Ducted systems carry higher charges reflecting far more refrigerant and leaks that can be harder to reach. Regional NSW pricing follows a predictable pattern, with Sydney at the top while Newcastle, Wollongong and regional centres come in 10 to 15 per cent below on equivalent work. Ask for the refrigerant type and the weighed quantity on the invoice.

The broader air conditioning cost guide covers service and repair costs across NSW. Comparing a regas figure against those numbers is worth doing before you commit, because a system needing gas regularly is often a system approaching a bigger decision. The cost of the gas is rarely the whole picture. A system that has never leaked will not need gas. The invoice should name the refrigerant type and the weighed quantity, since the next technician who attends will need both. It takes a moment to ask.

Understanding Refrigerant and System Operation

Refrigerant absorbs heat from indoor air and releases it outdoors, which is how the system cools your home. This process depends on precise refrigerant quantities maintaining correct pressures throughout the system. Low refrigerant reduces heat absorption capacity, diminishing cooling output even while the system runs continuously. Confirm it before the work starts rather than after. Detection costs less than a second regas.

Sealed refrigerant circuits should maintain charge indefinitely under normal operation. Any drop means refrigerant is escaping through a leak, whether through failed joints, corroded components or physical damage. Simply adding refrigerant without addressing the leak is temporary, since the level will fall again. Get the ARC licence number before work starts. Autumn and early spring are the value windows, because technicians have capacity and nothing is urgent. Worth confirming at booking.

System pressure measurements during diagnosis indicate refrigerant status. Low pressures suggest refrigerant loss requiring investigation. Technicians compare readings against manufacturer specifications to tell whether the system is running within range or needs work. Ask the technician to talk you through what they found. Weighing the charge is the only accurate method.

Why a Sealed System Loses Gas at All

The single most useful thing to understand about regassing is that a working air conditioner should never need it. Refrigerant is not consumed the way fuel or oil is, it circulates in a sealed loop indefinitely, and the system was charged once at installation with a weighed amount calculated for that unit and its pipe length. If the charge is low, refrigerant has escaped somewhere, and that somewhere is a leak. Evacuation is the step most often skipped. A system that has held its charge for a decade has no reason to need gas this year. That answer is informative on its own.

That reframes the whole transaction. A regas is not a service item like an oil change or a filter clean, it is a repair to a fault, and quoting it as routine maintenance is either a misunderstanding or a sales tactic. Any technician who tells you a system needs topping up every couple of years as normal upkeep is describing a leak they have chosen not to find. That detail belongs on the invoice. Keep the invoice with the system paperwork.

Leaks develop for predictable reasons and most are mechanical rather than mysterious. Vibration from the compressor gradually works flare fittings loose, particularly on installations where the joints were not torqued correctly at the start. Salt air corrodes copper and aluminium on coastal properties, and Sydney's eastern suburbs, the northern beaches and the Central Coast see meaningfully more corrosion related leaks than inland areas. Autumn booking is cheaper than January. Leak detection adds $150 to $400 and saves paying for the same regas again next summer. Most operators explain it readily.

Installation quality determines a great deal of this and it shows up years later. Flare joints made without the right tool, pipework that was kinked during installation and then straightened, brazed joints on an older system that were not purged properly, and pipe runs that vibrate against a bracket all become leaks eventually. A system that starts losing gas within three or four years usually points back to how it went in. It is a reasonable question and a straight answer is a good sign. Ask what the gas alone comes to on a ducted system.

Age is a genuine factor beyond installation quality. Coil corrosion, degraded seals around the compressor and service valve wear all accumulate, and a fifteen year old system losing refrigerant is telling you something different to a five year old one. That difference matters when you are deciding whether to repair it, and unit replacement is priced at air conditioning replacement. A leak found is a leak that can be priced. Bundling a regas with a due service costs far less than two separate bookings. Keep the paperwork together.

Why Topping Up Without Repair Wastes Money

The cheapest quote you will get is a straight regas with no leak work, and it is almost always the most expensive option in the end. Putting gas into a leaking system means paying $200 to $350 for refrigerant that will escape at the same rate it did before, so a system that lost its charge over eighteen months will lose the new charge over the same period. All you have bought is one more summer. Worth clarifying while the quote is still open. On a ducted system the gas itself can be most of the invoice rather than the labour.

Run the numbers over a few years and the picture is clear. Three regas visits over five years at $280 each is $840 spent on gas that has all leaked out, against a single leak detection and repair at $300 to $600 plus one proper regas, which fixes the underlying problem and stops the cycle. The repair route usually costs less within two years and always costs less within three.

There is an environmental and legal dimension as well. Refrigerants are controlled substances, deliberately releasing them is an offence, and knowingly recharging a leaking system without attempting repair sits poorly against the obligations technicians work under. The framework covering refrigerant handling and environmental protection is administered through the NSW EPA. Get it in writing where the amounts are significant.

Undercharging causes damage beyond poor cooling, which is the part homeowners rarely hear about. A system running low on refrigerant returns liquid to the compressor rather than vapour, and it also loses the cooling effect that the refrigerant provides to the compressor motor itself. Running a system in that condition through a hot summer is how a $300 leak turns into a compressor failure costing thousands.

The right question to ask a technician is not what a regas costs but what they will do to find the leak. A quote that includes detection, a repair figure and a regas is a repair quote. A quote that is only a regas figure is somebody selling you a temporary fix, and it is worth asking why detection was not included. Servicing scope is covered at air conditioning servicing.

Refrigerant Types and Costs

R32 is the current standard refrigerant for residential air conditioning, offering improved efficiency and lower environmental impact than predecessors. Systems manufactured from approximately 2018 onward predominantly use R32. Regassing costs for R32 systems run $200 to $350 for typical residential units. Most operators will explain it without being pushed.

R410A served as the standard refrigerant from approximately 2010 to 2018, replacing earlier R22 in new installations. Many currently operating systems use R410A, with regassing costs similar to R32 at $200 to $350. This refrigerant remains readily available with stable pricing.

R22 refrigerant used in older systems faces increasing supply constraints as this ozone-depleting substance phases out globally. Remaining stocks carry premium pricing, with R22 regassing at $350 to $600 and likely to rise further. Older R22 systems facing significant repairs are usually better replaced than kept running on gas that keeps getting dearer. That is the number that should drive the decision.

Refrigerant types cannot be mixed or substituted within systems designed for specific gases. Each refrigerant operates at different pressures requiring matched components. Retrofitting an older system to a newer refrigerant is impractical on most domestic installations.

Leak Detection Methods

Electronic leak detectors sense refrigerant gases in air surrounding suspected leak points. Technicians systematically check joints, connections and component surfaces, with the detector signalling where refrigerant is escaping. It finds most accessible leaks. Ask what it means for your particular system.

UV dye testing introduces fluorescent dye into the refrigerant circuit, which escapes with leaking refrigerant and becomes visible under ultraviolet light. It works well on small or intermittent leaks not readily detected electronically. Dye remains in the system for future leak identification.

Pressure testing verifies system integrity by monitoring whether pressurised systems maintain or lose pressure over time. A rapid pressure drop means a large leak, while a slow decline points to a small one. This method confirms leak presence without necessarily pinpointing location. Knowing it in advance removes the surprise later.

Nitrogen pressurisation finds leaks in systems that are completely empty of refrigerant. Dry nitrogen at elevated pressure reveals leaks through audible hissing or bubble formation when suspect areas are sprayed with leak detection fluid. This method suits systems requiring complete recharge.

Common Leak Locations

Flare joints connecting copper pipework represent common leak points, especially where the installation was rushed. Vibration and thermal cycling stress these connections over time. Simple joint repairs cost $150 to $250 where accessible, though a joint buried in a wall or ceiling takes longer. Settle that before the technician begins.

Evaporator coils within indoor units develop leaks through corrosion, especially on the coast or in homes with certain chemicals in the air. Coil replacement is expensive at $400 to $800 for parts plus labour, which on an older unit often means replacing it instead. On an ageing unit that figure often approaches half the cost of replacing it outright. Get both priced before committing.

Condenser coils in outdoor units are exposed to the weather, and corrosion leaks follow. Coastal salt air accelerates corrosion, as does exposure to certain garden chemicals. Condenser coil repair or replacement costs much the same as evaporator work.

Service valve cores sometimes leak at the connection points used during installation and servicing. These relatively accessible components cost little to replace, though neglecting small leaks here gradually depletes refrigerant. Technicians routinely check valves during service visits. Have them explain the finding in plain terms.

Repair Options and Costs

Simple accessible leak repairs including joint tightening, valve replacement and minor pipe repairs costs $150 to $300 including materials. These straightforward fixes address common leak sources without pulling the unit apart or replacing components. These are the repairs worth doing without hesitation, since they are cheap and they last. Ask whether the leak found is one of them.

Complex repairs involving coil work, concealed pipework or pulling the unit apart cost $300 to $600 or more. The balance between repair cost and system age is what decides whether to proceed or price a replacement instead. Half the cost of a new system, on a unit past two thirds of its life, is where most owners stop spending. Ask what the technician expects the repair to hold for.

Some older systems develop multiple small leaks that are impractical to fully address. Technicians can assess overall system condition and advise whether repairing every leak is worth the spend or whether a new system is better value. Running cost is the factor people leave out of that comparison. A decade old unit uses noticeably more power than a current one doing the same work.

What a Proper Regas Actually Involves

Knowing the correct sequence lets you tell a thorough job from a quick one, and the difference is visible from the ground. A proper regas is not connecting a bottle and adding gas until the system feels cold, it is a defined procedure that takes a couple of hours and produces a system charged to the manufacturer's specification. Two hours sounds like a lot for adding gas, and it is, because recovery, testing and evacuation take up most of it.

It starts with recovery rather than addition. Whatever refrigerant remains in the system is pumped out into a recovery cylinder, both because releasing it is unlawful and because you cannot accurately charge a system that already contains an unknown quantity. A technician who skips recovery and simply adds gas is guessing at the final charge. It should appear on the paperwork.

Pressure testing follows, usually with dry nitrogen, and this is where a leak is confirmed and located. The system is pressurised and held, and a pressure drop over time confirms there is a leak even where the location is not yet obvious. Skipping this step and going straight to gas is the single most common corner cut in this trade.

Evacuation comes next and matters more than most people realise. A vacuum pump pulls the system down to remove air and moisture, because moisture inside a refrigeration circuit forms acids that attack the compressor from the inside over months and years. A proper evacuation takes time rather than minutes, and rushing it is a quiet way of shortening the life of an expensive component. Any legitimate operator answers that without hesitating.

Only then is the new charge weighed in. The correct quantity is on the unit's data plate, adjusted for pipe run length, and it is measured on scales rather than judged by gauge pressure or by how cold the air feels. Ask whether the charge will be weighed in, since the answer separates technicians who follow the procedure from those who judge the charge by how cold the air feels.

The job finishes with performance checks and paperwork. Running pressures, temperature split across the indoor coil, and current draw all get recorded, and you should be told what refrigerant was used and how much went in. Keep that record, because the next technician who attends will want it and it is evidence for any warranty discussion. Raise it before the job is booked.

R22 Systems and the Replace Decision

If your system uses R22 you are facing a different decision to everyone else, and the economics have shifted permanently. R22 was phased out under international agreement because of its ozone impact, no new stock is imported into Australia, and the only supply available is reclaimed gas recovered from decommissioned systems. Scarcity has pushed the price to several times that of current refrigerants.

That shows in the quote directly. An R22 regas runs $350 to $600 against $200 to $350 for an equivalent R32 or R410A system, and the gap widens as remaining stock depletes. A large or ducted R22 system needing a full charge can exceed a thousand dollars in gas alone, which changes the arithmetic considerably. Have the figure written down on anything sizeable.

Age compounds the problem, because any R22 system is old by definition. R22 has not been fitted to new domestic equipment in Australia for many years, so a system running it is likely fifteen years old or more, with a compressor near the end of its service life, degraded insulation and efficiency well below anything current. Spending $800 on gas for a unit that may fail next summer is rarely sound.

Retrofitting to a different refrigerant is technically possible and usually not worth it. Drop in replacements exist but generally require oil changes, component substitutions and result in reduced capacity and efficiency compared to the original design, and the labour involved approaches the cost of new equipment. Most technicians will tell you this honestly if you ask them directly. A competent technician volunteers that information.

The practical test is simple. If an R22 system needs more than a small top up, price a replacement alongside the repair, because a new inverter system will use substantially less power and comes with a warranty, and the running cost difference over ten years often exceeds the purchase price gap. New system pricing sits at split system installation and ducted air conditioning.

Repair or Replace the Whole System

There comes a point where spending on refrigerant stops making sense, and it arrives sooner than most people expect. The useful frame is not whether the repair is affordable but what it buys you, because $600 spent on a twelve year old system with a corroded coil buys perhaps two more summers, while the same money against a five year old unit buys another decade. That is the calculation worth making before you approve anything. Ask the technician how long they expect the repair to hold.

Age is the first filter. Domestic split systems generally run twelve to fifteen years with reasonable maintenance, and ducted systems similar, so a leak in year four is a repair and a leak in year thirteen is a conversation about replacement. Between those, the answer depends on where the leak is and what else the system is doing. Weigh the decision against that figure.

Leak location matters enormously to that calculation. A leaking flare fitting at the outdoor unit is accessible, cheap to repair and does not indicate anything about the rest of the system. A leaking evaporator coil inside the indoor unit means a component replacement approaching the cost of a new head, and a leaking condenser coil is similar. Ask specifically where the leak is before deciding.

Running cost is the factor people leave out. A system from a decade ago consumes meaningfully more power than a current inverter unit doing the same work, and on a household running air conditioning through a Sydney summer that difference shows on quarterly bills. Repairing an inefficient system keeps you paying that premium for as long as it survives.

The reasonable rule of thumb used across the trade is that repairs approaching half the cost of replacement, on a system past two thirds of its expected life, favour replacement. It is not a formula, but it stops the pattern of spending several hundred dollars a year on a unit that was never going to last. Repair options are covered at air conditioning repair. Have them relate it to your own unit.

Signs Your System Needs Regassing

Reduced cooling despite normal operation suggests possible refrigerant loss. Systems running continuously without achieving set temperatures may not have enough refrigerant to move heat properly. Compare current performance against historical capability to identify gradual decline.

Ice on the refrigerant lines or the indoor coil means the system is not running normally, and low refrigerant is a common cause. While dirty filters can cause similar symptoms, persistent icing after filter cleaning points to a refrigerant problem that needs a technician. Icing is also a sign to switch the system off rather than run it harder. Continuing to run an iced system can damage the compressor.

Hissing sounds near indoor or outdoor units may indicate refrigerant escaping through larger leaks. An audible leak means refrigerant is escaping much faster than a slow seepage, and they need attention quickly to limit both the loss and the release. A sudden total loss usually means a fractured pipe or a failed joint rather than gradual seepage. That is a different repair to a slow leak.

Unusually high electricity bills despite similar usage patterns may reflect the system working harder to make up for the missing refrigerant. Low refrigerant pushes running costs up and comfort down at the same time. You pay twice, once on the power bill and again in a house that never quite gets cool. Neither is obvious until you see the figures side by side.

Licensing Requirements

All refrigerant handling in Australia requires Australian Refrigeration Council licensing. That requirement exists so technicians are trained to handle controlled substances safely with environmental implications. NSW Fair Trading and SafeWork NSW oversee related requirements. Knowing the position early avoids an awkward conversation later.

Verify technician ARC licensing before engaging any regassing service. Licensed operators appear in the ARC database, verifiable online or by phone. Unlicensed refrigerant work carries real penalties, and somebody working without a licence raises questions about their competence and insurance more broadly.

Recovered refrigerant must be properly handled under environmental regulations overseen by the NSW Environment Protection Authority. Licensed technicians recover refrigerant into a cylinder rather than releasing it, which is what the regulations require. Recovery equipment is expensive, which is part of why properly licensed operators cost more than unlicensed ones. It is also the law rather than best practice. Reclaimed gas has to go somewhere, and that somewhere is a cylinder rather than the atmosphere.

Regassing Costs Across Sydney

Metropolitan pricing on refrigerant work varies less by suburb than by what the system uses and how easy the outdoor unit is to reach. Refrigerant costs the same wholesale everywhere, so a quote well above the others is usually about access, the gas type, or how busy the operator is that week. That said, coastal suburbs carry a genuine pattern worth knowing about.

Coastal properties see more refrigerant work than inland ones and the cause is corrosion rather than bad luck. Salt laden air attacks the aluminium fins and copper joints on an outdoor unit continuously, and a condenser on a beachfront property can develop pinhole leaks years before an identical unit in Penrith would. Rinsing the outdoor coil with fresh water a few times a year genuinely extends its life, and it costs nothing. A hose and five minutes at the change of each season is all it takes. Do not use a pressure washer on the fins.

Western Sydney has the opposite problem, which is load rather than corrosion. Systems out through Penrith, Blacktown and the south west run harder and for longer than coastal ones through summer, and a system that is marginally undercharged will struggle noticeably there while the same charge might pass unnoticed closer to the water. A performance complaint in western Sydney is worth taking seriously earlier. What passes as adequate in October will not pass in February.

Access is the other metropolitan variable. A condenser on a ground level pad beside the house is a straightforward job, while one on a roof, a balcony reached through the living room, or a bracket three metres up an external wall adds time and sometimes equipment. Mention where the outdoor unit sits when booking, since it affects both the price and how long the technician allows. A photograph sent with the enquiry answers it better than a description.

Ducted and Multi-Head Systems

Everything costs more on a ducted or multi-head system, and the reason is volume of refrigerant combined with the length of pipe it has to travel through. A single split holds a comparatively small charge, while a ducted system serving a whole house holds several times that, and the gas is the dominant line item on the invoice rather than the labour. That changes how you read a quote, since the refrigerant type matters more than the hourly rate. Ask what the gas alone comes to. On a large ducted system that figure can be most of the invoice.

Leak detection also takes longer on these systems because there is more to check. A single split has one pipe run and a handful of joints, while a ducted system has runs through a roof space, multiple brazed joints and sometimes a branch box, and a multi-head system has separate runs to every indoor unit. Budget for more diagnostic time rather than expecting the single split figure.

Roof space work introduces its own constraints. Summer roof cavities in Sydney reach temperatures that limit how long anyone can safely work up there, which is another argument for booking refrigerant work outside the peak of summer. It also means a technician may need to attend early morning, which is worth knowing when you arrange access.

On a multi-head system the location of a leak matters more than usual, because one leaking head takes the whole system down rather than one room. That is the trade off inherent in the configuration and it is worth understanding before diagnosis begins. Multi-head system pricing sits at multi split systems.

Commercial and larger installations follow the same principles at a different scale, with correspondingly larger refrigerant charges and stricter record keeping requirements. If the system serves a business premises, the paperwork around refrigerant handling matters more rather than less, and pricing for that work sits at commercial air conditioning. Record keeping obligations are heavier on commercial installations and worth confirming with the operator. A business system with no refrigerant log is a gap worth closing. Start one at the next service rather than waiting for a problem.

Timing, Seasonal Demand and Getting a Better Price

Air conditioning work has the most pronounced seasonal pricing of any trade in this category, and the reason is simple. Everyone discovers their system is not cooling on the first hot weekend in December, technicians are booked out for weeks, and prices firm accordingly. The same job in April is cheaper and available within days. Have it confirmed at booking rather than on the day.

Autumn and early spring are the value windows. Technicians have capacity, there is no urgency premium, and you can compare quotes properly rather than accepting whoever answers the phone. A system that struggled at the end of last summer should be looked at in March or April, not left until the next heatwave.

Emergency rates apply in this trade the same as any other. A weekend or after hours callout during a heatwave carries a premium of $100 to $250 over a scheduled visit, and in peak periods some operators simply will not attend outside business hours at all. The heat that makes it urgent is exactly the heat that makes it expensive. A short explanation of what was measured is reasonable to expect.

Bundling work reduces the total noticeably. If a system needs a regas and is also due a service, having both done in one visit costs less than two attendances, since the technician is already there with gauges connected. The same applies to households with more than one system, where a second unit checked during the same visit costs far less than a separate booking.

Watch for the pattern rather than the incident. A system needing gas every summer is not a system needing an annual regas, it is a system with a leak that nobody has repaired, and the cheapest year to break that cycle is the current one. Regular servicing catches leaks while they are small, which is the whole argument for maintenance rather than reaction. Have it recorded rather than described.

Licensing, Warranty and Your Records

Refrigerant handling in Australia requires a licence, and it is not the same as an electrical licence. Anyone recovering, adding or working with refrigerant needs authorisation from the Australian Refrigeration Council, and a business handling refrigerant needs a trading authorisation as well. Asking for the licence number is a normal question and any legitimate operator answers it without hesitation.

Unlicensed refrigerant work carries real consequences beyond the immediate job. Penalties apply to both the person and the business, your equipment warranty is likely void, and an insurance claim arising from the work becomes difficult. A cheap quote from someone who cannot produce a licence number will cost you more than it saves. Reluctance to answer is informative on its own.

Manufacturer warranties have specific conditions around refrigerant work and they catch people out. Most require that any refrigerant handling is performed by a licensed technician and documented, and some require evidence of scheduled servicing for the warranty to remain valid. A regas done cash in hand with no paperwork can quietly void a warranty that had years left on it.

Keep a record of every refrigerant intervention on the system. The date, the refrigerant type, the quantity added, what leak was found and what was repaired, and the technician's licence number are the useful details, and a photograph of the invoice is enough. That record shortens the next diagnosis and supports any warranty or insurance discussion. Sort that out at quote stage.

Consumer protections apply to this work as they do to any service, with work required to be carried out with due care and skill, and licensing information available through NSW Fair Trading. Work health and safety obligations for technicians working at height or with pressurised systems sit with SafeWork NSW. Those obligations sit with the operator rather than with you, but an operator ignoring them is telling you something about the rest of their work.

What to Look Out For

Be wary of any quote for a regas that does not mention finding the leak. A sealed system that has lost refrigerant has a fault, and gas alone treats the symptom while leaving you to pay again in a year or two. Ask what the leak detection process is and what it costs before agreeing to anything. On a larger job the written scope matters more.

Ask whether the charge will be weighed in. The correct quantity is on the unit's data plate and measured on scales, not judged by gauge pressure or by how cold the air feels at the vent. A technician who charges by feel will leave the system either under or over charged, and both shorten equipment life.

Confirm the ARC licence number before work starts. Refrigerant handling requires authorisation, unlicensed work can void your manufacturer warranty and complicate an insurance claim, and the question takes ten seconds. Any operator working legitimately gives you the number without pausing. Good operators cover it before being asked.

Treat a diagnosis of routine annual regassing as a reason to get a second opinion. Refrigerant is not consumed and a healthy system holds its charge for the life of the equipment, so an operator describing yearly top ups as normal maintenance is either mistaken or selling. You want somebody who looks for the leak.

Ask where the leak is once it has been found. A flare fitting at the outdoor unit is a cheap accessible repair, while an evaporator or condenser coil leak is a major component replacement that changes the repair against replace calculation entirely. The location is the number that should drive your decision. The repair against replace sum turns on it.

Get the refrigerant type and quantity written on the invoice. It confirms what you paid for, it is required information rather than a favour, and the next technician who attends will need it. An invoice showing only regas and a total does not record what went into your system.

What to Look Out for in Regassing Quotes

A good quote makes clear whether it is a regas alone or detection and repair as well. Understand exactly what's included before accepting quotes that may address symptoms without resolving underlying causes. The distinction between a regas quote and a repair quote is the most important thing on the page. One buys a summer, the other fixes the fault.

Refrigerant type should be confirmed as matching your system requirements. Quotes should specify the gas being supplied and quantity included, so you can compare two quotes properly. R32 and R410A are priced very differently to R22, so the refrigerant type explains most of the gap between two quotes. Ask which one your system uses if you do not know.

Leak detection scope should be clear, indicating methods used and whether charges apply if no leak is found. Some operators include basic detection in service charges while others itemise separately. Either is fine as long as you know which applies. What matters is that detection happens at all.

Repair authorisation procedures should be discussed, clarifying whether repair recommendations require separate approval before proceeding or are included within quoted scope. Getting that clear in advance prevents an awkward conversation with the system already open. Ask what happens if the leak turns out to be worse than expected. The general answer matters less than the one for your system.

Warranty provisions should cover both workmanship and any parts supplied. Reasonable warranties indicate confidence in work quality and provide protection if problems recur. Ask how long the warranty runs and whether it covers the refrigerant as well as the labour. A repair warranty that excludes the gas is worth much less than it sounds.

ARC licensing verification should be readily available from any legitimate operator. Request licence numbers and verify currency before engaging any refrigerant work. The number can be checked and any legitimate operator expects the question. Hesitation at that point is the clearest warning sign in this trade.