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Aircon Servicing

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Almost everything that goes wrong with an Australian air conditioner between installation and replacement happens on the air side or the water side, not in the refrigerant circuit. Filters load up, the indoor coil grows a film of dust and biological growth, the drain pan blocks with the sludge that film becomes, the outdoor coil packs with lawn clippings and wattle blossom, and the fan runs out of balance. A service that addresses those restores most of the capacity a neglected system has lost.

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The refrigerant circuit is the exception, and it is a legal exception. The Australian Refrigeration Council states that any person who handles refrigerant or works on refrigeration and air conditioning equipment must hold a refrigerant handling licence, and that under the regulations it is an offence of strict liability to handle fluorocarbon refrigerant without the appropriate licence. Strict liability means intent is beside the point: the act itself is the offence.

That gives you a straightforward way to read a quote. A properly scoped annual service is mostly cleaning, inspection and measurement, and it should not involve putting gauges on the ports as a matter of routine. If a system genuinely needs refrigerant added, it has a leak, and the correct response is to find and repair the leak, not to top it up every spring. Anyone proposing an annual regas is describing a fault they are not fixing.

What an annual aircon service should actually include

Ask a business to confirm the scope in writing before the visit, because the word service is used for jobs that differ by a factor of three in time on site. For a wall-mounted split system a thorough visit runs to an hour or more; for a ducted system with several zones it is a half day.

  • Filters removed, washed or replaced, and the filter frame and seal checked so air is not bypassing the filter altogether.
  • Indoor coil and blower wheel cleaned, which is where most of the lost capacity and most of the musty smell live.
  • Drain pan and condensate line cleared and flow proven, since a blocked drain is the fault most likely to damage a ceiling.
  • Outdoor coil washed and the surrounding area cleared, with the fan and the mounting checked for vibration and corrosion.
  • Electrical connections inspected for heat damage and the running current compared with the nameplate rating.
  • Supply and return air temperatures measured and recorded, which is the non-invasive way to see whether the system is performing.
  • Controls, timers and any zone motors exercised, and the reported readings written down so next year's visit has something to compare against.

The ARC licence, and the line it draws through a service visit

The Australian Refrigeration Council administers the refrigerant handling licence on behalf of the Australian Government under the Ozone Protection and Synthetic Greenhouse Gas Management Regulations 1995. The licence covers handling that carries the risk of refrigerant emission, including decanting refrigerant and manufacturing, installing, commissioning, servicing or maintaining refrigeration and air conditioning equipment, irrespective of whether or not refrigerant is present, as well as decommissioning or disposing of equipment where refrigerant is present.

Read that scope carefully, because it is wider than most people assume. It captures servicing and maintaining the equipment whether or not refrigerant is actually present at the time, which means a technician servicing your system is working inside a licensed activity even on a visit where the gauges never come out. The reason given is environmental: fluorocarbon refrigerants are harmful to the environment if emitted to the atmosphere.

In practice this means you should be able to ask for a licence number and get one without friction. It also means that the cheapest offers, the ones advertised as a clean and check by someone with a pressure washer, are a different transaction from a service by a licensed technician. There is a place for a competent filter and coil clean, but be clear which one you are buying.

What a neglected air conditioner does before it fails

Air conditioners rarely stop dead. They decline, and the household adapts by setting the temperature lower and running the system longer, which hides the decline while increasing the bill. These are the failure paths a service is designed to interrupt.

  • Restricted airflow from a loaded filter or fouled coil, which drops capacity, raises running cost and in extreme cases ices the indoor coil.
  • A blocked condensate drain that backs up into the drain pan and then into the ceiling, which is the most expensive common failure in an Australian ducted installation.
  • Biological growth on a permanently damp indoor coil, which produces the musty smell people describe as the aircon smell and which no amount of air freshener touches.
  • Corrosion of the outdoor coil, which is accelerated near the coast and is the reason a unit in Wollongong or Cairns ages differently from one in Bendigo.
  • Vermin and insect damage inside the outdoor unit, which is common where a system sits idle through a southern winter.
  • A slow refrigerant leak, which shows up as gradually falling capacity and eventually as compressor stress, and which needs finding rather than feeding.

The owner's share between service visits

  • Clean the indoor filters at the interval in the manual, which for a household with pets or near a main road usually means monthly through the running season.
  • Keep at least the clearance the manufacturer specifies around the outdoor unit, and resist the temptation to build a screen or a garden bed tight against it.
  • Rinse leaves, grass clippings and cobwebs off the outdoor coil with a gentle hose, never a pressure washer, and only with the isolator off.
  • Watch where the condensate discharges, because a drain that has stopped dripping on a humid day has stopped draining.
  • Run the system briefly in the shoulder seasons rather than leaving it idle for six months, which keeps seals and bearings in better condition.
  • Keep doors and windows shut while it runs, and use ceiling fans alongside it rather than instead of it.

Signs the annual service needs to become a repair call

  • Water marking a ceiling below a ducted indoor unit, or dripping from a wall-mounted head.
  • Ice forming on the indoor coil or on the refrigerant pipework at the outdoor unit.
  • A sharp rise in running cost with no change in how the house is used.
  • The outdoor unit becoming noticeably noisier, or starting with a new rattle or hum.
  • The system tripping the switchboard, or the outdoor fan running while the compressor does not.
  • A musty or sour smell that returns within days of a coil clean, which points at the drain rather than the coil.

Why spring is the right month and January is the wrong one

The Australian cooling season peaks from December to February, and so does the repair queue. A service booked in September or October gets you an unhurried technician, and any fault found can be fixed before the first run of forty degree days rather than during it. That is the whole argument, and it holds in every state.

There is a regional wrinkle worth knowing. In the tropical north the system runs most of the year and the sensible service interval is shorter than in a temperate climate where it works hard for three months. On the coast, salt does to an outdoor coil in a few years what inland air does in a decade. Ask the technician what interval they would recommend for your postcode rather than assuming the national default fits.

What moves an aircon service quote, and how LokalMatch fits in

The variables are the system type and how many indoor units there are, how accessible the outdoor unit is, whether the ducted indoor unit is in a roof space that can be crawled, how long it has been since the last service, and whether a chemical clean of the indoor coil is included or quoted separately. A multi-head system is several services in one visit and should be priced as such.

LokalMatch is where the job starts, not where it ends. Describe the system type, the number of indoor units, roughly how old it is, when it was last serviced and your postcode, and air conditioning businesses covering your area contact you directly; those businesses pay LokalMatch for the requests they receive. LokalMatch does not do the work, does not set or quote prices and does not vet, rank or recommend anyone, so ask for the licence number and the scope in writing before you book.

Aircon Servicing: frequently asked questions

Does my air conditioner need regassing every year?

No. A sealed refrigerant circuit does not consume refrigerant, so a system that needs gas has a leak. The right response is to find and repair the leak and then recharge to the manufacturer's specified quantity. Repeated annual topping up is an expensive way of postponing a repair, and it releases refrigerant that the Australian Refrigeration Council's licensing regime exists specifically to keep out of the atmosphere.

Does the person servicing my air conditioner need a licence?

For the refrigerant side, yes. The Australian Refrigeration Council states that any person who handles refrigerant or works on refrigeration and air conditioning equipment must hold a refrigerant handling licence, and that the licence covers servicing or maintaining that equipment whether or not refrigerant is present. It also states that under the regulations it is an offence of strict liability to handle fluorocarbon refrigerant without the appropriate ARC licence. Ask for the licence number.

Can I clean the indoor unit myself?

The filters, yes, and doing so regularly is the single most useful thing an owner can do. The coil and blower wheel behind them are a different matter: they are delicate, easily bent, and cleaning them properly means containing the water and the biological material that comes off. Spray-can coil cleaners sold for household use often push the residue into the drain pan, which is where the smell was coming from in the first place.

How often should an air conditioner be serviced in Australia?

Annual servicing before the cooling season is the common recommendation for a household system, but the right interval depends on where you live and how hard the system works. A unit running most of the year in the tropical north, or one on a salt-exposed coastal site, warrants more frequent attention than one used for three months of a Melbourne summer. Ask the technician to recommend an interval for your postcode and your system rather than applying a national rule of thumb.

Why does my air conditioner smell musty when it starts up?

Almost always because the indoor coil and drain pan stay damp between cycles and have grown a biological film. Cleaning the coil helps, but if the smell returns quickly the drain is usually the real problem, because standing water in the pan will re-seed the coil within weeks. Ask specifically for the drain pan and condensate line to be cleared and the flow proven, not just for a coil clean.

Is a cheap clean and check the same as a service?

No, and it is worth being clear which one you are buying. A clean and check by an unlicensed operator can legitimately cover filters and the outside of the cabinet. A service by a licensed technician includes measurement, electrical inspection and an assessment of the system's condition, and it is performed within the licensed activity the Australian Refrigeration Council describes. Both have a place; only one of them will tell you whether the system has a developing fault.

Sources

  1. Australian Refrigeration Council: Refrigerant handling licence, frequently asked questions

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the cost of air conditioner maintenance

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Type of system and fuel source
  • Size and efficiency of the equipment
  • Condition of the existing ductwork and venting
  • Electrical or gas line changes
  • Access to the furnace room, attic or outdoor unit location
  • Removal and disposal of the old equipment
  • Emergency or after-hours service

How to compare HVAC technicians before you hire

  • Hire a technician who is licensed for heating, cooling and gas work in your area.
  • For a new system, ask for a load calculation for your home rather than a size based on the old unit.
  • Get written quotes that list the equipment, ductwork changes, removal of the old unit and any electrical work.
  • Ask how they handle service calls and repairs after installation, including in the middle of winter.
  • Compare the full scope of each quote, not only the equipment on it.

Questions to ask HVAC technicians before you hire

  • Are you licensed for this type of heating, cooling or gas work in my area?
  • How did you decide what size of system my home needs?
  • Does this installation need a permit, and will you take care of it?
  • What does the manufacturer's warranty cover, and what does your labour warranty cover?
  • Will you need to change the ductwork, venting or electrical to make this work?
  • Do you offer maintenance plans, and what do they include?
  • How quickly can you respond if the system stops working?

When to call a pro for air conditioner maintenance

  • If you smell gas, leave the home and call your gas utility's emergency line from outside.
  • If a carbon monoxide alarm goes off, get everyone outside and call emergency services.
  • No heat in cold weather, or a furnace that keeps shutting off
  • Unusual noises, burning smells or a big jump in energy use

Air conditioner maintenance permits and local rules

Some air conditioner maintenance work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

Permits and licensing

Seasonal maintenance

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