That musty smell when your split system starts up isn’t the unit being old — it’s mould. The evaporator coil inside your indoor head condenses water out of the air every time the system runs, and in Brisbane’s humidity that damp, dark, dust-fed space becomes an ideal breeding ground for Cladosporium mould, bacteria and biofilm. Once it takes hold on the blower barrel and coil fins, every start-up blows those spores into the room you sleep in.
Split system cleaning is a dedicated deep clean of the indoor head and outdoor condenser. It is not the same as rinsing your filters, which only addresses the first layer of contamination. We bag the unit, remove the blower barrel where the design allows, chemically treat and pressure-wash the coil and barrel, sanitise the drain pan and flush the condensate line — all with runoff fully captured so nothing touches your wall or floor.
Signs your split system needs cleaning
- Musty, damp or sour odour on start-up
- Black or dark green speckling visible on the barrel fan or louvres
- Sneezing, congestion or asthma symptoms that worsen when the unit runs
- Weaker airflow than the unit used to have
- Longer cooling times and rising power bills
- Dust or dark particles blown from the vents
- Water dripping from the indoor head
- Rattling or whistling from the fan barrel
- More than two to three years since the last professional clean
Benefits of a Professional Split System Clean
- Removes mould and bacteria at the source rather than masking odour with deodoriser sprays.
- Measurably better indoor air quality, which matters most in bedrooms where you breathe that air for eight hours a night.
- Restores airflow and cooling. A dust-caked barrel can strangle airflow; cleaning it commonly recovers several degrees of temperature split.
- Lower power bills. A fouled evaporator coil forces longer run times and higher compressor load.
- Stops water leaks by clearing the drain pan and line before they overflow onto your plasterboard.
- Quieter operation, since uneven dust buildup on the barrel causes imbalance, vibration and whistling.
- Longer equipment life through reduced strain on the fan motor and compressor.
- Warranty support, as most manufacturers require documented cleaning and maintenance.
Our Split System Cleaning Process
Inspection and assessment
We open the indoor head and show you the actual state of the coil, blower barrel and drain pan. You decide with full information whether a standard clean or a full chemical deep clean is warranted.
Protection
Drop sheets under the unit, furniture covered, and a purpose-made cleaning bag with a catch bladder fitted around the indoor head so every drop of water and chemical is captured.
Dismantling
Front cover, filters and louvre assembly removed. On a full deep clean the blower barrel is removed as well — this is the only way to clean between the vanes, which is where most of the contamination actually sits.
Chemical treatment
A coil-safe anti-microbial cleaner is applied to the evaporator coil and blower barrel and left to dwell so it penetrates and lifts embedded biofilm rather than just wetting the surface.
Pressure washing
Low-pressure, high-volume rinsing flushes the fin pack and barrel clean without bending fins or driving water into electronics. Contaminated runoff drains into the catch bladder.
Drain pan and condensate line
Pan scrubbed and sanitised, drain line flushed and cleared, and a slow-release anti-microbial tablet fitted to inhibit regrowth.
Filters, casing and louvres
Filters washed and sanitised, or replaced if perished. Casing, louvres and front panel wiped with anti-bacterial solution.
Outdoor condenser clean
Casing opened, leaves and debris cleared, coil washed with the appropriate cleaner, bent fins combed straight, fan blade and base drain cleared. This matters for coastal suburbs where salt accelerates corrosion.
Sanitise, reassemble and test
Final anti-microbial mist applied, unit reassembled, then run in cooling to dry the coil and verify restored airflow, temperature split and drainage. Site left clean, and we show you the before-and-after.
Indicative Split System Cleaning Costs
AUD including GST. Multi-unit discounts apply when several systems are cleaned in the same visit.
Cleaning service | Indicative cost |
Basic clean — filters, louvres, drain flush | $110 – $180 |
Standard clean — indoor head plus outdoor unit | $180 – $300 |
Full chemical deep clean — single split | $250 – $420 |
Deep clean with blower barrel removal | $320 – $520 |
Each additional split system, same visit | $150 – $280 |
Multi-head system, 2 indoor heads | $400 – $700 |
Multi-head system, 3–4 indoor heads | $600 – $1,100 |
Floor-mounted or bulkhead split | $280 – $480 |
Heavy mould remediation | $450 – $900 |
Anti-microbial drain treatment (add-on) | $40 – $80 |
Replacement filters (per filter) | $30 – $120 |
Clean plus full service, bundled | $350 – $600 |
Brands We Clean
Daikin, Mitsubishi Electric, Mitsubishi Heavy Industries, Fujitsu, Panasonic, ActronAir, LG, Samsung and Carrier, plus most other brands sold in Australia.
Brand knowledge genuinely matters here. Several manufacturers use hydrophilic or anti-corrosion coil coatings that are stripped by the wrong chemical, some models have blower barrels that cannot be removed without specific tooling, and units with built-in self-clean or streamer functions need their sensors and components protected during washing. We match the chemistry and the dismantling procedure to your unit so nothing is damaged.
Service Areas
Split system cleaning across North Brisbane, South Brisbane, East Brisbane, West Brisbane, Brisbane CBD, Indooroopilly, Toowong, Chermside, Carindale, Sunnybank, Logan, Ipswich, Redlands and Moreton Bay.
Frequently Asked Questions
How often should a split system be professionally cleaned in Brisbane?
Every two to three years for typical household use. Annually if you have pets, run the system year-round, live near the coast, smoke indoors, or anyone in the home has asthma or allergies. Bedroom units generally warrant more frequent cleaning than living areas because of the hours of exposure.
Is the black speckling actually mould?
Yes, in almost every case. It’s usually Cladosporium, a common indoor mould that thrives on condensation and dust. It is a recognised trigger for asthma and allergic rhinitis, and wiping the visible surface does nothing about the growth deep in the coil and between the barrel vanes.
Can’t I just clean it myself?
Wash the filters yourself every four to six weeks — that part is genuinely worth doing. Beyond that, DIY carries real risk. Consumer aerosol coil cleaners often leave a residue that attracts more dust, water gets into the PCB and sensors, fins bend easily, and neither the blower barrel nor the drain pan can be reached without dismantling the unit.
How long does it take?
Around 1.5 to 2.5 hours for a single split. A full deep clean with barrel removal is toward the upper end. Multi-head systems take roughly an hour per additional head.
Will it make a mess of my wall and floor?
No. The fitted cleaning bag and catch bladder capture all water and chemical runoff, and drop sheets protect the floor. Your wall stays dry.
Are the chemicals safe around children and pets?
We use hospital-grade anti-microbial products approved for HVAC use, applied and rinsed per manufacturer directions. We recommend keeping children and pets out of the room during the clean and ventilating for an hour afterward; once reassembled and run, the space is safe.
How do I stop the smell coming back?
Wash your filters regularly and let the coil dry out after use — run fan-only mode for 15–20 minutes before shutting down, or use the “dry”, “clean” or “self-clean” function if your unit has one. Keeping the drain treated also helps considerably.
Will cleaning fix my unit if it isn’t cooling properly?
Sometimes, yes — restricted airflow from a fouled coil and barrel is a very common cause of poor cooling, and a clean resolves it. But if the cause is low refrigerant, a failed capacitor or a faulty sensor, you need a repair. We assess and tell you which it is rather than selling you a clean that won’t help.
What’s the difference between a clean and a service?
A service is a performance and mechanical inspection with light cleaning included. A deep clean is a focused sanitisation involving dismantling and chemical washing. Many customers book both together and we discount the bundle.
Do you clean the outdoor unit too?
Yes, it’s included in our standard and deep clean packages. It matters more than people expect — a dirty condenser coil raises head pressure, cuts efficiency and shortens compressor life, and in bayside suburbs salt buildup accelerates fin corrosion.
