Cleaning your split system air conditioner might sound like a big job, but it’s actually pretty simple – and totally worth it.
A clean unit runs more efficiently, keeps your energy bills down, and gives you cleaner, healthier air to breathe. Over time, dust, dirt and even mould can build up inside your system, affecting its performance and the air quality in your home.
Fortunately, you don’t need to be a professional to give your unit a good clean. With just a few basic tools and a little time, you can get your split system back in top shape.
In this quick and easy guide, we’ll walk you through everything you need to know to safely and effectively clean your air conditioner – inside and out.
What You’ll Need Before You Start
Before you roll up your sleeves and start cleaning your split system air conditioner, it’s a good idea to gather everything you’ll need. Having the right tools on hand makes the job quicker, easier, and more effective.
Here’s a handy checklist to get you started:
- Soft cloth or microfibre cloths – Great for wiping down surfaces without scratching them.
- Vacuum cleaner with brush attachment – Perfect for removing dust from filters and vents.
- Mild detergent or coil cleaner – For gently cleaning the filters and coils.
- Spray bottle – To apply cleaning solution with control.
- Warm water – To rinse off detergent from washable parts.
- Soft brush or paintbrush – Useful for loosening dust in hard-to-reach areas.
- Screwdriver – In case you need to remove panels (check your unit’s manual first).
- Face mask and gloves (optional) – For protection if you’re sensitive to dust or mould.
And don’t forget the most important step – turn off the power to the unit before you start cleaning. Always put safety first.
Cleaning the Indoor Unit (Evaporator)
Cleaning the indoor unit of your split system air conditioner helps keep the air fresh and your system running efficiently. Here’s a simple step-by-step guide to get it done safely and effectively:
- Turn off the power – Always switch off the unit at the wall to avoid any electrical risks.
- Open the front cover – Gently lift or unclip the panel to access the air filters.
- Remove the filters – Carefully slide them out. Most filters are washable – just check your manual to be sure.
- Vacuum the filters – Use a brush attachment to remove dust and dirt.
- Wash with warm, soapy water – Rinse thoroughly and let them dry completely before reinserting.
- Wipe the evaporator coils – Use a soft, damp cloth or brush to carefully remove surface dust.
- Clean the panel and vents – Give the cover and louvres a wipe-down with a damp cloth.
Once everything’s clean and dry, reassemble the unit and turn the power back on. Your system should now be fresher and ready to go.
Cleaning the Outdoor Unit (Condenser)
Your outdoor unit does a lot of the heavy lifting, so keeping it clean is just as important as the indoor part. Dust, leaves and grime can build up around the condenser, making your system work harder than it needs to.
Here’s how to give it a good clean:
- Turn off the power – Always switch off the unit at the main power source before starting.
- Clear the area – Remove any leaves, dirt, or debris around the unit for proper airflow.
- Remove the top cover (if needed) – Use a screwdriver if your model allows for easy access (check your manual).
- Vacuum or brush the fins – Gently clean the metal fins using a soft brush or vacuum with a brush attachment.
- Spray with a garden hose – Use low pressure to rinse off dirt, spraying from the inside out if possible.
- Check for obstructions or damage – Look for anything unusual like bent fins or signs of corrosion.
A clean condenser helps your system stay efficient, cool faster and last longer.
How Often Should You Clean Your System?
A good rule of thumb is to clean your split system air conditioner at least once every three months.
However, how often you really need to clean it depends on how much you use it and where you live. If you’re running it every day during summer or winter, or if you live in a dusty area or have pets indoors, you might want to clean it more regularly – around every month or so.
The air filters, in particular, should be checked monthly. These can collect dust, pet hair, and other airborne particles pretty quickly. A clogged filter not only reduces your air quality but also makes your system work harder, which can drive up your energy bills.
Even if everything looks fine from the outside, your unit could still be harbouring dust and mould inside. That’s why an occasional deep clean is important. And don’t forget the outdoor unit – keeping it clear of leaves and dirt will help it run smoothly too. Regular maintenance keeps your split system efficient, clean and long-lasting.
When to Call a Professional
While regular cleaning of your split system can be a DIY task, there are times when it’s best to call in a professional
If you notice strange smells, unusual noises, or reduced airflow even after you’ve cleaned the filters, your unit might have a deeper issue – like mould buildup, blocked drainage, or a refrigerant leak. These aren’t problems you want to mess with on your own.
Professionals have the tools and expertise to safely access internal components, deep-clean the evaporator coils, and check for hidden faults.
If it’s been over a year since your last service, booking a professional clean is a smart move. They can give your system a full check-up, clean areas you can’t reach, and help keep it running efficiently.
Also, if you’re unsure about anything while attempting to clean your unit – like removing the front panel or dealing with electrical components – it’s better to be safe than sorry. Getting a qualified technician in can save you time, hassle and potentially costly repairs down the track.
Your Aircon Will Thank You
Cleaning your split system air conditioner doesn’t have to be a chore. With just a few basic tools and a little time, you can make a big difference to your home’s air quality and your system’s performance.
Regular cleaning – both indoors and out – helps your aircon run more efficiently, lowers your energy bills and extends the life of the unit. Plus, it keeps the air in your home fresh and healthy.
Just remember to turn off the power before you start, and don’t hesitate to call a professional if things look a bit too tricky. Make it part of your seasonal home maintenance routine and your aircon will thank you. A clean split system is a happy one – and so is the person using it.
Please note: This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See our Terms & Conditions here.
FAQs About Cleaning a Split System AC
Do you have any questions about cleaning a split system air conditioner? If so, we’ve got answers to the most commonly asked questions right here.
It’s a good idea to clean your system every three months, especially during heavy-use seasons like summer or winter. If you have pets or live in a dusty area, monthly filter cleaning can help keep things running smoothly. A professional deep clean once a year is also recommended.
Yes, you can absolutely clean the filters and wipe down the unit yourself – it’s a simple task with the right tools. However, if you notice mould, bad smells, or reduced performance, it’s best to call in a professional for a thorough clean and system check-up.
If your system gets clogged with dust and dirt, it has to work harder, which can drive up your energy bills and wear out the parts faster. You might also notice reduced airflow, strange smells or even allergy symptoms due to poor air quality.
