In Melbourne, we’re known for four seasons in one day—but come winter, it’s mostly just cold. That’s when the trusty split system flips from keeping us cool to keeping us cosy. But here’s the catch: if it’s clogged with dust, full of mould, or hasn’t had a clean since last year, you’re in for weak airflow, bad smells, and a power bill that stings more than the morning frost.
Whether you’re in Coburg, St Kilda or down the Mornington Peninsula, winter is when your split system works double time. And giving it a proper clean before the cold hits isn’t just about comfort—it’s about efficiency, health, and getting more years out of your investment.
In this guide, we’ll break down:
- Why cleaning matters before winter kicks in
- How to clean your split system aircon the right way
- The best split system cleaning bags (and why they’re a winter essential in Melbourne)
- Ongoing maintenance tips for the cooler months
- Signs it might be time for a new unit
- A real story from a Melbourne local
- FAQs to answer all your cleaning questions
Let’s get into it before winter gets into you.
Why Cleaning Your Split System Before Winter Matters (Especially in Melbourne)
Melbourne winters can be dry, damp, and everything in between. When you switch your aircon from cool to heat mode, it pulls in dust, pet dander, mould spores and whatever else has been collecting in your unit since summer.
Here’s what a dirty unit might give you:
- That musty “funky socks” smell when you first turn it on
- Inefficient heating (hello, rising bills!)
- Allergies flaring up from airborne nasties
- Poor airflow, even on max setting
And let’s not forget how much more we’re indoors during the cold months. A clean unit means better indoor air quality, less strain on your lungs, and less wear on your split system.
"Our heating was barely making a difference last winter. Thought the unit was on its last legs, but it was just filthy inside. A clean and a filter change made it feel brand new again."
How to Clean Your Split System for Winter (Without Breaking It)
This is for the DIYers who don’t mind a little maintenance. Here’s how to get started:
1. Switch off the unit and unplug Safety first. Don’t work on any electrical appliance while it’s live.
2. Remove and clean the filters
- Lift the front panel and gently slide the filters out.
- Rinse with warm water.
- Dry completely before reinstalling.
3. Clean the coils and fins
- Use a no-rinse coil cleaner from our split system cleaning collection.
- If you want to avoid mess on your floors or walls, this is where a split system cleaning bag is a game-changer (more on that below).
- Spray and let the foam work its magic.
4. Wipe down the casing
- Use a micro fibre cloth and a gentle spray cleaner.
5. Check the drain pipe
- Look for mould, blockages, or water pooling. Flush it out with warm water or diluted vinegar if needed.
6. Disinfect and deodorize
- Use an aircon-safe antibacterial spray inside the unit and on the filters.
Melbourne Must-Have: Best
Split System Cleaning Bags
If there’s one tool that makes this whole process less messy and more professional, it’s the humble cleaning bag.
What is a split system cleaning bag? It’s a waterproof, wraparound bag that catches all the gunk, spray, and grime that comes out during coil cleaning. Perfect for apartments, tight spaces, or homes with carpet and timber floors.
Why it’s perfect for Melbourne homes:
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Protects your wall and flooring from runoff
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Speeds up the clean-up process
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Lets you use more thorough cleaning sprays without worry
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Reusable for multiple cleans throughout the year
Check out the range of pro-grade options in our cleaning collection.
Tip: Pair your bag with a pressurized spray or pump bottle for even application.
Ongoing Maintenance Through the Melbourne Chill
Once the deep clean is done, here’s how to keep your split system ticking through winter:
1. Clean filters monthly Even when heating, your system pulls in dust.
2. Run the fan-only mode once a week This helps dry out condensation and prevent mould.
3. Keep vents clear Don’t block indoor units with furniture or curtains.
4. Inspect the outdoor unit Make sure it’s not covered in leaves or spiderwebs. A quick brush or hose-down can do wonders.
5. Book a professional clean yearly If you’re not up for DIY or want a deep clean of internal components, get a tradie in just before winter.
When to Clean vs When to Replace
Sometimes even the best cleaning bags and coil sprays can’t save a unit that’s well past its use-by date.
Time to consider a replacement if:
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Your split system is more than 10-12 years old
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It still smells or performs poorly after a deep clean
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Repairs are getting frequent and expensive
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Your energy bills keep creeping up
Modern split systems are more energy-efficient and feature smart controls. A new unit could pay for itself in reduced power costs over time.
Real Story: Nathan from Preston VIC
Nathan runs a small architecture studio out of his converted garage. He relies on his split system to keep clients comfy during winter meetings.
"I was embarrassed when a client commented on the stale smell. I bought a coil cleaner and cleaning bag online that night. Followed a how-to video, and the next morning it was fresh as a daisy. Took less than an hour and saved me a callout."
Key Takeaways
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Cleaning your split system before Melbourne winter boosts heating performance
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Split system cleaning bags make the job cleaner and easier
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Monthly filter cleaning and annual deep cleans keep your air fresher
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DIY kits help you save money and avoid technician delays
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Fast shipping available from HVAC Shop across Victoria
Don’t wait for the first cold snap to find out your aircon isn’t ready. Stock up now and give your split system a proper Melbourne winter prep.
Shop our full range of split system cleaning bags, coil cleaners, and accessories here — fast shipping across Victoria.
FAQs
Q: How often should I clean my split system before or during winter?
A: Do a deep clean before winter starts, and keep filters clean monthly.
Q: Are cleaning bags reusable?
A: Yes! Many are made from durable PVC and last for years with proper care.
Q: Do I need to rinse the coil cleaner?
A: Most sprays are no-rinse, but always check the label.
Q: What’s the best way to deodorise the unit?
A: Use a dedicated antibacterial spray designed for aircons.
Q: Can I clean it myself or should I call a pro?
A: You can do basic cleaning yourself. For internal fan barrels or serious mould, call in a tradie.