Reviewed by: the HVAC Shop Technical Team
Published: July 2025
Last reviewed: April 2026
Scorchers Ahead – Is Your Aircon Ready?
If you’ve done even one summer in Perth, you already know it’s not just “hot.” It’s relentless. Dry heat, high UV, and long days where your air conditioner barely gets a break.
By midday, roofs are radiating heat, walls are soaking it up, and your split system is working flat out just to keep the indoor temp livable.
👉 Start here with the right gear: browse professional split system cleaning tools and maintenance gear
Why Clean Your Split System? Especially in Perth!
Perth’s dry heat carries fine dust that settles deep into coils and filters, reducing efficiency and airflow.
Over time, this buildup forms a layer across the evaporator coil, acting like insulation and reducing heat transfer.
How Your Split System Works (No Tech Degree Needed)
Your split system removes heat from inside your home and releases it outside. Airflow and clean coil surfaces are critical for this process.
Step-by-Step DIY Split System Cleaning Guide
1. Remove & Clean the Filters
Remove the filters, clean them thoroughly, and allow them to dry completely before reinstalling.
If replacement is needed, check this air conditioner maintenance collection.
2. Wipe the Louver Blades and Housing
Dust buildup on louvers eventually re-enters the system. Clean gently with a microfiber cloth.
3. Clean the Cooling Coils (Indoor Unit)
Apply a no-rinse coil cleaner evenly across the coil.
Use a proven solution like Viper coil cleaner foam for best results.
4. Check and Clear the Drain Pipe
Blocked drains cause leaks and odours. Clearing them restores proper function.
5. Outdoor Unit Check (Condenser)
Ensure proper airflow around the condenser and remove debris.
Aussie Buyer’s Guide: What You Might Need
Having the right tools turns this from a messy job into a clean, efficient process. A proper cleaning bag is one of the most important pieces of gear. It captures runoff from coil cleaning and prevents water damage inside the home.
A reliable option is a heavy-duty split system cleaning bag, designed specifically for wall-mounted indoor units.
Pair that with a coil cleaner and you’ve got the core setup sorted. For a more complete approach, a complete air conditioner cleaning kits
| Tool | Purpose | Why It Matters |
|---|---|---|
| Cleaning Bag | Captures runoff | Prevents wall and floor damage |
| Coil Cleaner | Removes grime | Restores heat transfer efficiency |
| Replacement Filters | Restores airflow | Reduces system strain |
| Cleaning Kit | All-in-one solution | Saves time and ensures proper process |
Maintenance Must-Knows for Perth Homes
In Perth, systems run harder and longer than in most other Australian cities. That means maintenance intervals need to be tighter. Filters should be cleaned every two to three months during summer. Coil cleaning should be done at least twice a year.
Homes with pets, high dust exposure, or frequent usage may need even more frequent cleaning. Compared to Melbourne or Sydney, where seasonal use is more balanced, Perth systems face sustained high load conditions for extended periods.
When to Upgrade Instead
If your system is older than ten years and still struggles after cleaning, it may be reaching the end of its lifecycle. Older units often lack inverter technology, making them less efficient and more expensive to run.
Newer systems deliver more stable temperature control, lower energy consumption, and better overall performance. In many cases, upgrading becomes the more cost-effective option over time.
Client Story: Meet Jack from Joondalup
Jack nearly replaced his system after it struggled through a 43°C heatwave. Instead, he followed a proper cleaning process using a coil cleaner and replacement filters. The result was immediate. Airflow improved, cooling returned to normal, and the system stopped running constantly.
What felt like a failing unit turned out to be a maintenance issue.
Key Takeaways
Regular cleaning improves airflow, efficiency, and lifespan of your system.
Stay Cool This Summer
🛒 Shop now: explore split system cleaning tools and maintenance gear
FAQs
Q: How often should I clean my AC filters in Perth?
A: Every 2–3 months during summer, or more often in dusty environments.
Q: Can I clean my split system myself?
A: Yes, basic cleaning can be done safely with proper tools.
Q: Why does my aircon smell musty?
A: Usually mould or bacteria buildup inside the unit.
Q: Will cleaning reduce power bills?
A: Yes, improved airflow and efficiency reduce energy consumption.