How Often Should Air Conditioners Be Serviced?

When was the last time you had your air conditioner serviced? If you’re still scratching your head or guessing, there’s a good chance it’s overdue.

In South Australia, where the hot summers and chilly winters are part of life, your air conditioning unit works hard all year. But like any machine, it needs regular attention to run smoothly, efficiently, and safely.

So the big question is: how often should air conditioner systems be serviced? Let’s break it down.

Why Regular Servicing Matters for Your Air Conditioner

Neglecting your air conditioning system might not show immediate issues, but over time, dust, grime, and wear can build up, leading to:

• Poor air quality inside your home
• Higher running costs
• Unexpected breakdowns
• Reduced system lifespan
• Rising energy bills

Getting your AC serviced on time can prevent all of the above. Keeping your filters clean, checking condenser coils, and monitoring refrigerant levels are essential for energy efficiency and healthy indoor environments. 

How Often Do You Need to Service Your Air Conditioner?

For most Australian homes, the general rule is:

Once a year.

Yes, an annual service is usually enough for a typical split system air conditioner. However, the frequency can vary depending on:

• How often you use your unit
• Whether it’s a ducted system, wall-mounted, or reverse-cycle
• Your location (rural homes often face more dust)
• Whether it’s used for cooling, heating, or both
• The number of people or pets in the home

At REQ Refrigeration and Air Conditioning, we recommend the following:

System Type	How Often to Service
Split Systems	Every 12 months
Ducted Systems	Every 12 months (plus filter check every 6 months)
Commercial Units	Every 3–6 months
Rental Properties	Annually by landlord or property manager

For heavy-use households (daily cooling in summer and heating in winter), we recommend a mid-season check in addition to the regular servicing.

What’s Included in an Air Conditioning Service?

When you get your air conditioner serviced by our licensed technicians, it’s more than just wiping down the vents.

Here’s what a comprehensive service includes:

• Cleaning or replacing air filters
• Checking drain lines for blockages
• Inspecting and cleaning condenser coils
• Testing refrigerant levels and topping up if needed
• Inspecting the outdoor unit for obstructions
• Checking for strange noise coming from the unit
• Ensuring it’s installed correctly and operating safely
• Inspecting all electrical connections
• Measuring airflow and temperature output
• Verifying thermostat performance

Each of these steps ensures your air conditioning unit is working properly and maintaining peak performance.

The Risks of Skipping Servicing

Avoiding regular maintenance can lead to significant issues. These include:

• Poor cooling during heatwaves
• Sudden failure during winter
• Mould or bacteria buildup in ducts
• Premature failure of parts like the compressor
• A major spike in energy bill from reduced efficiency

Think of it like servicing your car. Skipping a service to save money could cost you thousands when the engine fails. The same logic applies to your air conditioning system.

How Often to Service Home Air Conditioner in Rental Properties?

If you’re a tenant, your landlord is legally required to ensure your air conditioner is serviced regularly and safe to use. In South Australia, this often means once per year. Tenants can (and should) report any decline in performance or airflow to their property manager early.

Signs Your AC Unit Needs Immediate Attention

Sometimes, your air conditioner needs servicing sooner than expected. Here are warning signs:

• Warm air blowing when cooling is selected
• Reduced airflow or blocked vents
• Unusual smells or mustiness
• Water leaking near the indoor unit
• Loud or strange noises from the outdoor unit
• The system cycles on and off too frequently

If you spot any of these, it’s time to get your air conditioner serviced, even if it hasn’t been 12 months yet.

How Clean Filters Help Save Money

Clogged filters restrict airflow, forcing your system to work harder and consume more energy. Cleaning your filters regularly can cut your energy bill by up to 15%.

In fact, many small units in bedrooms or studies only need a quick monthly dust-down of their filters. For larger systems, it’s part of your annual service—read more about our split system air conditioner services

Keep Your Air Conditioning Running at Maximum Efficiency

Here’s a short checklist for year-round performance:

• Regularly clean or replace air filters
• Ensure outdoor unit is clear of leaves, dust or spider webs
• Book an annual service with a qualified technician
• Report unusual noises or poor cooling ASAP
• Don’t cover vents with furniture or rugs
• Upgrade to a new unit if your system is over 10–12 years old and frequently breaking down

Frequently Asked Questions 

How often should you service an air conditioner in Australia?

Most experts recommend once every 12 months for standard home systems, and twice a year for commercial units or homes using the system for both heating and cooling.

What Is the 3-minute rule for air conditioners?

If you’ve switched your air conditioning unit off and want to turn it back on, wait at least three minutes. This gives the refrigerant time to settle and avoids damaging the compressor. It’s a simple but important tip many homeowners overlook.

Does regular servicing really lower my energy bill?

Yes. Clean filters, properly balanced refrigerant, and unclogged coils allow your air conditioning to run more efficiently, using less power to do the same job.

Can I clean the air conditioner filters myself? 

For most wall-mounted split systems, yes. You can gently remove, vacuum, or rinse filters every 4–6 weeks. But it’s best to let a technician handle deep cleaning and electrical checks. 

How do I know if my air conditioner needs servicing? 

Look out for reduced cooling, increased noise, bad smells, or higher power bills. Any of these could be signs it’s time for a professional inspection. 

Get Your Air Conditioner Serviced By Adelaide’s Top-rated Pros?

Book a free quote with REQ Refrigeration and Air Conditioning today. Let’s help you breathe easier and save on your energy bill.