⚡ Air Conditioning

Split System Replacement Brisbane — Should You Repair or Replace Your Old Air Conditioner? (2026 Guide)

9 min readUpdated Sep 2026ARAaron · Licensed Electrician 1500996

If your old split system air conditioner is struggling to keep up with Brisbane summers, you’re probably wondering whether to repair it or replace it entirely. This guide walks through the decision — including running cost comparisons, the R22 refrigerant phase-out, and real replacement costs from a licensed Capalaba electrician.

If you just want a quick answer: replace your split system if it’s over 10 years old, uses R22 gas, or the repair cost is more than 50% of a new installation. For current installation pricing, see our split system installation cost guide. But if you want to understand exactly why and when to replace, keep reading.

Is Your Old Split System Costing You More Than a New One?

Here’s the thing most people don’t realise: an old split system doesn’t just perform worse — it costs significantly more to run. A 10-year-old unit running on R22 refrigerant with a 2-star energy rating can cost two to three times more per hour to run than a modern 6-star inverter system.

Over a Brisbane summer running 8 hours a day, that difference adds up fast. Let’s put some real numbers on it.

Old vs New — Running Cost Comparison

Based on 2026 Brisbane electricity rates (~$0.28/kWh) and 8hr/day summer usage.

So if you’re running an old 2.5kW unit from 2012, you’re paying roughly $90 more per month than you would with a new system. Over a single summer, that’s $270+ in wasted power. Over five years? That’s over $1,350 — which alone covers a big chunk of a new installation.

For a detailed breakdown of how running costs work, see our split system running costs guide.

The R22 Refrigerant Phase-Out — Why Your Old System Might Be Unrepairable

If your split system was installed before 2010, there’s a good chance it runs on R22 refrigerant (also known as HCFC-22). R22 has been phased out under the Montreal Protocol because it damages the ozone layer. Here’s what that means for you:

• No more imported R22: Australia stopped importing R22 in 2020. The only supply left is recycled gas, and it’s getting scarce.
• Prices are through the roof: Recycled R22 now costs $200-$400 per kilogram — compared to $30-$50/kg for modern R32 refrigerant. A top-up that cost $150 five years ago could now cost $500-$800.
• If your R22 system develops a leak, repairs are not viable. The cost of gas alone makes it cheaper to replace the whole unit.
• You can’t just swap refrigerants: R32 and R410A (modern refrigerants) aren’t drop-in replacements for R22. The compressor, oil, and expansion valve are all different.

The bottom line: If you have an R22 split system and it needs a gas top-up or has a refrigerant leak, it’s time to replace it. Full stop. The repair cost exceeds the replacement cost.

Repair vs Replace — The Decision Framework

Here’s the simple framework I use with customers. Ask yourself these four questions:

1. How old is your split system?

Split systems typically last 10-15 years. After 10 years, efficiency drops significantly and parts become harder to find. If your unit is over 12 years old, replacement is almost always the better investment.

2. What’s the repair cost as a percentage of replacement?

• Under 25% ($300-$500): Repair makes sense if the unit is under 8 years old.
• 25-50% ($500-$1,000): Borderline. Factor in the age and efficiency of the current unit.
• Over 50% ($1,000+): Replace it. You’re throwing money at an old system.

3. Does it use R22 refrigerant?

If yes, repair is almost never worth it. A single gas top-up can cost $500-$800, and if there’s a leak, you’ll be back again next year.

4. How much longer do you plan to stay in the home?

If you’re planning to stay 5+ years, a new system pays for itself through energy savings alone. If you’re selling within 2 years, a basic repair to get you through might make more sense.

How Much Does Split System Replacement Cost in Brisbane? (2026)

Here’s what you can expect to pay for a full replacement — including removal of the old unit, installation of the new one, and all electrical work:

What’s included: Removal and disposal of old unit, supply and installation of new split system, back-to-back installation, electrical connection, vacuum test, commissioning, and Electrical Safety Certificate.

What may cost extra: Switchboard upgrade ($400-$1,200), longer pipe runs, stainless steel coastal brackets ($150-$250), additional electrical work.

For a full breakdown of what affects the price, read our split system installation cost guide.

Real Brisbane Replacement Examples

Here are some actual replacements we’ve done in the Redlands area:

Capalaba — 3.5kW Daikin Cora Replacement

The customer had a 14-year-old Fujitsu unit that was struggling to cool their master bedroom. Compressor was failing and it was running on R22. Total replacement cost: $1,850 including removal. Their summer power bill dropped by approximately $80/month after the swap.

Cleveland — 7.0kW Mitsubishi Electric Replacement

An old 7.0kW non-inverter unit in a large open-plan living area. The customer was spending over $350/month running it in summer. We replaced it with a 7.0kW Mitsubishi Electric Avant inverter. Total cost: $3,200 including stainless steel coastal brackets. Estimated annual saving: $1,200+ in running costs.

Victoria Point — 2.5kW + 3.5kW Dual Replacement

Two old R22 units, both with leaking refrigerant. Rather than paying $1,200+ for gas top-ups that wouldn’t last, the customer replaced both units with new Daikin inverter systems. Total cost: $3,600 for both installed. Combined summer running cost dropped from ~$320/month to ~$120/month.

When Does Repair Actually Make Sense?

Repair is the right call in these specific situations:

• Minor faults on a system under 8 years old: A faulty capacitor, blocked drain line, or dirty sensor — these are cheap fixes ($150-$300) on a relatively modern unit.
• Simple refrigerant top-up on a modern system: If your unit uses R32 or R410A (not R22) and just needs a small top-up, that’s typically $250-$400 and worth doing.
• Fan motor replacement on a 5-7 year old system: Usually $350-$550. If the rest of the system is in good condition, it’s worth repairing.
• You’re selling the property soon: A basic repair might be enough to get you through settlement, and the new owners can choose their own system.

For a full breakdown of common repair costs, see our AC repair cost guide.

What to Look For in a New Split System

If you’ve decided to replace, here’s what matters for Brisbane conditions:

• Minimum 5-star energy rating — 6-star is better. The upfront cost difference is small, but the running cost difference over 10 years is thousands of dollars.
• Inverter technology — all modern units are inverter, but confirm. Non-inverter units are still sold at budget prices and they’re not worth it.
• Corrosion-resistant coating — essential if you’re within 2km of the bay (most of the Redlands). Daikin and Mitsubishi Electric include this as standard.
• Reverse cycle — Brisbane winters are mild, but a reverse cycle system means you don’t need separate heating.
• WiFi/app control — nice to have for pre-cooling your home before you get home from work.

For brand comparisons, see our best split system brands guide.

How the Replacement Process Works

1. Site inspection — We check the existing location, pipework, electrical supply, and switchboard capacity.
2. Old unit removal — We recover the refrigerant (legally required), disconnect and remove both indoor and outdoor units.
3. Bracket and pipework prep — New brackets if needed (stainless steel for coastal areas), new pipework connections.
4. New unit installation — Mount indoor unit, mount outdoor unit, connect pipework and electrical.
5. Vacuum test — Critical step. We pull a vacuum on the refrigerant lines to remove moisture and check for leaks.
6. Commissioning — Start the system, check pressures, temperatures, and airflow. Test all modes.
7. Paperwork — Electrical Safety Certificate, warranty registration, and user handover.

Total time: 3-5 hours for a standard back-to-back replacement. For a detailed walkthrough, see our split system installation day guide.

Frequently Asked Questions

How much does it cost to replace a split system air conditioner in Brisbane?

A full replacement including removal of the old unit costs $1,400-$3,500 depending on the size and brand. This includes installation, electrical connection, and disposal of the old unit.

Should I repair or replace my 10-year-old split system?

Replace it. After 10 years, efficiency has dropped significantly, parts are harder to find, and the running cost savings from a modern inverter system will offset the replacement cost within 3-5 years.

Can I replace just the outdoor unit of my split system?

Generally no. Indoor and outdoor units are matched pairs — they’re designed to work together. Replacing only the outdoor unit with a different model will result in poor performance, reduced efficiency, and potential compressor damage.

How long does a split system air conditioner last?

10-15 years for a well-maintained system. Units near the coast (within 2km of the bay) typically last 8-12 years due to salt air corrosion.

What refrigerant do new split systems use?

Most new split systems use R32 refrigerant. It’s more efficient than older refrigerants, has a lower global warming potential, and is cheaper to service. Some systems still use R410A, but R32 is becoming the standard.

Do I need a new circuit for a split system replacement?

If the existing electrical circuit is in good condition and meets current standards, we can reuse it. However, if your switchboard has old ceramic fuses or the wiring is outdated, an upgrade may be required. See our switchboard replacement guide for more information.

Is it worth replacing a split system before it breaks?

Yes, if it’s over 10 years old and using R22 refrigerant. Proactive replacement means you choose the timing (avoiding emergency call-out fees in a heatwave) and you start saving on running costs immediately.

What brands do you recommend for replacement?

For Brisbane conditions, Daikin and Mitsubishi Electric are the most reliable choices. Both offer corrosion-resistant coils as standard, excellent parts availability, and strong warranties. Haier and TCL offer good value for budget-conscious replacements. See our brand comparison guide.

Do you offer a warranty on replacement installations?

Yes. Amplus Electrical & Air provides a 5-year warranty on all installed split systems (manufacturer’s warranty plus our workmanship guarantee). ARCtick licence L183747.

How do I know what size replacement split system I need?

If you’re replacing an existing unit, we typically match the capacity (kW) to the room size. However, if you’ve renovated or changed the room layout since the original installation, we may recommend a different size. See our split system sizing guide for details.