Replacing Gas Ducted Heating: Key Tips for Melbourne 2026

If your gas ducted heater has significantly aged—usually around 15, 20, or even 25 years—you may have begun to notice various performance changes. For instance, you might find that it takes longer to warm your home effectively. Additionally, you may have observed an increase in your gas bills without any alterations in your usage habits. Furthermore, the recent announcements regarding Victoria transitioning away from gas systems could leave you pondering how this shift impacts your situation.

You are certainly not alone in facing this predicament. A multitude of homeowners in Melbourne are grappling with similar issues, weighing whether to repair their existing systems, replace them with another gas heater, or choose electric heating. With an overwhelming amount of information available, it is essential to clarify the current landscape and carefully explore the options available for your future.

Key Factors Driving the Increase in Gas Ducted System Replacements

Several critical factors are converging at this pivotal moment, influencing the decision to replace gas ducted systems.

To start, a significant number of gas ducted heaters that were installed during the early 2000s (and even back to the 1990s) are now nearing the end of their operational lifespan. These units were originally designed to operate efficiently for 15 to 20 years, and many have now exceeded that anticipated duration. As these systems continue to age, sourcing replacement parts becomes increasingly arduous, their overall efficiency diminishes, and ultimately, it often becomes more economically sensible to replace them rather than continually investing in repairs.

In addition, Victoria is actively endorsing electrification in its energy policy. Starting in January 2024, the state government will prohibit gas connections in new homes. While this does not necessitate the immediate removal of your existing gas system, it does indicate a clear trend towards electrification. Moreover, incentives and rebates are increasingly favouring electric systems, while the costs associated with maintaining the gas network are on the rise, suggesting that your gas bills are likely to continue increasing in the future.

Finally, and perhaps most importantly, the technology surrounding reverse cycle systems has made remarkable strides. A decade ago, ducted reverse cycle systems in Melbourne were often met with doubt due to the performance limitations of older models in harsh cold. Fortunately, this view has changed significantly; contemporary systems now efficiently manage the chill of Melbourne winters without issue.

Evaluating Your Choices: An In-Depth Look at the Pros and Cons

When your gas ducted heater starts exhibiting signs of failure, you generally have three potential options available to you.

1. Consider Repairing Your Current Heating System

If your heating system is less than 15 years old and the problem is relatively minor, such as a faulty fan motor, ignition module, or thermostat, it may be worth contemplating a repair. This could involve a cost of a few hundred pounds and might extend the life of your unit for several additional years. However, if you discover a cracked heat exchanger (a significant safety concern, not merely a comfort issue) or if your unit has surpassed the 20-year mark, investing in repairs may lead to further complications in the future. Be honest with yourself about your system's current condition and its remaining lifespan.

2. Upgrade to a New Gas Ducted Heating Unit

Indeed, this remains a viable option for homeowners. Existing gas connections are permitted to continue operating—there is no obligation for an immediate switch to electric. A new gas ducted heater will typically offer greater efficiency compared to your older model, and if your current ductwork is in good condition, you may be able to reuse it, which can help manage your costs. However, it is essential to remember that you would be investing in a system that relies on a fuel source that Victoria is progressively moving away from. The gas prices are unlikely to decrease, and potential buyers will increasingly consider running costs when you eventually sell your home. While this choice may not be incorrect for everyone, it is crucial to approach the decision with a full understanding of the implications involved.

3. Transitioning to Ducted Reverse Cycle Electric Heating

This option is where the majority of homeowners are heading in 2026, and for good reason. A ducted reverse cycle system provides both heating and cooling from a single unit. This means you can reduce your reliance on gas (or at least decrease your dependence on gas for heating), lower your running costs, and qualify for Victorian Energy Upgrades (VEU) rebates, which can significantly offset your installation costs. The downside is that the initial investment for this system is generally higher than a straightforward gas replacement, particularly if your existing ductwork requires alteration or replacement. Nevertheless, when you factor in the rebates, the potential for reduced ongoing costs, and the dual functionality of heating and cooling, the financial rationale typically adds up positively over a period of 5 to 7 years.

Navigating the Replacement Process: A Comprehensive Step-by-Step Guide

Many individuals seek clarity regarding what to expect during the replacement process, so here is an overview of the key stages involved.

• Initial Assessment: A qualified professional visits your home to evaluate your current system, inspect the ductwork, measure the space, and discuss your specific needs. Many installers make the mistake of providing quotes based on rough estimates rather than thorough load calculations. If someone offers a quote without taking proper measurements, this should raise a red flag.
• Detailed Quote and Planning: You will receive a comprehensive written quote that covers the unit, any necessary modifications to the ductwork, electrical work, and the process of gas disconnection. This ensures that no surprises arise on the day of installation.
• Installation Day(s): For a straightforward gas-to-gas swap where the existing ductwork is reusable, the process usually takes one day. If you are switching to a full reverse cycle system with new ductwork, expect the installation to last two to three days. Be mindful that you will not have heating during this period, so it is wise not to schedule it during the coldest months of July.
• System Commissioning: After installation, the system will undergo testing, zoning will be balanced, and you will receive instructions on how to operate the system effectively. While this may seem basic, many homeowners fail to receive proper guidance on how to use their new system, which can lead to confusion later on.

Estimating Replacement Costs: A Realistic Financial Overview

Cost estimates can fluctuate significantly based on your home’s size, the extent of ductwork modifications required, and the specific system you choose. However, here’s a realistic price range for Melbourne in 2026.

• Gas ducted heater replacement (reusing existing ducts): Expect prices to start around £4,500 and can go up to £7,000 for installation, depending on the unit size and brand.
• Ducted reverse cycle (full installation with new ductwork): Prices generally range from £10,000 to £18,000 or more for an average home in Melbourne. Larger homes, multiple zones, or challenging roof spaces will push costs higher.
• Ducted reverse cycle (using existing ductwork where possible): This can cost between £7,500 and £13,000. Not every gas duct layout is suitable for reuse, but when it is, it can lead to significant savings.
• VEU rebates can reduce costs by anywhere from £1,000 to £3,000 or more, depending on your system and individual circumstances. Your installer should assist with the rebate paperwork; if they cannot, it's worth questioning why.

These figures serve as general guidelines and may not reflect your unique situation. Each house is different. If you desire a precise estimate for your home, don't hesitate to contact us for a quote—Beyond Heating and Cooling provides this service free of charge.

Project Timeline: Understanding the Duration of the Entire Process

From your initial call to the moment your system is fully operational:

• Simple gas swap: Typically completed within a week or two after you accept the quote, with a one-day installation timeframe.
• Full reverse cycle changeover: Usually requires two to four weeks for lead time (including unit ordering and scheduling), followed by two to three days on-site for installation.
• Peak season (May–July): During these months, everything may take longer as many homeowners in Melbourne suddenly realise their heating systems are malfunctioning. If you are reading this in autumn, now is an excellent time to arrange your installation.

Essential Questions to Discuss with Your Installer

Not all installers are equal, and in this line of work, the quality of installation is as crucial as the equipment used. Here are some important questions to consider asking:

• Have you conducted a heat load calculation for my home? This should not be a guess but a precise calculation. Systems that are undersized won't effectively heat your home, while oversized systems waste energy by cycling on and off.
• Can I reuse my existing ductwork? This can vary. A reputable installer will provide a clear answer based on your specific situation.
• What brand and model are you quoting? It's essential to know exactly what you are getting rather than a vague reference like “a 14kW system.”
• What’s the warranty — on the unit and your installation work? It's vital to differentiate between the manufacturer's warranty and the warranty provided by the installer.
• Are you licensed to perform gas disconnections? If you are transitioning from gas, a licensed gas fitter must correctly disconnect your old unit. Not every HVAC company can perform this task—Beyond Heating and Cooling can, as our team holds gas fitting licenses in addition to HVAC qualifications.
• Will you manage the VEU rebate? You shouldn't have to chase paperwork; your installer should handle that for you.

Addressing Common Concerns: Your Frequently Asked Questions Answered

Do I need to replace my gas heater with an electric one?

No, there is no legal requirement mandating the removal of an existing gas ducted heater. You can opt to repair it or replace it with another gas unit. However, it is crucial to consider that Victoria’s energy policy is shifting towards electrification, so think about the long-term implications rather than solely focusing on the present situation.

Can I keep my gas cooktop if I switch my heating to electric?

Absolutely. Transitioning your heating to a reverse cycle system does not impact your gas cooktop, hot water system, or any other gas appliances. You can gradually electrify your home if desired, but there is no requirement to convert everything at once.

Is reverse cycle heating adequate for Melbourne winters?

Yes, modern ducted reverse cycle systems are designed to operate efficiently even at temperatures significantly lower than those typically experienced in Melbourne. The outdated belief that heat pumps struggle in cold weather stems from older models that lacked capability. Current systems perform well—even during those brisk 2°C mornings in July.

How can I determine if my ductwork is reusable?

A qualified installer must physically inspect your ductwork. They will evaluate size, condition (ensuring there are no significant leaks, tears, or collapsed sections), and whether the layout suits the new system. Metal ductwork in good condition can often be reused, while older flexible duct that has deteriorated typically requires replacement.

What happens to my old gas heater?

Your installer will remove and dispose of your old unit. A licensed gas fitter will properly cap off the gas supply to the unit, so you won’t need to arrange this separately.

Will a new system help reduce my energy bills?

It should, yes. Transitioning from a 20-year-old gas ducted heater operating at approximately 60–70% efficiency to a modern reverse cycle system with a Coefficient of Performance (COP) of 4 or better will significantly lower your running costs. The exact savings will depend on your home, usage patterns, and electricity rates, but most homeowners notice a substantial reduction.

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If you have an ageing gas ducted system and are uncertain about your next steps, connect with Beyond Heating and Cooling. They will assess your current setup and provide honest advice on whether it’s worthwhile to repair or replace—and what the best replacement option is for your home. No pressure, no obligation, just straightforward guidance on what makes the most sense for you.