Replacing Gas Ducted Heating: Key Tips for Melbourne 2026

If your gas ducted heater has significantly aged, typically around 15, 20, or even 25 years, you may have begun to notice various changes in its performance and efficiency. You might be experiencing longer wait times for your system to warm your home effectively. Additionally, an unexpected increase in your gas bills without any changes in your usage patterns may have caught your attention. Furthermore, the recent announcements regarding Victoria‘s shift away from gas systems may leave you contemplating how this transition will affect your situation moving forward.

Rest assured, you are not alone in navigating this challenge. Many homeowners in Melbourne are facing similar dilemmas, weighing the options of repairing their current systems, replacing them with new gas heaters, or transitioning to electric heating. With an abundance of information circulating, it is essential to clarify the current landscape and meticulously explore your options for a more sustainable future.

Exploring the Increase in Gas Ducted System Replacements: Key Factors to Consider

Several significant factors are converging at this critical juncture, influencing the decisions homeowners must make.

To start, a considerable number of gas ducted heaters that were installed in the early 2000s (and some even dating back to the 1990s) are nearing the end of their operational lifespan. These units were designed to function efficiently for approximately 15 to 20 years, and many have now surpassed that expected duration. As these systems age, it becomes increasingly difficult to source replacement parts, their overall efficiency diminishes, and often, it becomes more economically sensible to replace them rather than continue investing in repairs that may only offer temporary fixes.

Moreover, Victoria is actively promoting electrification as a key part of 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 direction towards a more electrified future. Additionally, incentives and rebates are increasingly favouring electric systems, while the costs associated with maintaining the gas network are rising, suggesting that your gas bills are likely to continue increasing in the foreseeable future.

Lastly, and perhaps most significantly, advancements in technology surrounding reverse cycle systems have been remarkable. A decade ago, ducted reverse cycle systems in Melbourne faced scepticism due to older models’ performance limitations in extreme cold. Fortunately, this perception has shifted dramatically; contemporary systems now handle the cold Melbourne winters efficiently, offering reliable heating without compromise.

Evaluating Your Choices: Balancing the Pros and Cons of Each Option

When your gas ducted heater exhibits signs of failure, you typically have three potential courses of action available to consider.

1. Consider Repairing Your Current Heating System

If your heating system is under 15 years old and the issue is relatively minor—for instance, a malfunctioning fan motor, ignition module, or thermostat—it may be worth contemplating a repair. This could involve a cost of a few hundred pounds and potentially extend the life of your unit for several more years. However, if you discover a cracked heat exchanger (which presents significant safety concerns beyond mere comfort) or if your unit has exceeded the 20-year mark, investing in repairs may lead to further complications in the long run. It is essential to be honest with yourself regarding your system's true condition and its remaining operational lifespan.

2. Upgrade to a New Gas Ducted Heating Unit

This option remains viable for many homeowners. Existing gas connections can continue to be operational—there is no immediate requirement to switch to electric heating. A new gas ducted heater will typically offer improved efficiency compared to your older model, and if your current ductwork is in good condition, you may be able to reuse it, helping to keep your costs manageable. However, it is vital to recognise that you would be investing in a system reliant on a fuel source that Victoria is progressively moving away from. The gas prices are unlikely to decrease, and prospective buyers will increasingly consider running costs when you eventually sell your property. While this choice may not be wrong for everyone, it is crucial to approach the decision with a thorough understanding of the long-term implications.

3. Transitioning to Ducted Reverse Cycle Electric Heating Systems

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

Navigating the Replacement Process: Detailed Step-by-Step Overview

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

• Initial Assessment: A qualified professional will visit your home to evaluate your current system, inspect the ductwork, measure the available space, and discuss your specific needs. Many installers mistakenly provide quotes based on rough estimates rather than thorough load calculations. If someone offers a quote without taking precise measurements, this should raise a red flag.
• Detailed Quote and Planning: You will receive a comprehensive written quote that outlines the unit, any necessary modifications to the ductwork, electrical work, and the gas disconnection process. This ensures that no surprises arise on the installation day.
• Installation Day(s): For a straightforward gas-to-gas swap where the existing ductwork is reusable, the process typically takes one day. If you are transitioning 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 advisable 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, leading to confusion later on.

Estimating Replacement Costs: A Comprehensive Overview

Cost estimates can vary significantly based on your home’s size, the extent of ductwork modifications needed, 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 increase costs.
• Ducted reverse cycle (using existing ductwork where feasible): 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 is 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, do not 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, here’s what to expect:

• 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, the timeline may extend 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.

Critical Questions to Discuss with Your Installer

Not all installers are equal, and in this field, the quality of the 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 have the option 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 affect 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 sufficient for Melbourne winters?

Yes, modern ducted reverse cycle systems are engineered to operate efficiently even at temperatures substantially 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 exceptionally well — even during those brisk 2°C mornings in July.

How can I ascertain if my ductwork is reusable?

A qualified installer must physically inspect your ductwork. They will assess 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 becomes of 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 observe a significant reduction.

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If you possess an ageing gas ducted system and are uncertain about your next steps, reach out to Beyond Heating and Cooling. They will evaluate 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.