Replacing Gas Ducted Heating: Essential Tips for 2026 Melbourne

If your gas ducted heater has reached an advanced age — specifically 15, 20, or even 25 years — you may have started to notice several concerning changes. For instance, you might find that it takes considerably longer to warm your home effectively. Additionally, you may have observed an unexpected increase in your gas bills without any changes to your usage patterns. Furthermore, the transition away from gas systems in Victoria is a hot topic, leading to questions about what this shift means for your heating situation.

Rest assured, you are not alone in facing this challenge. Numerous homeowners in Melbourne find themselves deliberating whether to repair their existing systems, replace them with another gas heater, or switch to electric heating. The abundance of information available can be overwhelming, so it is essential to clarify the current landscape and your available options moving forward.

Understanding the Factors Leading to Increased Gas Ducted System Replacements

Several crucial factors are converging at this moment in time, influencing the decision to replace gas ducted heaters.

To begin with, a substantial number of gas ducted heaters installed during the early 2000s (and even some from the 1990s) are now reaching the end of their operational lifespan. These units were specifically designed to last between 15 to 20 years, and many have already surpassed this critical threshold. With age, sourcing replacement parts becomes increasingly difficult, the efficiency of the system declines, and ultimately, it becomes more cost-effective to replace the unit rather than continue investing in repairs.

Moreover, Victoria is actively promoting electrification of home heating systems. Starting January 2024, the state government will prohibit new gas connections in newly constructed homes. While this does not require the immediate removal of your existing gas system, it does signal a clear and deliberate direction towards more sustainable heating solutions. Incentives and rebates are increasingly favouring electric systems, while the maintenance costs associated with the gas network escalate, indicating that your gas bills will likely continue to rise.

Lastly, and most importantly, the technology behind reverse cycle systems has significantly advanced. A decade ago, a ducted reverse cycle system in Melbourne might have been met with scepticism, as older models often struggled to perform adequately in severe cold conditions. Thankfully, this perception has shifted; modern systems now efficiently handle the chill of Melbourne winters without any issues.

Weighing Your Options: Benefits and Drawbacks of Each Heating Solution

When your gas ducted heater begins to show signs of failure, you typically have three primary options to consider.

1. Repairing Your Current Heating System

If your heating system is less than 15 years old and the issue is relatively minor — perhaps a faulty fan motor, ignition module, or thermostat — it may be worthwhile to pursue repairs. This could cost a few hundred dollars and potentially extend the lifespan of your unit for several additional years. However, if you discover a cracked heat exchanger (which presents a significant safety concern, not just a comfort issue) or if your unit has exceeded the 20-year mark, investing in repairs might lead to further complications and expenses down the line. Be honest with yourself regarding your system's true condition and remaining lifespan.

2. Investing in a New Gas Ducted Heating Unit

Indeed, this remains a viable option. Existing gas connections are permitted to remain operational — there is no immediate requirement to transition to electric heating. A new gas ducted heater will generally offer improved efficiency compared to your older model, and if your current ductwork is in good condition, you might have the opportunity to reuse it, which can help keep installation costs manageable. However, it is crucial to recognise that you are investing in a system that relies on a fuel source that Victoria is gradually moving away from. Gas prices are unlikely to decrease, and prospective buyers may increasingly consider the running costs when you eventually sell your home. While this may not be the wrong choice for everyone, it is essential to approach this decision with full awareness of its long-term implications.

3. Transitioning to Ducted Reverse Cycle Electric Heating

This is the path that most homeowners are inclined to pursue by 2026, and for good reason. A ducted reverse cycle system provides both heating and cooling capabilities from a single unit. This allows you to reduce your dependence on gas (or at least minimise your reliance on it for heating), lower your overall running costs, and take advantage of Victorian Energy Upgrades (VEU) rebates, which can significantly offset your installation expenses. The primary downside is that the initial investment for this system is usually higher than simply replacing with another gas unit, especially if your existing ductwork requires alterations or replacement. Nevertheless, when factoring in the rebates, reduced ongoing costs, and the dual functionality of heating and cooling, the financial equation typically becomes favourable over a period of five to seven years.

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

Many individuals seek clarity regarding what to expect during the replacement procedure; therefore, here is a general overview of the process.

• Initial Assessment: A qualified professional will visit your home to evaluate your current system, inspect the ductwork, measure the available space, and have a consultation with you about your specific heating needs. Many installers make the error of providing quotes based on rough estimates rather than conducting thorough load calculations. If an installer quotes without taking proper measurements, consider that a significant warning sign.
• 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 process for gas disconnection. This approach ensures that no unexpected surprises arise on the day of installation.
• Installation Day(s): For a straightforward gas-to-gas replacement where the existing ductwork is reusable, the entire 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 time, so it is advisable not to schedule the installation 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 utilise their new system, which can lead to confusion later.

Assessing Replacement Costs: A Realistic Financial Overview

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

• Gas ducted heater replacement (reusing existing ducts): Expect prices to start around £4,500 and can reach 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, those requiring multiple zones, or those with challenging roof spaces will likely incur higher costs.
• 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 is worth questioning why.

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

Project Timeline: Understanding How Long the Entire Process Will Take

From the moment you make your first call to the time 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, 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.

Key Questions to Ask Your Installer for an Informed Decision

Not all installers are created equal, and in this field, the quality of installation is as crucial as the equipment itself. Here are some important questions to consider asking your potential installer:

• Have you conducted a heat load calculation for my home? This should not be an estimate but an actual calculation. Systems that are undersized won't effectively heat your home, while oversized systems waste energy by cycling on and off unnecessarily.
• Can I reuse my existing ductwork? This can vary greatly. A reputable installer will provide a clear answer based on your specific circumstances.
• What brand and model are you quoting? Knowing the exact specifications is essential rather than receiving a vague reference such as “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, ensuring you have adequate protection.
• Are you licensed to perform gas disconnections? If you are transitioning from gas, a licensed gas fitter must properly 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 should not have to chase down paperwork; your installer should handle that for you, ensuring you receive all applicable benefits.

Addressing Your Concerns: Answers to Frequently Asked Questions

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

No, there is currently no law 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 you should weigh the long-term implications rather than focus solely on the immediate situation.

Can I maintain 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 all at once.

Is reverse cycle heating sufficient for Melbourne winters?

Yes, modern ducted reverse cycle systems are designed to operate efficiently even in temperatures that are significantly lower than those typically experienced in Melbourne. The outdated notion that heat pumps struggle in cold weather stems from older models that lacked the necessary capability. Current systems perform exceptionally 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 assess the size, condition (ensuring there are no significant leaks, tears, or collapsed sections), and whether the layout is suitable for 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 responsibly 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 make separate arrangements for this.

Will a new system help lower my energy bills?

It should, yes. Transitioning from a 20-year-old gas ducted heater operating at around 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 marked reduction in their bills.

If you have an ageing gas ducted system and are uncertain about your next steps, reach out to Beyond Heating and Cooling. They will assess your current setup and provide honest, no-pressure advice on whether it’s worth repairing or replacing — and what the best replacement option is for your home. You will receive straightforward guidance tailored to your situation.