Ducted heating ductwork replacement in Warragul

Ductwork replacement swaps the old flexible ducts that carry warm air from a ducted heater to each outlet, without necessarily replacing the heater. In Warragul it is worth pricing when the heater runs well but far rooms stay cold, outlets blow weakly, or the ducts in the roof or under the floor are torn, crushed or falling apart. If the ducts are sound and the heater is the problem, replacing only the heater usually costs less. Independent local providers inspect the ducts and quote, and the job is theirs from start to finish.

What are the signs your ducts need replacing?

• Rooms at the far end of the house never warm up, while rooms near the heater are fine.
• Airflow at some outlets is much weaker than at others.
• Dust or fibre blows out of the vents when the heater starts.
• The heater runs for long periods but the house does not reach the set temperature.
• You can hear air rushing in the roof or under the floor.
• In a roof or subfloor inspection, ducts are flattened, disconnected, torn or have loose insulation.

Some of these can also point to a heater fault, a blocked return air filter or closed zone dampers. A careful provider checks those first rather than quoting new ducts straight away.

Ducts only, or ducts and a new heater?

Situation	What usually makes sense	Why
Heater is sound, ducts crushed, leaking or undersized	Replace the ducts only	Keeps a working heater and fixes the airflow
Heater is failing, ducts in good condition	Replace the heater only	Reusing sound ducts is the biggest saving on a ducted job
Heater old and ducts poor	Price both together	One roof or subfloor job instead of two
Moving from gas ducted to reverse cycle	Inspect ducts before deciding	Reverse cycle may need a different size or layout
Adding rooms or outlets	New runs on the existing system, if the heater has capacity	The heater has to be able to supply the extra outlets

What’s The Damage advises that if the ductwork is sound, replacing just the heater unit usually costs less than a new system, so ask for that price separately. The heater side of the job is on the gas ducted heating page.

Can old gas heating ducts be reused for reverse cycle?

Sometimes. A ducted reverse cycle system pushes cool air in summer as well as warm air in winter, so the ducts need sound insulation to stop condensation forming on them in the roof. The system may also need different duct sizes or a different number of outlets than the old gas heater used. A provider should inspect the runs, measure the main ducts and check them against the new system’s requirements before telling you they can stay.

If the ducts were originally run for an evaporative cooler, they are often larger than a reverse cycle system needs. The ducted reverse cycle page covers the rest of that installation.

What does a careful provider check and what will they not skip?

1. Access. How to get into the roof or under the floor safely, and whether there is room to move along the duct runs.
2. The heater. Whether it has the capacity for the outlets you want, and whether it needs its own service. Energy Safe Victoria recommends all gas heaters, including central units, are serviced at least every two years by a qualified gasfitter (ESV gas heater safety).
3. Every run. Each duct from the heater to each outlet, looking for kinks, tight bends, sagging and loose joins.
4. Outlets and the return air grille. Whether the outlets are in the right place and the return air path is clear.
5. Old material. Removal and disposal of old ducting, which is often quoted as its own line.

A provider who quotes new ducts without going into the roof or subfloor is guessing. Expect an inspection before a firm price.

What does it cost to replace ducted heating ductwork?

The What’s The Damage 2026 Melbourne table puts whole house ductwork replacement, with new insulated flexible ducts supplied and installed, at $2,000 to $6,300, GST included. That figure covers ducts only, not a new heater. Warragul jobs may differ from Melbourne metro pricing.

Things that push the price up:

• A low or crowded roof cavity, which slows every run.
• Underfloor ducts with little crawl space.
• More outlets, or moving outlets to new positions.
• Removing and disposing of the old ducts.
• Zone dampers and controls.

For the other ducted figures, including new heaters, see the Warragul heating and cooling cost guide. When you know whether the ducts are in the roof or under the floor, you can ask for a duct replacement price.

How is the work done, step by step?

1. Inspection. The provider goes into the roof or subfloor, traces each run and notes which ducts can stay.
2. Plan. They confirm outlet positions, duct sizes and any new zones, then quote.
3. Heating off. On the day, the heater is switched off and isolated so nothing runs while ducts are disconnected.
4. Old ducts out. Failed runs are cut loose from the plenum and outlets and taken out through the access point.
5. New ducts in. Insulated flexible ducts are run with gentle bends, supported off the ceiling joists or floor bearers, and sealed and strapped at every join.
6. Outlets and testing. Outlets are refitted or replaced, then the heater runs while the provider checks airflow at each room.

Ask the provider how long your house will take. A tight roof or a shallow subfloor slows every run, and a house with many outlets takes longer than one with a handful.

Ceiling outlets or floor outlets: does it matter?

It changes the job more than most owners expect. With ceiling outlets the ducts lie across the ceiling joists in the roof space, where the provider can usually walk on boards or crawl along the joists. With floor outlets the ducts hang between the bearers under the house, and the work depends on how much clearance there is between the ground and the floor. Low clearance, damp ground or old debris under the floor all make the job slower.

Floor outlets also collect dust, small toys and pet hair, and a heavy item dropped through a grille can tear the duct below. If you have floor outlets, lift a grille and look inside with a torch before you enquire. A photo of what you see helps the provider plan.

Some homes have a mix, often because an extension was added with ceiling outlets while the original house kept floor outlets. Mention it if yours does.

What should you photograph for the enquiry?

Only take photos if you can do it safely. Do not crawl into a roof or subfloor you are unsure of.

• The heater data plate, showing brand, model and age if listed.
• The roof manhole or subfloor access point, with something for scale.
• Any ducts you can see from the access point, especially crushed or torn sections.
• The outlets in the rooms that do not warm up.
• The return air grille and its filter.

Is there a local angle in Warragul?

Warragul has a mix of older homes near the town centre and newer estates on the edges, and both can have ducted gas heating with ducts in the roof or under the floor. Homes with a raised timber floor often have ducts underneath, where they can be crushed or pulled loose over time. Tell the provider whether your outlets are in the floor or the ceiling, because it changes how the job is done. The Warragul area page has more on local homes and enquiries.

Next step: tell a provider where your ducts run

To send a ductwork replacement enquiry, include:

• Your suburb and whether the outlets are in the floor or the ceiling.
• The heater brand, model and approximate age, and whether it still runs well.
• Which rooms stay cold or have weak airflow.
• Photos of the access point, any visible ducts and the heater data plate.
• Whether you are thinking about switching to reverse cycle, so the ducts can be checked for reuse.

Send a job enquiry