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A smell from the vents usually means something is sitting in the ducts: dust, pet dander, old smoke or moisture. Spraying a fragrance into dirty ducts only covers it up for a while. We clean the ducts first, with rotary brushes and HEPA-filtered negative-air extraction, and then apply a sanitising and deodorising treatment through the clean system. You get before and after photos of the ducts, so you can see what came out.
Any one of these is worth a call. They rarely fix themselves.
A sanitising or deodorising treatment works on the duct surfaces it can reach. If those surfaces are coated in dust, hair and old residue, the treatment sits on top of the dirt and the smell returns. That is why sanitising without a mechanical clean first is a red flag. Every treatment we apply follows a full clean: each duct brushed, the loosened dust drawn out with HEPA-filtered negative-air extraction, the vents removed and cleaned, and the return air cleaned. Our air duct cleaning page explains the clean in full.
Dust and dander. The return air draws the same household dust and pet hair through the system again and again, and some of it settles in the ducts. Smoke. Smoke residue clings to duct walls and comes back each time air moves. Moisture. A damp roof space, a leak or an evaporative system that sat wet can leave a musty smell. Pests. Rodent or bird activity in a roof can reach the ducts. The clean removes the material holding the smell, and the treatment freshens what is left. Our guide to return air vents explains why the return matters so much.
It freshens a clean system and treats the duct surfaces after cleaning. It does not fix a source that is still there. If the roof space is still damp, or a duct is split and drawing in roof air, the smell will come back until that is fixed. If we find a damaged duct during the clean, we photograph it and quote the repair through our duct repair and replacement service. Visible mould on ceilings or walls is a separate job for our mould remediation team, and our mould and moisture guides explain the causes.
The treatment works the same way whether the vents are in the ceiling or the floor, and on ducted heating, ducted reverse cycle and evaporative systems. We clean ceiling ducts, floor ducts and the return air duct in the same visit, then treat the whole system.
A clean and treatment is a common first job in a home you have just bought or rented, especially if the previous owners smoked or had pets. Landlords and property managers book it between tenants, see rental property duct cleaning. After building work, fine renovation dust settles in the ducts, and our post-renovation duct cleaning page covers that clean.
10,000+ projects for homes, councils, universities & agencies
Brands we service — heating, cooling & fireplaces
The treatment is always applied after a full duct clean. Repairs to damaged ducts are quoted separately and only go ahead once you approve them.
What it smells like, when it is worst, and what system you have.
The office quotes the clean and treatment together and books a time, 7 days a week.
Every duct cleaned and extracted, then the treatment applied, with photos.
Go through the photos with the technician. You pay once the job is finished.
Real reviews from verified FreshDuct customers — find hundreds more on our Google profile.
Rated 5 out of 5 stars
“Cannot say enough about Gabriel and his team. They were very professional with their job. He taught me what I am supposed to know about vents and how to take care of them. They did an amazing job.”
Rated 5 out of 5 stars
“Our ducts had not been cleaned in 9 years. I was really happy with their professionalism and speed. They respected our house rules and the air in my home is really fresh and clean.”
Rated 5 out of 5 stars
“Outstanding service! Manny was very professional and polite. This is by far the most thorough cleanup that we have experienced. All vents were cleaned and sanitised.”
Rated 5 out of 5 stars
“Adam and his team were professional and very service oriented. They provided detailed before and after pictures to confirm the work and effort. Highly recommend FreshDuct.”
Rated 5 out of 5 stars
“Tom and Eddie did an outstanding job cleaning my air ducts. I scheduled my appointment yesterday and the job was completed within 24 hours. Very satisfied with the service.”
Rated 5 out of 5 stars
“We had pet stains and a bad smell in the carpet and air ducts. After FreshDuct visited, the house smells fresh and clean again.”
Rated 5 out of 5 stars
“Our house flooded in the storms with over a metre of water. FreshDuct came recommended by our neighbours and arrived the same day.”
Rated 5 out of 5 stars
“They were clear up front about pricing and exactly what was included. Very thorough from start to finish.”
Branded vans, uniformed technicians, professional equipment — the team your neighbours already know.
No. A treatment on top of dust and residue does not last, and the smell comes back. We always clean the ducts first, then apply the treatment to the clean surfaces.
It is added to a duct clean, and ducts are from $299 per system. The office quotes the treatment with the clean before booking, so you know the full price first. There is no call-out fee, and you pay after the job.
Cleaning removes the dander, hair and residue that hold the smell, and the treatment freshens what is left. If the smell is also in carpets, curtains or walls, those need cleaning too, because the ducts are only one part of the house.
A musty smell often means dust and moisture have sat in the ducts. If you can see mould on ceilings or around vents, the cause needs to be found and treated, and our mould remediation team handles that. The clean and treatment then freshen the ducts.
The treatment is applied through the system after cleaning, and the technician will tell you how long to keep the system off and the rooms aired. Ask the office if you have specific concerns, for example a newborn or a pet bird.
Yes. Evaporative ducts can pick up a musty smell after a wet period, and they are cleaned and treated the same way.
It depends on what caused the smell. When the source has been cleaned out and nothing new is getting in, the system stays fresh far longer than a treatment on its own.
Duct sanitising Melbourne
FreshDuct sanitises ducted heating, ducted reverse cycle and evaporative cooling ducts across metropolitan Melbourne, always after a full duct clean, 7 days a week.
Duct deodorising
Stale, musty, pet and smoke smells from the vents are tackled at the source by cleaning, then freshened with a deodorising treatment.
Clean air from every vent
Ceiling ducts, floor ducts and the return air are cleaned in one visit, with before and after photos on every job.
All of metropolitan Melbourne, 7 days a week — and if your suburb is not listed, we still come to you. The office confirms the details for your address when they call with your free estimate.
Tell us what the smell is and what system you have. We clean first, then treat. No call-out fee, and you pay after the job.
FreshDuct
