Duct Cleaning Cost in the GTA (2026): What It Costs and When You Actually Need It
Real prices by vent count, what the $99 offer really buys, and the three conditions that actually justify the job.
In short
A full duct cleaning in Toronto and the GTA runs $290 to $700, depending on how many vents you have. City Duct Cleaning publishes $290 for the first ten vents and $9 for each one after; other shops charge $28 to $45 per vent, which puts a typical 15–20 vent house at $375 to $650. A real job takes three to five hours.
The part nobody selling it will tell you: the US Environmental Protection Agency — the authority these companies like to invoke — writes that duct cleaning has never been shown to prevent health problems, and advises against hiring anyone who sells it as routine maintenance. There are three specific conditions where it is worth doing, and they are listed below.
Key facts
| Typical GTA price | $290–$700 for a whole house |
| Per-vent pricing | $28–$45, or a base price plus $9–$13 per extra vent |
| How long a real job takes | 3–5 hours |
| How long the cheap version takes | 60–90 minutes |
| EPA position | Not recommended routinely — only as needed |
| Conditions that justify it | Visible mould, vermin, or debris actually blowing out of registers |
| Enforcement on record | The CRTC fined nine GTA duct cleaning companies a combined $149,000 in 2015 over illegal telemarketing |
How much does duct cleaning cost in the GTA?
Between $290 and $700 for a detached house, and the number that matters is vents, not square feet. Count your supply registers and return grilles before you call anyone — it takes two minutes and it is the only way to check a quote.
| What you are paying for | Price |
|---|---|
| Base package, first 10 vents | From $290 (City Duct Cleaning, published) |
| Each additional vent | $9–$13 |
| Straight per-vent pricing | $28–$45 per vent |
| Typical 15–20 vent house | $375–$650 |
| Large or multi-zone home | Up to $700 |
| Furnace cleaning bundled in | $350–$600 combined, usually less than booking separately |
Ask what counts as a vent. Some companies count only supply registers and treat the returns — the big grilles that pull air back — as extras. The returns are the dirtier half of the system.
What does the $99 offer actually buy?
Ninety to a hundred and twenty minutes, a hose down a handful of registers, and a conversation in your basement.
The economics say so plainly. A job done to the industry standard means opening access ports, putting the whole system under negative pressure, brushing duct surfaces, and cleaning the furnace, the coil and the blower — three to five hours of two people’s time and a truck-mounted vacuum. Nobody sells that for $99. The advertised price is the cost of getting a technician through your door.
What happens next is documented. The pattern reported across Ontario is that the cheap visit turns up a problem — mould, contamination, a return system that was not included — and the final invoice lands several hundred to a couple of thousand dollars higher. A common version is cleaning the supply side, then showing you how dirty the returns are and charging again to do those.
This is not folklore. In March 2015 the CRTC named nine Greater Toronto Area duct cleaning companies in a telemarketing investigation and issued $149,000 in penalties — four paid $55,000 between them, five more were on notice for $94,000. The companies were using offshore call centres that ignored Canada’s Do Not Call List. The Canadian Anti-Fraud Centre lists the low-price duct cleaning call as a recognised pattern: cheap offer by phone, upsell once inside.
Does duct cleaning improve your health?
No one has shown that it does. The EPA’s guidance, last reviewed in February 2026, puts it in one sentence: duct cleaning has never been shown to actually prevent health problems. Studies do not show that dust levels in homes go up because of dirty ducts or come down after cleaning, because most of what settles inside ducts sticks to the metal rather than travelling into your rooms.
The same guidance is blunt about sales tactics. It tells consumers not to hire duct cleaners who make sweeping claims about health benefits, because such claims are unsubstantiated, and not to hire anyone who recommends duct cleaning as a routine part of maintenance. It also warns against companies claiming to be “EPA certified” — the EPA neither sets duct cleaning standards nor certifies any company.
None of which makes the job harmful. The EPA is equally clear that where cleaning is done properly, there is no evidence it does damage. The honest summary is that it is a legitimate service that is routinely sold for the wrong reason.
When is duct cleaning actually worth it?
The EPA names three conditions, and they are all things you can see or smell:
There is a fourth reason that has nothing to do with air quality: renovation. Drywall dust gets everywhere, and if the system ran during construction, the ducts hold it.
One thing worth knowing about all three. If the cause is not fixed, the problem returns — mould grows back if the moisture that fed it is still there. Cleaning treats the symptom.
How do you know if they found real mould?
Ask them to show you. The EPA makes this the first test, and adds two details that are easy to use.
First, a substance that looks like mould may not be. A positive identification takes an expert, and often a lab — for roughly $50 a microbiology lab can test a sample lifted on a strip of clear sticky tape. Second, if a technician demonstrates contamination by growing something on a petri dish, the EPA’s word for that is inappropriate. Some microorganisms are always in the air of every home, and growth on a settling plate is normal. It proves nothing about your ducts.
If the mould is real and it is on fibreglass duct liner rather than bare metal, cleaning will not fix it. The EPA, the duct cleaning association NADCA and the insulation manufacturers’ association all say wet or mouldy fibreglass has to be removed and replaced.
What should a proper job include?
A quick verification the EPA suggests and which costs nothing: shine a flashlight at one side of the cooling coil. If the coil is clean, light comes through the other side.
Red flags
What to do next
Before you book anything, go and look. Pull one floor register, take a photo down the duct with your phone’s flash, and look at the return grille. If you see a normal grey film, you have the light household dust the EPA says poses no known risk. If you see matted debris, something growing, or evidence of animals, you have a reason.
If you do have a reason, get three written estimates — the EPA’s own advice — and ask each one what is included, how many vents are covered, how long they will be on site, and whether the furnace and coil are in the price. Compare home services in Ontario on Ontario24 and contact companies directly. Ontario24 is a classified directory: we help you find and compare businesses, and we do not vet them, so check credentials and references yourself — our safety tips cover how.
If what you actually want is a system that runs well this winter, the higher-value spend is usually elsewhere: our furnace cost guide covers the annual inspection the EPA does recommend before every heating season, and our AC guide covers the coil, which is the component research actually links to efficiency.
Before you call anyone, it helps to know what this job should cost and what the next one will. What things cost in Ontario in 2026 puts 75 service prices in one table.
Frequently asked questions
$290 to $700 for a whole house, priced by the number of vents rather than floor area. One Toronto company publishes $290 for the first ten vents plus $9 each after that; others charge $28 to $45 per vent. A typical house with 15 to 20 vents lands between $375 and $650.
It is a price that cannot cover the work. A cleaning done to standard takes three to five hours and covers the furnace, coil and blower as well as the ducts. The $99 visit typically lasts 60 to 90 minutes and ends with additional charges. In 2015 the CRTC penalised nine GTA duct cleaning firms $149,000 over illegal telemarketing.
There is no evidence that it does. The EPA states that duct cleaning has never been shown to prevent health problems, and that studies do not show particle levels falling after cleaning. It advises against hiring companies that make health claims. If someone in the house has unexplained symptoms, the EPA suggests speaking to a doctor first.
The EPA does not recommend cleaning on a schedule at all — only when there is visible mould, a vermin infestation, or debris being blown into rooms. Routine maintenance means changing filters and having a fuel-burning furnace inspected before each heating season, which the EPA does recommend.
Only with care. No biocide is registered for use on fibreglass duct board or fibreglass-lined ducts, so the first question is what your ducts are made of. On bare sheet metal some products are registered. The EPA says biocides should be applied only after proper cleaning, only where growth has been demonstrated, and strictly to label directions.
Ask them to show you where it is and photograph it. A lookalike substance cannot be told from mould by eye; a microbiology lab can test a tape sample for around $50. If a technician offers a petri dish as proof, the EPA calls that demonstration inappropriate, because some microorganisms are present in all indoor air.
Probably not by itself. Research suggests cleaning the coils, fans and heat exchanger can improve system efficiency, but the EPA notes there is little evidence that cleaning the ducts alone does. If efficiency is the goal, the furnace and coil are where the money goes.
Sources
Guidance on when duct cleaning is warranted, on health claims, on biocides and sealants, and the post-cleaning checks in this article come from the US Environmental Protection Agency’s “Should You Have the Air Ducts in Your Home Cleaned?”, last updated 19 February 2026. The telemarketing penalties were announced by the Canadian Radio-television and Telecommunications Commission in March 2015. GTA prices were taken from companies’ own published price lists and checked on 16 September 2026; pricing changes without notice, so confirm before booking. Ontario24 is a classified directory and does not provide duct cleaning, inspect systems or assess mould. This article is general information, not a diagnosis of your home.