How to choose the best air duct cleaning company for your home

The best air duct cleaning company for your home is one that puts the whole system under suction with a truck-mounted or industrial vacuum, seals the vents, cleans the trunks and the furnace blower, photographs the ducts before and after, quotes one all-in price by home size, and can be found on a certification directory under the same name and phone number it gave you. The "$99 whole-house" offer fails every one of those tests, and knowing why is most of what you need to choose well.

Why the choice of company matters

Duct cleaning is a mechanical service done inside the part of your house you cannot see. A crew connects a vacuum to the furnace plenum, opens the trunk lines, pushes compressed air and brushes through every branch, and works inside the furnace cabinet around the blower. Done badly, it moves settled dust out of the ducts and into your bedrooms, scratches a coil, or leaves open holes in the trunk covered with tape.

The cheapest version of the job is not a lesser version of the same thing. It is a different activity. An operator who vacuums at each register with a portable unit, with nothing drawing on the trunk, disturbs the dust in the branch without removing it. That is the "blow-and-go" model, and the US EPA's advice on choosing a provider is a useful filter against it: talk to at least three providers, get written estimates, avoid anyone who makes sweeping health claims or recommends cleaning as a routine part of maintenance, and get a written agreement on cost and scope before work starts (EPA, Should You Have the Air Ducts in Your Home Cleaned?).

The "$99 whole-house" offer

Homeowners across Toronto, Mississauga and Brampton see the same flyer, text message or marketplace ad: whole-house duct cleaning for $99, sometimes $49. NADCA's consumer site describes the pattern plainly: blow-and-go companies advertise low prices but deliver minimal cleaning, push extra services that may not be needed, and claim mould or hazards exist without a proper inspection (Breathing Clean, Avoid Scams). The sequence usually runs like this:

1. The price gets them in the door. $99 does not cover two technicians, a truck and an hour and a half. It covers a van and a portable vacuum for 45 minutes.
2. The real bill is built on site. Supply vents, return vents, the furnace drop and the "main line" are each announced as extra once the crew is in the basement. A per-vent add-on across a typical house turns $99 into several hundred dollars.
3. The scare. A dirty swab or a photo of something dark is presented as "black mould" and a disinfecting treatment is offered on the spot. The EPA is clear that whether something is mould can only be determined by an expert, and that no products are registered by EPA as biocides for fibreglass-lined ducts.
4. The result. Dust is stirred up and partly blown into the rooms, the trunk and blower are untouched, and the homeowner concludes duct cleaning does not work.

Our guide to avoiding duct cleaning scams in the GTA covers these tactics in more detail.

Red flags

• A price well below the cost of doing the work. For context, our house cleaning starts at $399 before HST and includes every vent, the trunks and the furnace. A whole-house offer at a quarter of that is not a bargain; it is a different service.
• Per-vent or per-hookup pricing. Any quote that does not already include every supply, every return and the main trunk connections will grow on the day.
• A shop vacuum, or no vacuum on the trunk. If nothing is pulling on the main line while the branches are agitated, the loosened dust has nowhere to go but the room.
• Mould diagnosed by eye in your basement. With a treatment priced on the spot.
• No photos. A company that will not show you the inside of your ducts before and after is asking for trust it has not earned.
• Holes patched with foil tape. Access openings cut into trunks should be closed with a proper plate that stays sealed.
• No insurance or WCB coverage offered when asked. A crew working inside your furnace and on your ceilings should be insured, and you should not have to argue to see proof.
• A certification claim you cannot find in a directory. Both CNADCA and NADCA warn about companies using their names without holding membership.

Professional source removal versus blow-and-go

The vetting checklist

Ask these over the phone before booking anyone, including us. Straight answers are the point; hesitation on any of them is your answer.

1. Does the price include every supply vent, every return vent and the main trunk connections? Get the figure in writing with HST stated separately.
2. What vacuum will be on my system, and where does it connect? For a house, the answer should be a truck-mounted or industrial unit connected at the main trunks or plenum.
3. Do you seal the vents while you work?
4. Do you clean the blower and the furnace base, or only the ducts? This is the step cheap services skip, and it is where the finest dust ends up.
5. Do you take before-and-after photos, and will I receive them?
6. How do you close the access openings you cut?
7. If you find mould or evidence of pests, what happens? The right answer is that they show you, explain what they can and cannot determine, and do not sell you a treatment on the spot. The EPA recommends against sealants in ducts except in unusual circumstances, and notes that biocides have not been shown to work well inside ducts.
8. Are you insured, and do you have WCB coverage?
9. Who certifies you, and what is your company ID? Then check it, which is the next section.

Compare the answers against our 12-step process, which is the standard we hold ourselves to on every house.

How to verify certification

There is no government licence for duct cleaning in Ontario. "Certified" means an industry association has checked the company, and the only way to know whether that is true is the association's directory, not the company's website or van.

• CNADCA (the Canadian National Air Duct Cleaning Association, a federally incorporated non-profit) lists its certified companies by province at cnadca.com/member-directory. Open the company's profile to see its ID, certification and renewal dates, whether its licence, insurance and WCB clearance are recorded as valid, and the technicians certified under it. Air Force Shield is CNADCA certified (company ID CA-00153); our profile is at cnadca.com/certified-companies/air-force-shield.
• NADCA (the US-based National Air Duct Cleaners Association, publisher of the ACR standard) lists its member companies at nadca.com/find-a-professional. Set the country to Canada and search your city; each listing shows the membership date and the number of certified personnel.

Match the name, phone number and website on the profile to the quote in your hand. For what each certification actually checks and what it does not guarantee, read what "certified duct cleaner" means in Canada.

What a fair price looks like

A fair quote is one number for your home, with HST separate, that does not change when the crew arrives. We price by size rather than by vent. For a house with one furnace: under 2,000 sq ft $399; 2,001 to 3,000 sq ft $449; 3,001 to 4,000 sq ft $499; over 4,000 sq ft quoted by phone. Each additional furnace is $200, up to three. A condo is a flat $399 for a single unit or $599 for a double, including the vents, the fan coil or wall unit, the bathroom exhaust fans and the dryer vent. Add-ons for a house, at $90 each, are the dryer vent, the heat recovery ventilator, the humidifier and a set of three bathroom or laundry exhausts; book two add-ons and the third is free. Repeat clients get 5 percent off the cleaning. Prices are in CAD before HST, and the full breakdown is on our duct cleaning cost page.

Every job is covered by our "love it or don't pay" guarantee. If you want a quote you can check against a directory listing and a published price list, request one here.

Frequently Asked Questions

Is a $99 whole-house duct cleaning ever legitimate?

Not as a complete cleaning. The figure does not cover a crew, a truck-mounted vacuum and an hour and a half on site. It is a door-opener for per-vent charges and on-the-spot mould treatments. A real whole-house price in the GTA starts in the hundreds and includes every vent, the trunks and the furnace.

How long should a professional duct cleaning take?

About 1.5 hours for a house, depending on size and the number of furnaces. About 45 minutes for a condo. A house finished in 45 minutes has had its registers vacuumed, not its system cleaned.

How do I check whether a duct cleaner is really certified?

Look them up on the association's own directory. CNADCA lists certified Canadian companies by province with their ID and renewal dates; NADCA's Find a Professional directory lists member companies by city. Confirm the name and phone number match your quote.

Are chemical treatments or foggers necessary?

Rarely. The EPA advises against sealants except in unusual circumstances and notes that biocides have not been shown to work well in ducts. We apply Benefect, a botanical disinfectant, as a standard step after cleaning, and we do not sell mould treatments on the spot.

What should a written quote include?

One all-in price for your home size with HST shown separately, a statement that all supply and return vents and the main trunks are included, whether the blower and furnace base are cleaned, that before-and-after photos are provided, and the company's certification ID so you can look it up.