What does a ductwork and duct cleaning visit include?
Best HVAC Toronto is a TSSA-certified HVAC contractor that has served Toronto and the GTA since 2005. Our technicians design, install, clean, repair, and balance residential and commercial ductwork, and clear dryer vents to prevent lint fires, in everything from Etobicoke bungalows and Leslieville semis to Markham detached homes, stacked townhouses, and commercial units. Residential duct cleaning is the most common request; commercial duct cleaning for restaurants, offices, and warehouses runs on its own schedule outside business hours. The duct system is the part of a heating and cooling installation that homeowners think about least and that determines comfort most. You can install excellent equipment and still have a cold basement and a hot upstairs if the distribution is wrong.
We will also be direct about duct cleaning, because it is the most oversold service in this industry. Cleaning genuinely helps after renovation or construction work, after a rodent or insect problem, where there is visible debris or biological growth at the registers, and when a home has been vacant. In a well-maintained house with a decent filter and no visible contamination, the measurable benefit is small, and a filtration or ventilation upgrade usually does more for indoor air quality than repeat cleaning. We inspect the runs before quoting and tell you which situation you are actually in.
Where we can nearly always help is airflow. If a room never reaches temperature, the usual cause is distribution rather than furnace capacity. We measure static pressure across the air handler and airflow in CFM at each register, which turns an argument about equipment size into a specific, fixable finding.
What is included in a duct cleaning
Inspection and photographs of the runs, rotary brush agitation with a negative-pressure vacuum on the trunk, cleaning of all accessible supply and return runs, register and grille cleaning, furnace blower compartment cleaning, filter replacement, and post-work airflow verification.
What ductwork problems do older Toronto homes have?
Not enough return air
The most common fault in post-war Toronto housing. Many Scarborough and North York bungalows were built with one central return, and when the basement was finished years later, nobody added another. Air cannot get back to the furnace, so it cannot be delivered either. Look for doors that drift shut, whistling under closed doors, and rooms that never quite reach temperature.
Long, undersized, or crushed runs
Flexible duct pinched behind a joist, a run stretched to the far corner of an addition, or a takeoff that was never sized for the room it serves. All produce the same result: not enough air arriving where it is needed.
Unsealed joints in unconditioned space
Ductwork in an attic, garage, or crawlspace leaks heated and cooled air into spaces you are not trying to condition. Sealing accessible joints with mastic is cheap and effective.
Ductwork never rebalanced after a renovation
Finishing a basement, adding a second floor, or converting an attic changes the heating and cooling load of the house. Systems that were balanced correctly in 1975 are rarely still balanced today.
Dryer vents packed with lint
A separate issue but one we are asked about constantly. A restricted dryer vent makes the appliance run far longer than it should and is a genuine fire risk. If clothes need two cycles, check the vent before blaming the dryer.
How much does duct cleaning cost in Toronto?
For cleaning, the drivers are the number of supply and return runs, the size of the home, and access. A compact East York semi with eight runs sits at the lower end of the 2026 range of $400 to $800; a large Vaughan home with twenty runs across three levels sits at the upper end. Pricing is the same whether you are in downtown Toronto, Mississauga, or Brampton, and the Best HVAC Toronto crew dispatches across the GTA, so the duct cleaning crew near you works from the same written rate card. Commercial duct cleaning is quoted per building after a walk-through, because the number of air handlers, the duct sizes, and after-hours access vary far more than they do in houses.
For ductwork modification, the cost depends on how much needs changing and how accessible it is. Adding a return in an unfinished basement is straightforward. Running a new supply to a finished attic bedroom means opening and repairing finished surfaces, which is the larger part of the cost. New trunk runs for an addition are quoted per project after a load calculation.
For diagnostics, we would rather charge for an airflow survey and give you a specific answer than sell equipment that does not address the cause. Where duct correction turns out to be unnecessary, we will say so, and that visit will have saved you the price of a furnace you did not need.
How often should you clean your air ducts?
The industry recommendation from the National Air Duct Cleaners Association (NADCA) is duct cleaning every three to five years for average residential homes, with more frequent cleaning for specific triggers. Reasons to clean sooner: recent renovation work that generated construction dust drawn into the ductwork, moving into a new-to-you home with unknown maintenance history, visible dust discharge from supply registers within seconds of the blower starting, allergy or asthma flare-ups tied to seasonal HVAC operation, pets that shed heavily and coat return grilles with hair and dander, or evidence of pest activity (droppings on registers, unusual smells from vents).
Reasons cleaning does not need to happen: no visible dust discharge from supply registers, no allergy or health issues tied to the HVAC system, and a home that has been well-maintained with regular filter replacement. Filter replacement is more important than duct cleaning for ongoing air quality; a good MERV 11 filter changed quarterly keeps most of the debris out of the ductwork in the first place. Duct cleaning is a periodic reset, not a substitute for filter discipline. Cleaning cost typically runs $400-$800 for a full residential system including supply and return ducts, blower housing, and cabinet. Dryer vent cleaning (separate from HVAC duct cleaning) is typically recommended annually and runs $150-$300 for a standard residential run.
How dryer vent cleaning prevents lint fires
Dryer vents accumulate lint faster than most homeowners realise. Even with a lint trap catching most fabric fibres, fine lint bypasses the trap and coats the interior of the exhaust vent between the dryer and the outside termination. Fire services across Ontario regularly name lint build-up as a leading cause of clothes dryer fires: when the vent is restricted, airflow drops, the heating element runs hotter, and lint sitting near it can ignite.
The warning signs that dryer vent cleaning is overdue: clothes take longer than one cycle to dry (typically an extra 15-30 minutes on the same load), the dryer body feels excessively hot to the touch during operation, a burning smell during the dry cycle, or lint visibly puffing out around the door seal. Any of these means the vent is restricted and the dryer is running hot enough to ignite lint. Annual cleaning is the recommendation for standard residential dryers with vent runs under 25 feet. Homes with long vent runs, multiple 90-degree bends, or condensed vent terminations should clean more frequently. Our cleaning includes disconnection at the dryer, mechanical brush through the full vent length, inspection at the outdoor termination for bird nests and blockages, and a post-cleaning airflow measurement to confirm restoration. Typical cost runs $150-$300 for a residential vent up to 30 feet including the termination inspection.
Does duct cleaning actually improve indoor air quality?
The honest answer: sometimes yes, often no. The industry has a chequered reputation because low-quality operators over-promise. What duct cleaning definitively does: removes accumulated dust, dander, and small debris from supply and return ductwork, which reduces re-entrainment of that debris into indoor air when the blower runs. What duct cleaning definitively does not do: eliminate ongoing air quality problems that have sources other than dirty ducts.
Duct cleaning is worth the money in these specific scenarios. After a construction or renovation project where drywall dust or sawdust was drawn into the returns during work. After a rodent or pest infestation where droppings or nesting material contaminated the duct interior. In a newly-purchased home where the previous owners had heavy pets, smoked indoors, or had persistent mould issues. Or when a visible dust cloud discharges from supply registers within seconds of the blower starting, indicating heavy accumulation coating the interior. In these cases, professional cleaning to NADCA standards (negative-air machines with HEPA filtration, mechanical agitation brushes, and sealed vacuum collection) makes a measurable difference in indoor particulate levels.
Duct cleaning is a waste of money in these scenarios: routine cleaning without specific symptoms; ongoing allergy problems that persist despite regular filter replacement (the source is elsewhere, usually pet dander, dust mites, or outdoor pollen); or as a replacement for filter replacement (a MERV 11 filter changed quarterly does more for indoor air than annual duct cleaning). Best HVAC Toronto technicians survey the ductwork with a borescope before quoting so you can see the actual condition of your ducts and make an informed decision.
