Short answer: there is no single schedule that suits every home. Industry guidance recommends inspecting residential ducts every couple of years and cleaning them when the inspection shows buildup. In practice, many Ontario homes need cleaning every few years, and sooner after a renovation, a move, pets or pests.
Why there is no fixed number
The often-quoted “every 3 to 5 years” is a rule of thumb, not a standard. Two homes the same age can be completely different inside: one has a renovated basement and two dogs, the other has one careful owner and a good furnace filter. The right answer comes from looking inside the ducts, not from the calendar.
Signs your ducts need cleaning now
- Dust blowing out of the vents when the furnace or air conditioning starts
- Dust settling on furniture soon after you clean
- Visible dust, debris or pet hair when you lift a register cover
- A musty or stale smell when the system runs
- Weak airflow from some vents
- Signs of rodents or insects in the system
When to clean regardless of schedule
- After a renovation. Drywall dust and sawdust get pulled into the return ducts.
- After moving in. You do not know what the last owners left behind.
- In a new build. Construction debris often ends up in the ducts before move-in.
- After a pest problem. Droppings and nesting material need to come out.
- When someone has allergies or asthma and dust is a trigger.
How Ontario winters affect your ducts
Furnaces in Toronto, Vaughan, Richmond Hill, Aurora and Newmarket run for months every winter, moving the same indoor air through the ducts over and over. Fall, before the heating season starts, is the most practical time to book. Keeping indoor humidity between about 30 and 50 percent also helps limit mould and dust mites.
What you can do between cleanings
- Change the furnace filter on schedule, more often with pets or renovations.
- Vacuum register covers and return grilles regularly.
- Close vents and cover returns during renovation work.
- Keep the area around the furnace clean.
- Clean the dryer vent at least once a year.
Never steam clean ducts
Moisture inside ductwork can lead to mould. Proper duct cleaning is dry and mechanical: rotating brushes loosen the buildup and strong suction pulls it out. Our guide: Can you steam clean air ducts?
A simple way to decide for your home
Instead of booking on a fixed calendar, check a few things once a year, ideally in early fall before the furnace runs every day. Pull off one supply register and one return grille and look inside with a flashlight. A thin layer of dust is normal. Thick grey buildup, clumps, debris, pet hair mats or anything that looks like mould means the system is due. Then think about what happened in the house since the last cleaning: a renovation, a new pet, a move-in, water in the basement or someone with new allergy symptoms all move the date forward.
Homes that usually need cleaning sooner
- Homes with pets: hair and dander collect in returns and around the blower.
- Homes after drywall, sanding or flooring work: fine dust travels through open registers even with the furnace off.
- Older homes in Toronto and North York: long duct runs and older returns hold more buildup.
- New builds in Vaughan, Aurora and Newmarket: construction dust is often left in the system when the house is handed over.
- Homes where someone smokes or burns a wood fireplace often: residue sticks to duct walls.
Small habits that stretch the time between cleanings
Change or clean the furnace filter on the schedule the manufacturer gives, and more often during heavy use or after renovation work. Use the filter rating your furnace is designed for, because a filter that is too restrictive can reduce airflow. Vacuum floor registers when you vacuum the room. Keep registers closed and covered during any dusty work, and run the fan only after the cleanup is finished. Keep the area around the furnace clean and dry, since a damp basement feeds odours that end up in the air.
Book a duct inspection and cleaning
If you are not sure whether your ducts need cleaning, call UltiClean at (647) 676-0576 and describe what you see. When a cleaning makes sense, we clean supply and return ducts, the blower and registers with a rotating brush and high-power extraction. Read more about air duct cleaning or see whether duct cleaning is worth it.
Air Duct Cleaning Frequency FAQs
Can I clean my own ducts?
You can vacuum registers and the first few inches of each duct. Cleaning the full runs takes brushes and extraction equipment.
Does duct cleaning lower energy bills?
Clean ducts and a clean blower help the system move air, but savings vary. Be wary of anyone promising specific numbers.
Should a new home have its ducts cleaned?
Often, yes, because construction debris collects in new systems.
Not sure if your ducts need it? UltiClean can inspect and give you a straight answer. See air duct cleaning, what duct cleaning costs, or call (647) 676-0576.
Ready for a deep clean?
Carpets, air ducts and tile and grout across Richmond Hill, Aurora, Newmarket, Vaughan and Toronto.
Written by
Carpet, air duct and tile cleaning specialist at UltiClean
Seyedamir (Amir) Vafamand has 12 years of hands-on experience cleaning carpets, upholstery, air ducts, dryer vents and tile and grout in homes across Toronto, Vaughan, Richmond Hill, Aurora and Newmarket. This guide is based on that work.
- 12 years of experience
- 1,100+ jobs completed on Jiffy
- 98% approval rating
- $2M liability insurance
UltiClean Air Duct & Carpet Cleaning Services
54 Limeridge St
Aurora, ON L4G 7X9
(647) 676-0576, open 24 hours, 7 days a week