How Often Should You Clean Air Ducts? A Canadian Homeowner's Guide
How often should air ducts be cleaned? NADCA and Health Canada guidelines for Canadian homes — plus signs it's overdue and what a professional cleaning includes.
The National Air Duct Cleaners Association (NADCA) recommends professional duct cleaning every 3–5 years. In Canada's climate, where furnaces run 6+ months a year, most homes benefit from the shorter end of that range.
Frequency by household type
- Standard home, no pets: every 4–5 years
- Home with pets: every 2–3 years
- Allergy or asthma sufferers: every 2 years
- After renovation or construction: immediately
- Newly purchased home: within the first year
What a professional cleaning includes
A NADCA-standard clean covers every supply and return vent, the main trunk, the blower motor, the furnace cabinet, and the AC coil. Expect the job to take 3–5 hours in most homes.
DIY vs professional
DIY vacuum jobs only reach the first 30 cm of each vent. Professional trucks pull negative pressure through your entire system and dislodge contaminants deep inside — impossible with home tools.
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