What does professional duct cleaning cost for a three-bedroom Toronto home?

Professional duct cleaning for a typical three-bedroom Toronto home costs $300 to $700 from a reputable company using truck-mounted equipment and source-removal techniques. The exact price depends on the size of the system (number of supply registers, return grilles, and trunk lines), the level of contamination, and whether the home has a single system or multiple HVAC units.

A legitimate duct cleaning involves a truck-mounted vacuum creating strong negative pressure throughout the duct system while a technician uses agitation tools — rotating brushes, compressed air whips, or skipper balls — to dislodge debris from duct walls. The dislodged dust, pet hair, construction debris, and other contaminants are pulled into the truck-mounted HEPA filtration system. The process typically takes two to four hours for a three-bedroom home with one furnace and includes cleaning all supply ducts, return ducts, the supply and return plenums, the blower compartment, and the evaporator coil housing. Some companies include the furnace blower cleaning in the base price while others charge $50 to $150 extra for it — ask before booking.

Be extremely cautious of companies advertising $99 or $149 whole-house duct cleaning. These low-ball offers are almost always bait-and-switch operations. The technician arrives, performs a cursory cleaning with inadequate portable equipment, then pressures you into $500 to $2,000 in unnecessary add-on services like antimicrobial coatings, ozone treatments, or sanitizing sprays. Some even fabricate mould findings to upsell remediation services. Look for NADCA-certified companies (National Air Duct Cleaners Association), check reviews carefully, and confirm the price includes a truck-mounted system with source removal — not just a portable vacuum.

Duct cleaning frequency depends on your situation. Most GTA homes benefit from cleaning every three to five years. You should consider cleaning sooner if you have just completed a renovation (drywall dust and construction debris are the number-one reason for duct cleaning), if you have moved into a home with pets and the previous owner did not maintain the ducts, or if you notice visible dust blowing from registers when the system starts. Homes with family members who have allergies or asthma may benefit from more frequent cleaning.

One important caveat: if a duct cleaning company finds mould in your ductwork, cleaning alone will not solve the problem. Mould in ducts indicates a moisture source — typically condensation on uninsulated ducts in a basement or attic, a humidifier set too high, or a leak somewhere in the system. The moisture source must be identified and corrected, or the mould will return within months. Get matched with a ductwork contractor through Toronto Ductwork for a free assessment of your system.