Duct Cleaning & Maintenance

The duct system in a GTA home circulates air through every room hundreds of times per day, and everything that air carries — dust, pet dander, pollen, cooking residue, renovation debris, and moisture — gradually accumulates on duct interior surfaces. Over three to five years of normal operation, this buildup reaches the point where it measurably affects indoor air quality, reduces HVAC efficiency by restricting airflow, and provides a substrate for mould growth in sections where condensation occurs. After a renovation project — particularly drywall sanding, demolition, or flooring installation — duct contamination can be severe enough to warrant immediate cleaning rather than waiting for the standard maintenance interval. Professional duct cleaning follows NADCA (National Air Duct Cleaners Association) standards, which specify a source-removal method: a powerful vacuum — typically a truck-mounted unit generating 10,000 to 15,000 CFM of suction — is connected to the main trunk line, placing the entire duct system under negative pressure. Technicians then work through each branch duct from the register end, using compressed air tools, rotating brushes, and agitation devices to dislodge accumulated debris from duct walls. The negative pressure pulls all dislodged material toward the vacuum, preventing it from being blown into the living space. Supply ducts, return ducts, the air handler compartment, and the evaporator coil housing are all addressed in a thorough cleaning. This process is fundamentally different from the cheap services advertised across the GTA — the notorious "$99 whole-house duct cleaning" offers that blanket Toronto mailboxes and Google ads. These operations typically use a portable shop vacuum and a single air hose, spending 30 minutes in the home and cleaning only the first few feet of each duct visible from the register. They leave the trunk lines, return plenums, and the majority of the duct system untouched. GTA-specific factors make duct cleaning more important than in many other markets. Toronto's ongoing construction boom means homes near active development sites — which is nearly everywhere in the GTA — face elevated levels of construction dust entering through the HVAC system's outdoor air intake and envelope leaks. The transition from heating to cooling season in April and May creates condensation on cold duct surfaces that combines with accumulated dust to form a paste that resists simple air-washing. Professional duct cleaning in the GTA runs $300 to $700 for a standard residential system, depending on home size, number of vents, duct material, and whether the furnace blower and evaporator coil are included in the scope.

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