How often should I have my ductwork cleaned in a Toronto home with pets?

For Toronto homes with pets, professional duct cleaning every 3 to 4 years is a reasonable guideline, compared to the standard 5 to 7 year recommendation for pet-free homes. However, the real answer depends on how many pets you have, their shedding level, whether anyone in the household has allergies or asthma, and whether you are maintaining your furnace filter diligently.

Pet hair and dander are lighter than regular household dust and stay airborne longer, which means they get pulled into the return air system more readily. Once inside the ductwork, pet hair accumulates on duct walls, around register boots, and on the evaporator coil. Over time, this buildup restricts airflow, reduces system efficiency, and becomes a food source for dust mites and bacteria. If you have multiple shedding pets — say two dogs or a dog and a cat — the accumulation happens significantly faster, and cleaning every 2 to 3 years may be warranted.

The single most important thing you can do between professional cleanings is change your furnace filter regularly. With pets in the home, standard 1-inch filters should be changed every 30 to 60 days rather than the typical 90 days. The filter is your first line of defence against pet hair entering the duct system. Consider upgrading to a MERV 11 or MERV 13 filter, which captures finer particles including pet dander. MERV 13 filters catch particles as small as 0.3 microns, which includes most allergens. Be aware that higher-MERV filters create more airflow resistance, so confirm with your furnace manual or an HVAC technician that your blower can handle the upgrade without excessive static pressure drop. A 4-inch media filter cabinet (replacing the standard 1-inch filter slot) costs $200 to $400 installed and provides far better filtration with less airflow restriction because of its larger surface area.

Regularly vacuum and clean your return air grilles and supply registers — pet hair accumulates on these surfaces and gets sucked into the system every time the blower runs. Remove floor registers quarterly, wash them with soap and water, and vacuum the visible portion of the duct opening below. This takes five minutes per register and prevents a surprising amount of pet hair from entering the duct system.

When you do schedule professional duct cleaning, choose a NADCA-certified company that uses truck-mounted vacuum equipment with HEPA filtration and source removal technique (agitating debris loose from duct walls, then vacuuming it out). This is the only method that effectively removes embedded pet hair and dander from the duct system. A legitimate whole-house duct cleaning in the GTA runs $300 to $700 depending on the size of the home and number of vents. Companies advertising $99 whole-house specials are running bait-and-switch operations — they will either do inadequate work or pressure you into expensive add-on services.

Watch for signs that cleaning is overdue: visible dust or pet hair blowing from supply registers, musty odours when the system runs, or worsening allergy symptoms indoors. If you notice any of these, do not wait for the next scheduled cleaning — book one promptly.