How much does Aeroseal duct sealing cost for a typical three-bedroom Toronto home?

Aeroseal duct sealing for a typical three-bedroom Toronto home runs $1,500–$3,500, with most GTA homeowners landing in the $2,000–$2,800 range depending on home size, duct system complexity, and the extent of leakage.

The price reflects both the proprietary Aeroseal equipment and process, and the labour involved in setting up, pressurizing, and testing the system. Unlike traditional mastic sealing, Aeroseal works from the inside — a technician seals off all your registers and return grilles, then injects a fine aerosol mist of vinyl acetate polymer particles into the pressurized duct system. Those particles travel with the airstream and accumulate at leak points, sealing gaps up to 5/8 of an inch without any dismantling of your ductwork. The process typically takes 4–6 hours for a standard three-bedroom home.

What makes Aeroseal particularly valuable in the GTA is that most of the leakage in older homes occurs in places you simply cannot reach — inside wall cavities, above finished ceilings, in enclosed chases between floors. A post-war Scarborough or North York home with a 50-year-old duct system can easily lose 25–40% of conditioned air to leakage before it ever reaches a living space. Traditional mastic sealing only addresses joints you can physically access in the basement or utility room. Aeroseal reaches everything.

What Affects the Price

The main cost variables are home size and baseline leakage. A 1,200 sq ft bungalow with a simple duct layout costs less than a 2,500 sq ft two-storey with ducts running through multiple floors and an attic. Severely leaky systems with large gaps may require a second pass or supplemental mastic work on accessible joints before Aeroseal can effectively pressurize the system — this adds $300–$600 to the job. Some contractors also charge extra for pre- and post-test reporting, though reputable Aeroseal installers include this as standard — the computerized before-and-after leakage report is one of the technology's biggest selling points, giving you documented proof of the improvement.

Is It Worth It for a Toronto Home?

For homes with inaccessible ductwork, Aeroseal is almost always worth the investment. The Department of Energy estimates that typical duct systems leak 20–30% of conditioned air — in Toronto's climate, where you're running a furnace hard from November through March and air conditioning from June through August, that leakage translates directly to wasted energy dollars. A well-sealed duct system can reduce heating and cooling costs by 15–25% annually. At current Toronto gas and electricity rates, a $2,500 Aeroseal job often pays back in 4–7 years purely on energy savings, before accounting for improved comfort and reduced equipment wear.

Aeroseal is especially worth considering before adding a new furnace or heat pump — sealing the duct system first means your new equipment is sized correctly for the actual delivered airflow, not the leaky baseline. Many GTA HVAC contractors now recommend Aeroseal as a prerequisite to equipment replacement in older homes.

Practical tip: Get quotes from two or three Aeroseal-certified installers. Ask each one for a pre-test leakage estimate and a sample post-job report so you understand exactly what you're getting. The before-and-after CFM leakage numbers should be clearly documented. Be cautious of any contractor quoting significantly below $1,500 — the Aeroseal equipment and licensing have real costs that legitimate installers can't avoid.

Toronto Ductwork can match you with local ductwork professionals experienced with Aeroseal sealing in the GTA — get matched for free through the Toronto Construction Network.