District Air Systems Inc., HVAC contractor in Innisfil and Simcoe County
Ductwork

Ductwork Installation, Repair & Sealing

Right-sized ducts, sealed properly, the single biggest fix for uneven room temperatures.

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TSSA Licensed · HRAI · WSIB
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TSSA #000290047
Gas Technician Licensed
HRAI Member
Heating, Refrigeration & AC Institute
WSIB Covered
Workplace Safety Insured
Up to $7,500 in Rebates
Ontario program terms apply
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About our hvac ductwork, installation, repair & sealing service

Half of the comfort complaints we see are ductwork problems, not equipment problems. We design and install custom ductwork for additions and new builds, repair damaged runs, and seal leaky joints with mastic and Aeroseal-style sealants. Full ductwork replacement is available when the existing system is undersized or beyond repair.

Ductwork is the quiet reason so many Simcoe County systems underperform. Bradford farmhouses converted to forced air, 1970s Bayview-corridor homes in Newmarket, and Barrie's downtown brick stock all share the same story: modern high-CFM blowers pushed through trunk lines sized for equipment two generations older. We measure static pressure first, then resize, reseal, and rebalance, which routinely fixes a hot upstairs that three previous equipment swaps never touched.

What's included

  • Custom sheet-metal ductwork for additions and new builds
  • Duct sealing with mastic or aerosol sealants
  • Vent, register, and return-air modifications
  • Full ductwork replacement when needed

How the visit works

  1. 1
    Design or diagnose
    Manual D duct design for new work; airflow testing for existing systems.
  2. 2
    Install, repair, or seal
    Sheet-metal fabrication, joint sealing, or full replacement as required.
  3. 3
    Balance
    Every register measured and dampered to design CFM.

Where we provide hvac ductwork, installation, repair & sealing

Innisfil is home base, and our trucks run the same routes daily across Simcoe County and north York Region.

  • Barrie Barrie's older downtown and Allandale homes leak air at the envelope but not at the ducts, which is exactly the combination that leaves upstairs rooms stale.
  • Bradford West Gwillimbury Marsh soil and farm activity around Bradford push a lot of fine dust indoors, and filtration there earns its keep every spring.
  • Essa Rural Essa properties on well water and gravel roads deal with grit that a one-inch filter simply cannot hold.
  • East Gwillimbury Newer Queensville and Sharon homes are sealed tight enough that mechanical ventilation is the only thing keeping indoor humidity in range.
  • Springwater Wood heat is still common through Elmvale and Hillsdale, and combustion particulate is the main air-quality concern we address there.
  • Newmarket Allergy complaints in Newmarket peak with the spring pollen load, and a properly sealed return does more than any add-on filter.
  • Oro-Medonte Walk-out basements and lakeside crawlspaces across Oro-Medonte drive the summer humidity problems homeowners call us about.
  • New Tecumseth Alliston's mix of farmland and industry means both pollen and fine particulate, so we usually spec media depth over gimmick features.

Need service today? We can be there.

Same-day appointments across Innisfil, Barrie, and Simcoe County, with live dispatch 24/7.