Quebec · Energy · checked September 28, 2026

Duct leakage and ductwork pressure testing in Sherbrooke

If some rooms never get warm in winter or cool in summer, the problem is often the ductwork, not the furnace or air conditioner. Duct testing matters in Sherbrooke homes that have forced-air heating or a ducted heat pump.

Get matched in Sherbrooke → Duct leakage and airflow testing
A duct-testing fan on a basement floor connected by flexible duct to a furnace, a pressure gauge hanging from a joist

Typical cost

$200–$450

Forced-air furnaces

Not published

Electric baseboards

50%

No ducts to test in these homes

Houses built before 1991

60%

Older houses usually leak more and have less insulation

How Sherbrooke is built

Sherbrooke's houses by when they were built Ten house shapes, one for each tenth of Sherbrooke's 41,360 houses. Before 1961: 18%, 1961–1990: 42%, 1991–2000: 13%, 2001 or later: 27%. Older houses glow hotter.
  • Before 1961 18%
  • 1961–1990 42%
  • 1991–2000 13%
  • 2001 or later 27%
Each house stands for one in ten of Sherbrooke's 41,360 houses (single-detached, semi-detached, row and duplex), drawn by when it was built. The glow shows the usual pattern: older houses tend to be leakier and less insulated. More snow in the drawing means more heating degree-days: a longer, colder heating season. Sources: Statistics Canada 2021 Census (table 98-10-0233-01), NRCan HOT2000 climate data.

Who needs it in Sherbrooke

In the Sherbrooke area, 50% of households heat mainly with electric baseboards and about 25% with a heat pump; electricity is the main heating energy for 66% of households (Statistics Canada, 2023).

Of Sherbrooke's 41,360 houses (single-detached, semi-detached, row houses and duplexes), 18% were built before 1961 and 60% before 1991, according to the 2021 Census. Ducts in older houses often run through unheated spaces with taped or unsealed joints, and supply runs to the far rooms are the first to suffer.

The same leaks cost you in summer when the ducts carry cooling: air from a central air conditioner or heat pump that escapes into an attic, garage or crawlspace is cooling you paid for, and leaky return ducts can pull in humid air. Sealing and balancing the ducts helps in both seasons, and it's worth doing before a new heat pump goes onto old ductwork.

What the test shows

  • Total duct leakage, as a share of the system's airflow, measured by pressure-testing the ductwork with a calibrated duct-pressurization fan.
  • Airflow at each register, which explains why one bedroom is always cold.
  • Whether sealing and balancing will fix comfort problems before you buy bigger equipment.

Duct leakage testing in detail.

What it costs

About $200–$450 (a September 2026 planning range; quotes vary). It isn't part of a standard EnerGuide evaluation, so ask for it when you book if comfort is your main complaint.

Great Lakes–St. Lawrence Southern Ontario and southern Quebec

What this means in Sherbrooke’s climate

Cold winters and hot, humid summers: seal the attic, dry the basement, plan cooling.

This region has real winters and hot, humid summers, so bills come from both heating and cooling. Natural gas heats most Ontario homes, while most Quebec homes use low-cost electricity. An EnerGuide evaluation here should cover air sealing and the attic, cooling and dehumidification, and keeping the basement dry before insulating it.

  • Right-size cooling to control humidity. In humid summers, an oversized air conditioner or heat pump cools quickly but shuts off before removing moisture, leaving rooms clammy. A heat pump replacing the air conditioner also covers much of the heating. Ask: Ask for a room-by-room heat-loss calculation and a duct and airflow check before replacing your air conditioner or furnace.

What else homes in Sherbrooke need →

Sources for this climate guide · checked October 26, 2026

NRCan-licensed service organizations serving Sherbrooke

In Quebec, EnerGuide evaluations for existing homes run through the provincial Rénoclimat program; the organizations below are the ones NRCan lists for Sherbrooke postal codes.

A service organization is a company that Natural Resources Canada (NRCan) licenses to deliver EnerGuide evaluations; its registered energy advisors do the home visit. Duct leakage testing isn't part of a standard EnerGuide evaluation. Some of these organizations offer it, as do HVAC contractors with duct-testing equipment, so ask when you call.

Source: NRCan list of licensed service organizations, checked September 28, 2026. Call to confirm your street is covered and ask about wait times.

Programs in Sherbrooke

Provincial Rénoclimat (Quebec) Since October 1, 2026: up to $21,500 per house for roof, wall and foundation insulation and ENERGY STAR Most Efficient windows, no evaluation required, plus a new flood-protection component Open Provincial Hydro-Québec LogisVert Hydro-Québec grants for heat pumps (thermopompes) of $50–$120 per 1,000 BTU/h, up to $6,700, plus $1,500 for roof insulation with caulking, appliances and solar — no audit needed Open Federal National Heat Pump Rebate Announced October 8, 2026 and opening early 2027: up to $10,000 below the median income, $2,000 for other eligible homeowners Announced · opens 2027 Federal CMHC Eco Improvement premium refund A 25% energy-efficiency rebate on your CMHC mortgage insurance premium after $20,000 of energy renovations Open Federal Canada Greener Homes Affordability Program Free retrofits for low-to-median-income households through provincial partners in BC, Manitoba, Newfoundland and Labrador, Nova Scotia, PEI and Quebec (Quebec's 2026–27 intake has closed) — not available in Ontario Open · deadline

Duct leakage testing in Sherbrooke: common questions

How much does duct leakage testing cost in Sherbrooke?

Plan on about $200–$450. It is usually a separate service from an EnerGuide evaluation.

Is duct cleaning the same thing?

No. Cleaning removes dust; it doesn't find or seal leaks. A leakage test measures where air is lost.

What is ductwork pressure testing?

The same thing as a duct leakage test: registers are sealed, a calibrated fan pressurizes the ducts, and the airflow needed to hold the test pressure shows how leaky they are.

Should I close vents in unused rooms?

Usually not. Closing registers raises duct pressure and can increase leakage elsewhere in the system.

Duct leakage testing near Sherbrooke

Duct leakage testing in Saint-Jean-sur-Richelieu107 kmDuct leakage testing in Longueuil120 kmDuct leakage testing in Trois-Rivières121 kmDuct leakage testing in Montréal134 kmDuct leakage testing in Terrebonne140 km All 70 cities →

Sources

Checked September 28, 2026. Census figures are for the municipality (Quebec); climate data is NRCan's HOT2000 station Lennoxville (9 km away).

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