Newfoundland and Labrador · Energy · checked September 28, 2026

Duct leakage testing in St. John's

If some rooms never get warm, the problem is often the ductwork, not the furnace. In the St. John's area, only about 6% of households heat with a forced-air furnace, so the test matters mainly for homes with ducts or those adding a ducted heat pump.

Get matched in St. John's → 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

about 6%

Electric baseboards

58%

Houses built before 1991

64%

How St. John's is built

St. John's's houses by when they were built Ten house shapes, one for each tenth of St. John's's 42,120 houses. Before 1961: 22%, 1961–1990: 42%, 1991–2000: 11%, 2001 or later: 26%. Older houses glow hotter.
  • Before 1961 22%
  • 1961–1990 42%
  • 1991–2000 11%
  • 2001 or later 26%
Each house stands for one in ten of St. John's's 42,120 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. Snowfall scales with heating degree-days. Sources: Statistics Canada 2021 Census (table 98-10-0233-01), NRCan HOT2000 climate data.

Who needs it in St. John's

In the St. John's area, 58% of households heat mainly with electric baseboards, about 7% with a heat pump, about 7% with a boiler and radiators and about 6% with a forced-air furnace; electricity is the main heating energy for 65% of households and oil for 12% (Statistics Canada, 2023).

Electric baseboards outnumber furnaces here, and a baseboard-heated house has no ducts to test. The test matters if you have forced air, or before you add a ducted heat pump to existing ductwork.

Of St. John's's 42,120 houses (single-detached, semi-detached, row houses and duplexes), 22% were built before 1961 and 64% 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.

What the test shows

  • Total duct leakage, as a share of the system's airflow, measured with a 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.

NRCan-licensed service organizations serving St. John's

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 St. John's

Provincial takeCHARGE (Newfoundland & Labrador) Utility rebates on selected equipment — thermostats, insulation offers and more, rotating seasonally — with no broad retrofit program behind them Open · deadline Federal CMHC Eco Improvement premium refund 25% back on your CMHC mortgage insurance premium after $20,000 of energy renovations Open

Duct leakage testing in St. John's: common questions

How much does duct leakage testing cost in St. John's?

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.

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 St. John's

Duct leakage testing in Charlottetown797 kmDuct leakage testing in Halifax893 kmDuct leakage testing in Moncton931 kmDuct leakage testing in Saint John1041 kmDuct leakage testing in Fredericton1070 km All 70 cities →

Sources

Checked September 28, 2026. Census figures are for the municipality (Newfoundland and Labrador); climate data is NRCan's HOT2000 station St-John's International (11 km away).

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