Alberta · Energy · checked September 28, 2026

Blower door testing in Lethbridge

A blower door test measures how leaky a house is and shows where the leaks are. In Lethbridge, with about 4,274 heating degree-days a year, every leak runs up the heating bill for most of the year.

Get matched in Lethbridge → The blower door test, step by step
A red blower-door panel with a large fan fitted into the front doorway of a brick bungalow, a pressure gauge on a stool inside

Cost

Included in an evaluation

Evaluation price

Expect $400+

Licensed organizations

21

Houses built before 1961

19%

How Lethbridge is built

Lethbridge's houses by when they were built Ten house shapes, one for each tenth of Lethbridge's 33,945 houses. Before 1961: 19%, 1961–1990: 35%, 1991–2000: 11%, 2001 or later: 35%. Older houses glow hotter.
  • Before 1961 19%
  • 1961–1990 35%
  • 1991–2000 11%
  • 2001 or later 35%
Each house stands for one in ten of Lethbridge's 33,945 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.

Why air leakage matters in Lethbridge

Lethbridge gets about 4,274 heating degree-days a year and has a winter design temperature of −26.1°C, according to NRCan's HOT2000 climate data for Lethbridge. That's about 9% more heating demand than the middle of the 70 cities we cover.

Of Lethbridge's 33,945 houses (single-detached, semi-detached, row houses and duplexes), 19% were built before 1961 and 54% before 1991, according to the 2021 Census. Older houses usually test leakier than newer ones, and an EnerGuide report compares your result with homes of the same era, so you can see whether your house is typical or a problem.

After you seal: two checks

  • Combustion safety. In the Lethbridge area, the main heating energy is natural gas for 81% of households. A tighter house changes how fuel-burning appliances vent, so the spillage check should be repeated after serious air sealing. Combustion safety testing in Lethbridge
  • Radon. Sealing shifts the pressure balance between the house and the soil. Health Canada's 2012 survey found 9% of 111 homes tested in the Chinook Regional Health Authority health region above the guideline. The larger 2024 Cross-Canada survey reports 16.8% (1 in 6) of houses at or above the guideline for the Lethbridge, AB (Lethbridge CMA) metro area. Test before and after big air-sealing jobs. Radon testing in Lethbridge

What it costs in Lethbridge

A blower door test is part of every EnerGuide evaluation rather than a separate purchase. There's no provincial rebate or price list; the City of Edmonton's guidance is to expect more than $400 and to get two or three quotes.

How the test works

  • A calibrated fan is fitted into an exterior door and pulls air out until the house is at 50 pascals, the standard test pressure.
  • The result is air changes per hour at 50 Pa (ACH50): how many times an hour the whole volume of air would leak out and be replaced at that pressure.
  • While the fan runs, you and the advisor walk the house and feel for leaks at the attic hatch, rim joists, pot lights, trim and plumbing and wiring penetrations.
  • A second test after the work shows what changed, and it is what most rebates pay on.

The blower door test in detail.

NRCan-licensed service organizations serving Lethbridge

A blower door test is part of every EnerGuide evaluation, so any organization below can do one in Lethbridge. Ask to walk the house with the advisor while the fan runs.

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

Blower door test in Lethbridge: common questions

Where can I get a blower door test in Lethbridge?

Book an EnerGuide evaluation with any of the 21 NRCan-licensed organizations serving Lethbridge; the blower door test is part of every evaluation.

How much does a blower door test cost in Lethbridge?

It is included in an EnerGuide evaluation. There's no provincial rebate or price list; the City of Edmonton's guidance is to expect more than $400 and to get two or three quotes.

What is a good blower door result?

Lower is better. Your EnerGuide report compares your air changes per hour at 50 Pa with homes of the same era, which is more useful than a single target number.

Does air sealing affect radon?

It can. Tightening a house changes the pressure difference with the soil, so test for radon before and after major air sealing.

Blower door test near Lethbridge

Blower door test in Calgary177 kmBlower door test in Red Deer296 kmBlower door test in Sherwood Park427 kmBlower door test in Edmonton433 kmBlower door test in Kelowna475 km All 70 cities →

Sources

Checked September 28, 2026. Census figures are for the municipality (Alberta); climate data is NRCan's HOT2000 station Lethbridge (4 km away).

Get matched with a registered advisor in Lethbridge

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