Alberta · Energy · checked September 28, 2026

Ventilation and humidity assessments in Calgary

Condensation on windows, musty basements and stuffy bedrooms are ventilation and humidity problems, and they're easy to confuse with insulation problems. A ventilation assessment measures which one you have.

Get matched in Calgary → The ventilation and humidity assessment
A heat recovery ventilator on a basement wall with four insulated ducts running up between the joists

Cost

Part of an evaluation

Houses built since 2001

36%

Tighter houses that usually rely on an HRV or ERV

Houses built before 1961

10%

Older houses usually leak more and have less insulation

Winter design temperature

−26.2°C

Colder days mean more window condensation

How Calgary is built

Calgary's houses by when they were built Ten house shapes, one for each tenth of Calgary's 379,710 houses. Before 1961: 10%, 1961–1990: 38%, 1991–2000: 17%, 2001 or later: 36%. Older houses glow hotter.
  • Before 1961 10%
  • 1961–1990 38%
  • 1991–2000 17%
  • 2001 or later 36%
Each house stands for one in ten of Calgary's 379,710 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.

Why Calgary homes get humidity problems

Calgary gets about 4,876 heating degree-days a year, a measure of how much heating its climate needs, and its winter design temperature, the cold day heating systems are sized for, is −26.2°C. Those figures come from the climate data for Calgary International in HOT2000, the home-energy software Natural Resources Canada (NRCan) gives energy advisors. On Calgary's coldest days, window glass and poorly insulated corners get cold enough for condensation at humidity levels that feel normal indoors, so winter humidity needs to stay at the lower end of the comfortable range.

Of Calgary's 379,710 houses (single-detached, semi-detached, row houses and duplexes), 10% were built before 1961 and 47% before 1991, according to the 2021 Census. Newer houses (36% of Calgary's were built since 2001) are tight and usually have an HRV or ERV that needs balancing and cleaning. Older houses that get air-sealed can lose the accidental ventilation they used to rely on.

Wildfire smoke reaches Calgary in some summers. The Government of Canada's advice is to keep windows and doors closed, limit exhaust fans and use the best filter your system can handle, so ask the advisor what your furnace or HRV can take. An HRV or ERV brings in outdoor air, so ask the installer or check the maker's instructions for how to run yours on smoky days.

What the assessment measures

  • Relative humidity in living areas and the basement.
  • Actual airflow from bath and kitchen fans, and whether they vent outside rather than into the attic.
  • How much fresh air the house gets, and whether an HRV or ERV is balanced.

The ventilation and humidity assessment in detail.

Related tests in Calgary

Mold and air quality testing in Calgary · Radon testing in Calgary

Prairies Alberta, Saskatchewan and Manitoba

What this means in Calgary’s climate

Long, very cold, very dry winters: air sealing, radon testing and humidity balance lead.

Heating is the big bill here: winters are long and very dry, and cold snaps reach −30°C to −35°C. Radon is common, and electricity prices vary widely between provinces, which changes what pays back. An EnerGuide evaluation should focus on air sealing, attic and basement insulation, a radon test and safe humidity levels.

  • Balance dry air against condensation. Winter air is extremely dry, but humidifying too much frosts windows and can wet walls and attic sheathing. The colder it gets outside, the lower indoor humidity must be. Ask: Ask for a ventilation assessment and a target indoor relative humidity that suits your windows and outdoor temperatures.

What else homes in Calgary need →

Sources for this climate guide · checked October 26, 2026

NRCan-licensed service organizations serving Calgary

A service organization is a company that Natural Resources Canada (NRCan) licenses to deliver EnerGuide evaluations; its registered energy advisors do the home visit. Advisors assess ventilation and humidity as part of an evaluation and check that exhaust fans actually vent outside. Sizing an HRV or ERV may be extra.

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 Calgary

Provincial · needs an evaluation Clean Energy Improvement Program (Alberta) Property-tax financing in 27 Alberta municipalities, with an EnerGuide evaluation required; Calgary is closed until winter 2026/27 and Edmonton is waitlisting Open · deadline

Ventilation and humidity assessment in Calgary: common questions

HRV or ERV?

Both bring in fresh air and recover heat. An ERV also transfers some moisture, which helps keep very dry winter air from getting drier; an HRV suits houses that tend to run humid.

Why did condensation appear after we got new windows?

Tighter windows cut accidental air leakage, so humidity builds up. The fix is usually controlled ventilation, not leakier windows.

Is a ventilation assessment part of an EnerGuide evaluation in Calgary?

Advisors assess ventilation and humidity during the evaluation; HRV or ERV sizing may be an extra service.

Ventilation and humidity assessment near Calgary

Ventilation and humidity assessment in Red Deer136 kmVentilation and humidity assessment in Lethbridge177 kmVentilation and humidity assessment in Sherwood Park279 kmVentilation and humidity assessment in Edmonton280 kmVentilation and humidity assessment in Kelowna399 km All 70 cities →

Sources

Checked September 28, 2026. Census figures are for the municipality (Alberta); climate data is NRCan's HOT2000 station Calgary International (8 km away).

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