Ontario · 16 local services · checked September 28, 2026

Home energy audits and home testing in Thunder Bay

Thunder Bay gets about 5,405 heating degree-days a year, 43% of its houses were built before 1961, and 8 NRCan-licensed service organizations list its postal codes. Pick a service for the local details.

Energy audits in Thunder Bay → All 16 services
A Victorian red-brick semi-detached house with a front porch in autumn

How Thunder Bay is built

Thunder Bay's houses by when they were built Ten house shapes, one for each tenth of Thunder Bay's 37,935 houses. Before 1961: 43%, 1961–1990: 41%, 1991–2000: 7%, 2001 or later: 9%. Older houses glow hotter.
  • Before 1961 43%
  • 1961–1990 41%
  • 1991–2000 7%
  • 2001 or later 9%
Each house stands for one in ten of Thunder Bay's 37,935 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.

Thunder Bay at a glance

Climate

Thunder Bay gets about 5,405 heating degree-days a year and has a winter design temperature of −28.6°C, according to NRCan's HOT2000 climate data for Thunder Bay.

Housing

Of Thunder Bay's 37,935 houses (single-detached, semi-detached, row houses and duplexes), 43% were built before 1961 and 84% before 1991, according to the 2021 Census. The typical house dates from 1961–1970.

Heating

In the Thunder Bay area, 84% of households heat mainly with a forced-air furnace; natural gas is the main heating energy for 81% of households (Statistics Canada, 2023).

Radon

Health Canada's 2012 survey found 12% of 108 homes tested in the Thunder Bay District Health Unit health region above the guideline. The larger 2024 Cross-Canada survey reports 34.3% (1 in 3) of houses at or above the guideline for the Thunder Bay, ON (Thunder Bay CMA) metro area.

Local service guides for Thunder Bay

Energy audits and tests

An energy advisor’s kit on a front-hall bench: infrared camera, pressure gauge with tubing, tape measure, headlamp and a floor sketch

Home energy audit

8 licensed organizations
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

Blower door test

5,405 degree-days
Hands holding an infrared camera aimed at a ceiling corner beside a frosty window; the screen shows a cold streak

Thermal imaging inspection

5,405 degree-days
A kitchen table with a house floor plan, a laser measure, a tape measure and a laptop showing the plan

Heat loss calculation

Design temp −28.6°C
A duct-testing fan on a basement floor connected by flexible duct to a furnace, a pressure gauge hanging from a joist

Duct leakage testing

84% forced-air
A gloved hand inserting a combustion analyzer probe into a furnace flue pipe in a basement

Combustion safety test

81% heat with gas
A heat recovery ventilator on a basement wall with four insulated ducts running up between the joists

Ventilation and humidity assessment

9% built since 2001
Loose-fill insulation between attic joists, a yellow ruler showing its depth and frost on the roofing nails above

Attic insulation inspection

84% built before 1991
Utility bills and a phone showing a monthly energy-use chart on a kitchen table

Energy bill analysis

Synergy North

Home health tests

A small digital radon monitor on a bookshelf in a finished basement family room

Radon testing

34.3% at or above guideline (2024)
A carbon monoxide alarm on an upstairs hallway wall outside the bedrooms at night

Carbon monoxide testing

Required by law
A moisture meter pressed into water-stained basement drywall, an air-sampling pump on a tripod nearby

Mold and air quality testing

84% built before 1991
A gloved hand holding a sealed sample bag above vermiculite insulation between attic joists

Asbestos and vermiculite testing

84% built before 1991
A gloved hand swabbing layers of cracked old paint on a wooden window sill

Lead paint testing

43% built before 1961
Filling a water-sample bottle at a farmhouse kitchen tap with the aerator removed, snowy fields and a barn outside

Well water testing

Wells in some areas

For businesses and buildings

An auditor walking between rooftop heating and cooling units on a snowy commercial roof

Commercial energy audit

5 incentive programs

Who does energy evaluations in Thunder Bay

8 NRCan-licensed service organizations list Thunder Bay postal codes. See the list with phone numbers and coverage →

Rebates and financing for Thunder Bay homes

Provincial · needs an evaluation Home Renovation Savings — Home Energy Assessment path Up to $10,000 per home for insulation, windows and air sealing, plus $600 back on your assessments — if the follow-up assessment is done by December 31, 2026 Open · deadline Provincial Home Renovation Savings — direct rebates (no assessment) Heat pumps up to $7,500 ($12,000 ground-source), solar with battery up to $10,000, plus attic, thermostat and appliance rebates — no assessment needed Open Federal CMHC Eco Improvement premium refund 25% back on your CMHC mortgage insurance premium after $20,000 of energy renovations Open

Cities near Thunder Bay

Winnipeg590 kmGreater Sudbury665 kmWindsor846 kmChatham-Kent864 kmBarrie869 kmWaterloo875 km All 70 cities →

Sources

Checked September 28, 2026.

Planning upgrades in Thunder Bay?

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Email us what you’re planning, your postal code and the type of building (a house, a duplex or triplex, or a larger multi-unit building) — we’ll reply with registered service organizations for your area and which rebates apply.

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