Ontario · 16 local services · checked September 28, 2026

Home energy audits and home testing in Ajax

Ajax gets about 3,863 heating degree-days a year, 6% of its houses were built before 1961, and 27 NRCan-licensed service organizations list its postal codes. Pick a service for the local details.

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

How Ajax is built

Ajax's houses by when they were built Ten house shapes, one for each tenth of Ajax's 35,260 houses. Before 1961: 6%, 1961–1990: 36%, 1991–2000: 15%, 2001 or later: 44%. Older houses glow hotter.
  • Before 1961 6%
  • 1961–1990 36%
  • 1991–2000 15%
  • 2001 or later 44%
Each house stands for one in ten of Ajax's 35,260 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.

Ajax at a glance

Climate

Ajax gets about 3,863 heating degree-days a year and has a winter design temperature of −19.8°C, according to NRCan's HOT2000 climate data for Toronto Buttonville, the closest comparable location in that data set (27 km away).

Housing

Of Ajax's 35,260 houses (single-detached, semi-detached, row houses and duplexes), 6% were built before 1961 and 42% before 1991, according to the 2021 Census. The typical house dates from 1996–2000.

Heating

In the Toronto area, 59% of households heat mainly with a forced-air furnace, 8% with a boiler and radiators, 5% with electric baseboards and 4% with a heat pump; natural gas is the main heating energy for 52% of households and electricity for 18% (Statistics Canada, 2023).

Radon

In Health Canada's 2012 survey, none of the 95 homes tested in the Durham Regional Health Unit health region were above the guideline, a small sample that doesn't rule radon out. The larger 2024 Cross-Canada survey reports 4.5% (1 in 22) of houses at or above the guideline for Toronto Metro Area (Toronto CMA).

Local service guides for Ajax

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

27 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

3,863 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

3,863 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 −19.8°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

59% forced-air
A gloved hand inserting a combustion analyzer probe into a furnace flue pipe in a basement

Combustion safety test

52% heat with gas
A heat recovery ventilator on a basement wall with four insulated ducts running up between the joists

Ventilation and humidity assessment

44% 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

42% built before 1991
Utility bills and a phone showing a monthly energy-use chart on a kitchen table

Energy bill analysis

Elexicon Energy

Home health tests

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

Radon testing

4.5% 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

42% built before 1991
A gloved hand holding a sealed sample bag above vermiculite insulation between attic joists

Asbestos and vermiculite testing

42% built before 1991
A gloved hand swabbing layers of cracked old paint on a wooden window sill

Lead paint testing

6% 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 rare

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 Ajax

27 NRCan-licensed service organizations list Ajax postal codes. See the list with phone numbers and coverage →

City programs in Ajax

Durham Greener Homes Loan

Durham Region local improvement charge loan (Durham Greener Homes): up to $125,000 at 2% interest, fixed 15-year repayment on the property tax bill, with up to 50% of eligible funds available up front. At least 80% must go to energy-efficiency upgrades (insulation, windows, air sealing, heat pumps, heat pump water heaters, solar, batteries); up to 20% can go to other eligible items (flood/weather resilience, electrical, EV charging, EnerGuide evaluation and permit costs). Pre- and post-retrofit EnerGuide evaluations are required (pre-retrofit on or after April 28, 2022). Start by booking a free Greener Homes Coach consultation.

Durham Greener Homes coaching, Weather-ready Home Assessment and vHEAT

Free services for Durham Region residents: a Greener Homes Coach (unbiased advice on retrofits, rebates and financing), a free Weather-ready Home Assessment (extreme heat and cold, flooding and wind vulnerabilities), and vHEAT, an online virtual home energy assessment tool. Delivered by Windfall Ecology Centre for the Region.

Rebates and financing for Ajax 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 Ajax

Pickering7 kmWhitby7 kmOshawa15 kmMarkham22 kmClarington29 kmRichmond Hill32 km All 70 cities →

Sources

Checked September 28, 2026.

Planning upgrades in Ajax?

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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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