A home energy audit in Burlington, Oakville or Hamilton is an EnerGuide home evaluation performed by an energy advisor registered with Natural Resources Canada: a blower-door test that measures how leaky the house is, an inventory of the insulation, windows and mechanical equipment, and a report that ranks the upgrades most likely to cut your bills. It is not a sales visit, and it is not an HVAC service call. For most homeowners the real question is narrower than whether it is worth it — it is whether the rebate you want requires one, and what the report will change about the order of your projects.
What Actually Happens During the Evaluation
Expect a couple of hours and full access to the house, including the attic hatch, the mechanical room and any crawl space. The advisor is collecting inputs for a model, so the visit is measurement and inventory rather than opinion.
- A blower door goes in an exterior doorway and depressurises the house to a standard pressure, producing an air-tightness figure. That single number drives a large share of the modelled heating load.
- With the fan running, the advisor walks the house finding where air is pulling in — attic hatches, pot lights, rim joists, plumbing and wiring penetrations, and around old windows.
- Insulation is inventoried by depth and type in the attic, walls where visible, basement or crawl space, and any cantilevered floor.
- Windows and doors are recorded by type, age and glazing rather than tested individually.
- Mechanical equipment is logged: furnace or boiler make, model and efficiency, water heater type, HRV, and the thermostat.
- The result is a modelled EnerGuide rating for the house plus a prioritised upgrade report, and a second visit after the work produces an updated rating.
When a Rebate Requires One — and When It Does Not
This is the part that changes, so treat the specifics as a starting point and confirm on the official program page before you book anything.
- Ontario's Home Renovation Savings Program, launched in January 2025 and delivered through Save on Energy with Enbridge Gas, is the live provincial route. A heat pump installed as a single measure has not required a pre-retrofit evaluation, which is why so many homeowners skip the audit entirely. Details on the Home Renovation Savings Program page.
- Envelope work — attic insulation, air sealing, wall and basement insulation — is where evaluations are still typically part of the process, because the savings have to be modelled rather than read off a nameplate.
- Enbridge's Home Efficiency Rebate Plus has ended, and the federal Canada Greener Homes Grant closed to new applicants in 2024. Anything you read online promising either of them is out of date. The interest-free federal loan has continued to operate alongside the provincial incentives.
- The federal Oil to Heat Pump Affordability program is a narrow one: it is for homes that heat with oil, which in this region means a scattering of rural Ancaster, Dundas and Flamborough addresses rather than anything on the gas main. If you are on oil, read that program page directly — its eligibility rules are nothing like the provincial ones.
- Program budgets and deadlines move. The current picture across all of them is summarised on our Ontario HVAC rebates hub.
The honest framing: get an evaluation because you plan to do envelope work and want it prioritised properly, or because a program requires one. Getting one purely to confirm that your 1958 bungalow is leaky is an expensive way to learn something you already suspect.
What Evaluations Typically Find in Burlington and Oakville
Halton's housing stock falls into three fairly clean groups, and each produces a familiar report.
- 1950s and 1960s bungalows in Aldershot, Roseland, Kerr Village and Bronte: shallow attic insulation, an uninsulated and unsealed rim joist all the way around the basement, a leaky attic hatch, and original storm-era windows. The rim joist and the attic together usually top the list.
- 1970s and 1980s sidesplits in Tyandaga, Brant Hills, Glen Abbey and River Oaks: split-level ceilings with kneewalls that were never air-sealed, cantilevered floors over a porch or garage, and sliding patio doors on their original weatherstripping.
- 2000s and newer homes in Millcroft, Alton Village, the Orchard and north Oakville: the envelope is generally decent, so the findings move to duct leakage into attics and garages, bathroom and range fans terminating badly, and an HRV that was never balanced or commissioned.
What They Find in Hamilton
Free quotes, written pricing.
- Lower-city pre-war brick in Durand, Kirkendall, Crown Point and Westdale: solid double-wythe masonry walls have no cavity to fill, so the achievable wins are attic insulation, basement header sealing, weatherstripping, chimney and duct sealing, and interior storm panels rather than wall insulation.
- Mountain and escarpment-brow homes: exposure is the story. Wind driven across open ground turns modest air leakage into a large heating penalty, and air sealing outperforms adding insulation on top of an already-insulated attic.
- Older Ancaster and Dundas houses: additions built in different decades and stitched together, with the worst leakage at the junctions between the eras.
- Binbrook, Waterdown and upper Stoney Creek subdivisions: like north Oakville, the report tends to be about distribution and ventilation rather than the envelope.
Order of Operations: Envelope Before Equipment
The sequence matters more than any individual measure. Air sealing and attic insulation reduce the heat loss of the house permanently, which means the heating system you buy afterwards can be smaller, cheaper and better matched.
Do it the other way around and you pay for capacity you no longer need, then live with an oversized system that short-cycles and never runs at its efficient point. If a heat pump is on your list, this argument is even stronger, because oversizing hurts a modulating heat pump more than it hurts a furnace. Any equipment quote you accept afterwards should be based on a fresh heat loss calculation reflecting the upgrades.
What an Energy Audit Will Not Tell You
- It will not size your heating or cooling equipment. That is a CSA F280 calculation done by the installing contractor, using the house as it will be after the retrofits.
- It will not diagnose a broken furnace. That is a service call, typically $90–$150 for the diagnostic, and a completely different visit.
- It will not measure airflow room by room unless you specifically arrange it, so a persistently cold bedroom may not appear in the report at all.
- It is not a home inspection: no structural, roofing, electrical or plumbing verdicts.
- It will not judge whether the recommended upgrades are worth doing to you. Payback tables assume energy prices that change.
Free Diagnostics You Can Do This Weekend
- On a windy day, hold a lit incense stick near outlets on exterior walls, the attic hatch, and where the basement wall meets the floor above. Movement means air, and air means heat.
- Open the attic hatch and look at the insulation depth against the top of the joists. If you can see the joists clearly, the attic is a candidate.
- Count your return air grilles. One per floor in a two-storey house is the most common cause of uneven temperatures in this region.
- Watch your windows on a cold night. Persistent condensation is a humidity and air-movement signal worth reading — why windows fog up in winter explains what it means.
- Read a full year of gas and electricity bills side by side. Seasonal shape tells you whether the problem is the envelope, the equipment or how the thermostat is being used — a pattern we walk through in why winter heating bills spike.
Where We Fit
We are not energy advisors and we do not perform EnerGuide evaluations — that is a separate registration, and a contractor selling both should give you pause. What we do is read the report with you, translate the recommendations into a heat loss calculation, and quote the mechanical work that follows. If the report says air seal and insulate first, we will tell you to do that before buying equipment from us.
When the envelope work is done and you are ready to size the heating system properly, get in touch with the report in hand and we will build the numbers from it.
Frequently asked questions
Who performs home energy audits in Burlington, Oakville and Hamilton?
Energy advisors registered with Natural Resources Canada, working through a licensed service organization. HVAC contractors are not energy advisors, and the EnerGuide evaluation is deliberately independent of whoever sells you the equipment afterwards.
Do I need an energy audit to get a heat pump rebate in Ontario?
Recent provincial program rules have not required a pre-retrofit evaluation when a heat pump is installed as a single measure, which is why many homeowners skip it. Envelope upgrades are where evaluations are usually still involved. Requirements change, so confirm on the official program page before booking.
What is a blower door test measuring?
It depressurises the house with a calibrated fan and measures how much air the building leaks at a standard pressure. That number is the single largest input into the modelled heating load, and it is what turns vague drafts into a figure you can improve and re-measure.
Should I insulate before or after replacing my furnace?
Before, whenever the timing allows. Air sealing and attic insulation permanently lower the heat loss of the house, which means the replacement can be sized smaller and will run at its efficient point more of the time. Doing it in reverse leaves you with equipment sized for a house that no longer exists.
Are audits useful for a newer home in north Oakville or Waterdown?
Sometimes, but the findings are different. Newer envelopes are relatively tight, so the value shows up in duct leakage, exhaust fans terminating incorrectly and an HRV that was never commissioned. Those are often cheaper to fix through a mechanical service visit than through a full evaluation.