EnerGuide evaluations explained for Canadians sequencing electrification work

What to take away

• Home electrification works best when an EnerGuide evaluation, not a contractor's sales pitch, sets the order of work.
• The EnerGuide rating runs from 0 to 100, and every point reflects measured performance, not modelled guesses alone.
• The blower door test produces the airtightness figures that tell you whether insulation and air sealing should come before a heat pump.
• Pre- and post-retrofit evaluations are the pair of reports that prove what changed and support NRCan grants.
• Sequence envelope work first, then mechanical systems, then renewables, and keep the paperwork for each stage.

What an EnerGuide rating measures and what the number means

An EnerGuide rating is a score out of 100 for a whole house, produced by a certified energy advisor who inspects the home and runs a software model of it. Natural Resources Canada sets the framework, the labels and the quality control behind those evaluations.

A new house built to a modern code typically lands in the 80s or low 90s. An older house with original insulation, single-pane windows and a mid-efficiency furnace often sits in the 40s or 50s. A score of 0 represents a house with no meaningful efficiency measures at all.

The number is not a bill forecast. It is a relative measure of how the house performs as a system, so two homes with the same score can have different utility costs if one is in Vancouver and the other in Winnipeg.

That is why the report pairs the rating with modelled energy use, usually broken into space heating, water heating, ventilation, lighting and appliances. Those lines show where the energy actually goes.

Gigajoules are the unit you will see most often in the report. One gigajoule is roughly the energy in 27 litres of gasoline, which helps when you compare a furnace line against a water heater line.

What the rating does not capture matters too. It says little about comfort complaints, moisture problems or the age of equipment, all of which affect what you should fix first.

Read the rating as a baseline. Its value comes from the second evaluation, run after the work, which shows whether the house moved and by how much.

The blower door test and airtightness figures explained

A blower door test measures how much air leaks through the envelope of the house. A technician mounts a calibrated fan in an exterior door, depressurizes the house and records the airflow needed to hold a set pressure difference.

The result is reported as air changes per hour at 50 pascals, written ACH50. It answers a simple question: how many times per hour would the entire volume of indoor air be replaced through leaks at that pressure?

Older Canadian houses commonly land between 4 and 8 ACH50. A well-sealed modern house is often under 3, and highly airtight builds go below 1.5. The lower the figure, the less conditioned air escapes.

Airtightness figures are the most useful single number in the report for sequencing decisions. A leaky house loses heat through the envelope faster than a heat pump can replace it efficiently, so the equipment runs harder and longer.

Leakage also drives comfort problems. Cold floors, drafts near outlets and uneven room temperatures usually trace back to air movement rather than to the furnace or boiler.

The test is repeated after air sealing work. That second blower door test is what demonstrates the improvement, and it is often required for grant claims tied to envelope measures.

One caution: airtightening a house changes how it handles moisture and combustion air. Any plan that pushes ACH50 down sharply should include ventilation review, especially where a natural-draft gas appliance remains in place.

How to read the report before you sequence any work

The report is a modelling document, so it rewards careful reading rather than skimming. Start with the rating and the ACH50 figure, then move to the end-use breakdown.

Look for the improvement table. Most reports list recommended measures with a modelled rating gain and an estimated cost for each. That table is the raw material for ranking electrification projects by urgency and payback.

Check the assumptions. The model uses a set of utility rates, thermostat settings and occupancy patterns. If your household runs warmer, works from home or heats a basement that the model treats as unconditioned, the numbers will drift.

Note what the advisor flagged as health and safety items. These are not optional upgrades, and they can change the order of everything else.

Here is a workable reading order:

1. Confirm the rating and the ACH50 figure.
2. Read the end-use breakdown to find the largest energy line.
3. Read the recommended measures table and the modelled gain for each.
4. Note health and safety items and any ventilation warnings.
5. Check the assumptions against how your household actually lives.

Once you have that, you can plan a sequence that accounts for future-ready electrification, meaning work that will not have to be redone when the next upgrade arrives.

Using EnerGuide results to prioritize insulation, windows and heat pumps

Envelope first is the general rule, and the report usually supports it. Insulation and air sealing reduce the load that every later system has to meet.

Attic insulation is often the cheapest gain per dollar, particularly in older Ontario and Prairie homes where the attic was topped up decades ago. Basement and crawlspace insulation follows where the report shows high losses.

Windows sit lower on the list than most homeowners expect. Replacement is expensive per unit of energy saved, so it usually makes sense when windows are at end of life or when comfort complaints are concentrated in one room.

Air sealing is the quiet winner. Weatherstripping, rim joist sealing and outlet gaskets cost little, and their effect shows up directly in the ACH50 figure from the next blower door test.

Heat pumps come after the envelope, not before. A house that has been sealed and insulated needs a smaller heat pump, which lowers the purchase price and improves cold-weather performance.

Cold-climate heat pumps now carry rated capacity well below freezing, and they are common in British Columbia, Quebec and the Atlantic provinces. Sizing still depends on the load the envelope leaves behind.

Water heating is a separate decision. A heat pump water heater works well in a basement with headroom and mild ambient temperatures, but it cools the space around it, which matters in a finished basement.

If you are weighing scope, Whole-home, staged or equipment-only sets out how each approach handles the same report findings.

A worked example makes the logic concrete. Suppose a 1965 Toronto bungalow scores 48 with 6.5 ACH50. The report shows space heating as the dominant end use.

A staged plan would air seal and top up attic insulation first, then re-test. If the rating rises and ACH50 falls to about 3, the next step is a cold-climate heat pump sized to the new load, followed later by a heat pump water heater.

A different house gives a different answer. A 1998 Halifax home already at 2.5 ACH50 with decent insulation may gain little from more envelope work, so the heat pump and water heater move to the front.

That is the point of the report: it tells you which house you have, not which upgrades are fashionable.

Qualifying for NRCan grants with an EnerGuide evaluation

Federal grant programs have been built around EnerGuide evaluations for years, and the pattern is consistent. You complete a pre-retrofit evaluation, do the work, then complete a post-retrofit evaluation.

The pre-retrofit report establishes the baseline and lists eligible measures. The post-retrofit report proves what was installed and how the house performed afterward. Both are typically required before any money moves.

Natural Resources Canada publishes the current program details and eligibility rules, and they change between funding rounds. Check the federal home energy efficiency guidance before you commit to a scope.

Rebates are usually tied to specific measures rather than to the rating gain, so a measure can be eligible even if its modelled impact looks modest. Read the eligible measures list against your report's recommendation table.

Some measures require a licensed trade and a permit. Heat pump installations, for example, generally need an electrical permit and a licensed installer, and the paperwork must match the invoice.

Stacking rules matter. Federal money may combine with provincial or utility rebates in some cases and not in others, so confirm the order of application before signing a contract.

Utility programs vary by province. BC Hydro and FortisBC run their own offers in British Columbia, Efficiency Nova Scotia runs programs in Nova Scotia, and Ontario has moved through several rebate designs, including an Enbridge Gas linked home energy rebate stream.

Keep every document. Invoices, model numbers, permits and both evaluation reports are what an auditor will ask for if a claim is reviewed.

Program budgets are finite and can pause. Starting the pre-retrofit evaluation early keeps you in a position to claim when a window opens.

NRCan also maintains program and code context for buildings that shapes what provinces adopt into their own building codes.

There is also a tax side. The Canada Revenue Agency administers credits such as the multigenerational home renovation tax credit and the home accessibility tax credit, which can apply to renovation work done alongside efficiency upgrades. They are separate from NRCan grants and have their own rules.

Booking pre- and post-retrofit evaluations and what changes between them

Evaluations are delivered by energy advisors licensed under the EnerGuide framework, often working through regional delivery organizations. Availability varies widely by region, and rural areas can have longer waits.

Book the pre-retrofit evaluation before you sign any retrofit contract. The baseline has to reflect the house as it was, and work done before the visit can complicate the file.

Expect the visit to take a few hours. The advisor measures the house, inspects insulation levels, checks windows and doors, photographs equipment nameplates and runs the blower door test.

You receive a report and a label. The label is the public-facing summary; the report is the working document with the modelling detail.

Between the two evaluations, keep a record of what was installed and when. Photograph nameplates and keep the receipts in one folder.

The post-retrofit evaluation repeats the same measurements, including a second blower door test where airtightness work was done. Comparing the two reports is where the value sits.

What changes between them is not just the rating. Airtightness figures should move, end-use lines should shift, and the recommended measures list should shrink or change character.

If the second report shows little movement, that is useful information. It usually means the work addressed a small end use, or that the modelling assumptions absorbed the gain.

For a broader view of how the stages fit together, the start-to-finish guide walks through phase by phase planning.

Budget for the evaluations themselves. They are a real cost, though they often bring back more in rebates than they cost, and they are the gate to most federal and utility money.

One practical note for colder provinces: schedule the blower door test when outdoor temperatures are moderate. Extreme cold or wind can affect the test conditions and the advisor's ability to complete the visit.

If you are working through the money side, an electrification budget helps you decide how much to hold back for evaluations, permits and contingency.

Common questions

Is an EnerGuide evaluation mandatory for federal grants? In practice, yes for the programs built around it. The pre- and post-retrofit reports are the evidence base, and claims are assessed against them.

How long is an EnerGuide report valid? Validity is set by the program rules in force when you apply, not by the report itself. Confirm the current window before you schedule work.

Can I do the work myself? Some air sealing and insulation tasks are within reach for a careful homeowner, but many rebates require licensed trades and permits. Check the eligible measures list first.

What ACH50 should I aim for? There is no single target. A move from 6 to 3 is a large improvement for most older houses, and pushing below 2 usually brings ventilation requirements with it.

Do I need a new evaluation after every upgrade? No. One post-retrofit evaluation can cover a group of measures completed in the same period, provided the documentation covers each one.

Does the rating affect my home's resale value? A documented improvement gives buyers a measured baseline and a record of work. How much that is worth varies by market and by how well the paperwork is organized.