What is the difference between an EnerGuide audit and a thermal scan in NB? | Insulation IQ?

These two assessment tools are often mentioned in the same conversation about home insulation, but they serve quite different purposes and produce very different types of information. Understanding the distinction helps New Brunswick homeowners make smarter decisions about where to spend their diagnostic dollars — and when they might benefit from using both.

An EnerGuide audit is a comprehensive, standardized home energy assessment conducted by a Registered Energy Advisor (REA) certified through Natural Resources Canada. It evaluates your entire home as an energy system: the building envelope, heating and cooling equipment, domestic hot water, ventilation, and even occupant behaviour factors like thermostat settings. The assessment includes a blower door test to quantify overall air leakage, a visual inspection of insulation levels throughout the home, and data collection on all mechanical systems. All of this feeds into HOT2000 energy modelling software, which produces your official EnerGuide rating — a score from 0 to 100 representing your home's energy efficiency relative to a standardized reference house.

The EnerGuide audit answers the question: How energy efficient is my home overall, and what will different upgrades do for that rating? It produces a quantified, modelled result with specific upgrade recommendations and projected annual savings. Critically, the EnerGuide audit is the required gateway for both the Canada Greener Homes Grant and the NB Power Home Energy Savings Program rebates. Without a pre-retrofit EnerGuide audit on file, you cannot access those incentives, regardless of how much you spend on insulation. In New Brunswick, the pre and post audit combination costs roughly $350–$550 each, with up to $600 in combined coverage available through the Greener Homes Grant.

A thermal scan (also called an infrared thermography inspection) is a diagnostic imaging tool, not a holistic energy assessment. A certified thermographer uses an infrared camera to photograph your home's surfaces — walls, ceilings, floors, windows — and capture temperature differentials invisible to the naked eye. Cold spots in walls indicate missing or settled insulation. Thermal bridges show up as linear cold streaks running along studs or joists. Air infiltration zones appear as diffuse cold patches around electrical outlets, window frames, or ceiling penetrations.

The thermal scan answers a different question: Exactly where are my insulation and air sealing deficiencies located? Rather than a score or a modelled projection, it produces a visual map of problem areas. A thermographer working on a 1,970s-era split-level in Fredericton might discover that the fibreglass batts in the bedroom walls have settled and left a 300mm gap at the top of every stud bay — a deficiency that would be invisible without the camera. This precision makes thermal scans especially valuable when preparing for targeted insulation retrofits.

There is one important caveat: thermal scans only work well under the right conditions. You need a minimum 10°C temperature differential between indoors and outdoors for the camera to detect meaningful contrasts. In New Brunswick's climate, this means thermal scans are most effective from November through March — when the Moncton and Saint John heating season is in full swing. Performing a thermal scan in July yields minimal useful data because the temperature differential across the wall assembly is too small.

Some REAs perform a basic infrared scan during the blower door test phase of an EnerGuide audit, using the depressurization to amplify air leakage signatures and make them more visible to the camera. This combined approach is the most powerful diagnostic option, but not every audit includes thermal imaging — it's worth asking your REA specifically whether infrared is part of their standard service or available as an add-on.

For most New Brunswick homeowners prioritizing the Greener Homes Grant pathway, the EnerGuide audit is the starting point — it's mandatory, it's partially subsidized, and it produces the upgrade roadmap you need. A thermal scan is most valuable as a supplementary diagnostic when you want room-by-room precision before major work begins, or when an audit has flagged a specific wall section or area as a problem zone and you want to confirm exactly where the deficiency lies before opening walls.

New Brunswick Insulation can help you navigate both assessment types and connect you with the right professionals to maximize your insulation project's effectiveness and rebate eligibility.

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• Gionetterenovations