What ProScore's HVAC Data Reveals About Contractor Credentials

Of the 1,350 Ontario HVAC contractors scored in the ProScore corpus, only 409 carry a verified WSIB registration — meaning the majority of scored HVAC businesses cannot demonstrate this foundational credential through our data sources. For homeowners booking furnace replacements, heat pump installs, or air conditioning service, that gap matters more than most people realize.

What the Numbers Actually Show

ProScore's Trust Index draws on 10+ data sources and 20+ trust signals to score contractors. When our data team pulled a cross-fleet snapshot of the 1,350 HVAC contractors currently scored on the platform, one finding stood out: fewer than one in three carries a verifiable WSIB registration.

To be clear about what this measures — and what it does not. A contractor absent from the WSIB database is not automatically operating illegally. Sole proprietors with no employees are not required to register with WSIB under Ontario law; they can instead carry their own private workplace insurance. Some small owner-operators fall into this category legitimately.

But for any HVAC company with employees or subcontractors working on your property, WSIB registration is not optional. Without it, Ontario homeowners can be held liable for injuries that occur on their premises. That is the real-world stakes behind a data point that might otherwise look like a technicality.

The 409 contractors who do carry verifiable WSIB registration represent the portion of the HVAC market where this credential can be confirmed through public records. The rest either operate as sole proprietors with private coverage, have a lapse in their registration, or simply have not made their status easy to verify.

Why HVAC Credential Verification Is Harder Than It Looks

HVAC sits at the intersection of multiple Ontario regulatory regimes, which makes it one of the more complex trades to verify.

Gas work is governed by the Technical Standards and Safety Authority (TSSA). Any contractor installing, servicing, or repairing natural gas or propane equipment must hold a valid gas technician licence — G1 or G2 — issued by TSSA. You can confirm a technician's gas licence on the TSSA public registry.

Refrigerant handling for air conditioning and heat pump systems requires certification under Environment and Climate Change Canada's regulations. Technicians must hold a valid refrigerant handling certificate; this is a federal requirement, not a provincial one.

Electrical connections tied to HVAC equipment — wiring a new heat pump, connecting a furnace control board — fall under the Electrical Safety Authority (ESA). That work must be done by a licensed electrical contractor or a licensed electrician, and typically requires an ESA permit.

WSIB sits on top of all of this. It covers workers, not the work itself. A contractor can be fully licensed under TSSA and ESA and still leave you exposed if they have employees and no WSIB coverage.

Most homeowners check none of these. Many check one. Very few check all four.

That layered complexity is part of why ProScore exists — to aggregate signals from multiple sources into a single, readable score so you are not manually navigating four separate government registries before booking a service call.

What Verified Credentials Signal About a Business

Carrying verifiable credentials is not just a compliance exercise. It is a signal about how a business operates.

A contractor who registers with WSIB, maintains their TSSA gas licence in good standing, and keeps their business information current across public databases is demonstrating something about their organizational habits. They are tracking renewal dates. They are paying premiums. They are maintaining records. These are the same habits that tend to produce careful, documented work on your home.

The inverse is also telling. Contractors who let credentials lapse, operate under expired licences, or cannot be found in public registries at all are signalling something too — even if the work they do is sometimes perfectly fine.

ProScore's Trust Index reflects this. Verified credentials are one of the four qualitative inputs — alongside reputation, customer sentiment, and business transparency — that shape a contractor's score. The platform does not publish the internal mechanics of how those inputs combine, but the principle is straightforward: a contractor who can be verified across multiple dimensions earns a higher level of confidence than one who cannot.

The tier labels — Elite, Trusted, Good, Basic, and Caution — give homeowners a fast read on where a contractor lands without requiring them to interpret raw data.

The Regional Picture Across Ontario

Ontario's HVAC market is not uniform. Demand patterns, contractor density, and the mix of heating systems vary considerably from the GTA to northern and rural communities.

In dense urban markets like Toronto, Mississauga, and Brampton, the volume of scored contractors is higher, and competition tends to push credentialled businesses to make their qualifications visible. Homeowners in these markets have more options and more data to work with. You can browse HVAC contractors in Toronto, HVAC contractors in Mississauga, or HVAC contractors in Brampton to see scored results for your area.

In mid-size markets — Hamilton, London, Ottawa — the field is smaller but still competitive. HVAC contractors in Ottawa and HVAC contractors in Hamilton both return scored results with credential signals visible.

In smaller communities, the credential picture can be thinner simply because there are fewer contractors and fewer data points. That makes independent verification — calling TSSA, checking WSIB's online employer lookup — more important, not less.

One consistent pattern across the province: contractors who actively manage their ProScore profile and keep their credential information current tend to score higher. That is not a coincidence. It reflects the same organizational discipline that produces verifiable credentials in the first place.

What This Means If You Are Hiring an HVAC Contractor Right Now

The 409-out-of-1,350 figure is a starting point for a conversation, not a verdict. Here is how to use it practically.

Start with the ProScore tier. An Elite or Trusted rating reflects strong signals across reputation, credentials, customer sentiment, and business transparency. It does not guarantee perfection, but it narrows the field meaningfully.

Confirm WSIB status independently. WSIB maintains a public online tool where you can enter a contractor's business name or registration number and confirm active coverage. For any company with employees working in your home, this step takes two minutes and can save you significant legal exposure.

Ask about gas licences. Request the technician's TSSA gas licence number and verify it on the TSSA public registry before work begins. A legitimate contractor will not hesitate.

Check for ESA permits on electrical work. If your HVAC installation involves new electrical connections — common with heat pump installs — confirm that an ESA permit will be pulled. Unpermitted electrical work creates problems at resale and may void your home insurance.

Get it in writing. Scope of work, equipment model numbers, warranty terms, and payment schedule should all be in a signed contract before any work begins.

The HVAC cost guide for Ontario covers what typical installation and service calls cost across the province, which helps you assess whether a quote is reasonable before you commit.

For a broader look at how ProScore scores contractors across all trades, the methodology page explains the Trust Index inputs without getting into proprietary detail.

FAQ

What percentage of Ontario HVAC contractors carry verified WSIB registration?

Of the 1,350 HVAC contractors scored in the ProScore corpus, 409 carry a verified WSIB registration. ProScore does not extrapolate this figure to the broader Ontario market — it reflects what is verifiable within our scored dataset across 10+ data sources.

Is a WSIB registration required for all HVAC contractors in Ontario?

Not for every business structure. Sole proprietors with no employees are not required to register with WSIB under Ontario law and may carry private workplace insurance instead. However, any HVAC company that employs workers or subcontractors must have WSIB coverage — and without it, the homeowner can be held liable for on-site injuries.

How do I check if an HVAC contractor is properly licensed in Ontario?

You should verify at least three things: a TSSA gas technician licence (for any gas work) via the TSSA public registry, WSIB registration via WSIB's online employer lookup, and an ESA permit for any electrical connections. ProScore's Trust Index aggregates credential signals from 10+ sources, giving you a starting point — but independent verification of these registries before work begins is always recommended.

Browse HVAC contractors across Ontario to see ProScore ratings and credential signals for contractors in your area. If you are an HVAC contractor who wants your verified credentials reflected in your score, claim your profile to ensure your information is current.