Should my HVAC technician be licensed and insured in Ontario?

When someone is working on the gas-fired equipment that heats your home, credentials aren't a formality — they're a legal requirement and a safety line. Ontario regulates gas work tightly, and hiring outside that system can cost you far more than you saved. Here's exactly what to look for and how to check.

The credentials that matter

• TSSA gas licence — the Technical Standards and Safety Authority licenses gas technicians in Ontario. A G2 can work on appliances up to a certain input rating; a G1 is the full licence. Anyone touching your gas furnace must hold one
• Liability insurance — covers damage to your property if something goes wrong during the work
• WSIB coverage — protects you from liability if a worker is injured on your property
• Refrigerant handling certification — required for anyone working on AC or heat-pump refrigerant

Permits are part of doing it right

Furnace and AC replacements require municipal permits in most GTA cities, and a licensed contractor pulls them as a matter of course rather than asking you to skip them. A permit means an inspector verifies the work is safe — it protects you, not just the city. See do I need a permit to replace a furnace for the specifics.

How to verify before they start

• Ask to see the technician's TSSA card — legitimate techs carry it and won't mind showing it
• Confirm the company name on insurance and WSIB matches who's billing you
• Ask whether they'll pull the permit — the right answer is yes, included
• Check that quotes are itemized and in writing, a sign you're dealing with a real licensed business; more in how to choose an HVAC contractor

The real risks of unlicensed work

• Safety — improper gas or venting work can cause gas leaks or carbon-monoxide hazards
• Voided warranties — most manufacturers void equipment warranties if installed by an unlicensed party
• Insurance trouble — your home insurer can deny a claim tied to unpermitted or unlicensed gas work
• No recourse — an uninsured, cash-only operator who botches the job leaves you paying twice to fix it

ZK Mechanical's technicians are TSSA-licensed and the company is fully insured and WSIB-covered, and we pull the permits your install requires across the GTA and Hamilton — see why a licensed, insured contractor matters. Request a free quote and we'll show you the credentials before we show you the price.