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By Mario Vaghei, General Manager, Aire One Peel Heating & Cooling · Published August 4, 2026 · Facts verified August 4, 2026
When your furnace isn’t working on a cold night, a dead furnace narrows your attention fast, so this page is built in the order you need it: safety first, then the ten-minute checks that fix a surprising share of no-heat calls without a truck, then exactly who to call for everything the checks cannot fix. Aire One Peel’s furnace repair line runs 24/7 with no after-hours charge, and the honest goal of this page is that you only need it when you actually do.
In this guide
Is this an emergency? ·
The ten-minute checks ·
Symptom to likely cause ·
Who handles what ·
What a repair visit costs ·
FAQ
Short answer
If you smell gas or a carbon monoxide alarm is sounding, leave the house first and call 911 and Enbridge Gas’s emergency line from outside; for an ordinary no-heat furnace, run five ten-minute checks, then call a TSSA-registered fuels contractor, which in Mississauga includes Aire One Peel’s 24/7 line with no after-hours charge.
The checks below fix a real share of no-heat calls for free, and everything they cannot fix belongs to a certified gas technician through furnace repair at 905-564-8545.
First: is this an emergency?
Three symptoms skip every checklist on this page, because they are safety events rather than repair calls. Everything else can wait ten minutes for the checks below.
Leave first, call from outside: a rotten-egg gas smell, a sounding carbon monoxide alarm, or a strong persistent burning smell means everyone leaves the house before any phone call. From outside, call 911 and Enbridge Gas’s 24/7 emergency line, the number on your gas bill and at enbridgegas.com, and do not re-enter or operate switches until cleared. Ontario expanded CO alarm requirements under O. Reg. 87/25 effective January 1, 2026; keep alarms working and test them monthly. Furnace repair comes after the home is confirmed safe, and our emergency line handles it from there.
The ten-minute checks before you call anyone
A meaningful share of no-heat calls end at one of these five checks, and every one of them is safe for a homeowner. Run them in order before spending a cent.
| Check | What to do |
|---|---|
| 1. Thermostat | Set to heat, temperature above room, fresh batteries |
| 2. Power | Furnace switch on (it looks like a light switch), breaker not tripped |
| 3. Filter | Swap a clogged filter; a starved furnace locks itself out |
| 4. Outdoor pipes | Clear snow, ice, or debris from the sidewall intake and exhaust |
| 5. Reset once | Power off 60 seconds, back on, one attempt only |
Safe homeowner checks only; if the furnace locks out again after one reset, stop and call, because repeated resets can mask a safety shutdown that exists for a reason.
Symptom to likely cause
What the furnace is doing narrows what is wrong, and knowing the likely cause before you call makes every conversation faster. These are the patterns behind most Mississauga no-heat calls.
| Symptom | Likely cause | Urgency |
|---|---|---|
| Completely dead, no display, no fan | Power: switch, breaker, or board | Same day in winter |
| Fan runs, air is cold | Ignition, flame sensor, or gas valve | Same day in winter |
| Starts, then shuts off in minutes | Clogged filter, blocked vent, or overheat lockout | Checks first, then call |
| Heats but weakly or unevenly | Filter, ducts, or a failing blower | Book soon |
| Banging, screeching, or new smells | Mechanical wear; burning smells escalate | Book soon, sooner if it worsens |
| Gas smell or CO alarm | Safety event, not a repair symptom | Leave, 911 and utility now |
Patterns reflect common failure modes on high-efficiency gas furnaces; the same symptom can trace to different failures, so the on-site diagnosis governs.
Who handles what: the routing table
“Who do I call” has five different answers in Ontario depending on the situation, and calling the right one first saves hours. This is the routing that applies across Mississauga and all of Peel Region.
| Situation | Who to call |
|---|---|
| Gas smell, CO alarm, strong burning smell | 911 and Enbridge Gas emergency, from outside |
| Furnace mechanical failure, no heat | A TSSA-registered fuels contractor, 24/7 |
| Whole-home power problem or panel issue | A licensed electrician under ESA rules |
| No gas supply to the whole house | Enbridge Gas |
| Thermostat setting, filter, blocked vent | Yourself, using the checks above |
Routing per Ontario’s trade and utility structure; it applies identically across Mississauga, Brampton, Etobicoke, Milton, Georgetown, Caledon, and Bolton.
For the furnace itself, the credential to verify is simple: gas furnace repair in Ontario must be done by certified gas technicians working through a TSSA-registered fuels contractor, and any legitimate company will give you its registration number without hesitation, ours is FS R0076624709, checkable with TSSA.
Beyond the licence, the things worth asking any Mississauga repair company at 9pm are whether after-hours carries a surcharge, whether the diagnosis comes in writing with the failed part named, and whether a repair-versus-replace opinion comes with prices for both.
We answer yes, yes, and yes, and so should anyone else you shortlist; our furnace repair service runs 24/7, availability-based, with no after-hours charge, and a rental-first company like Reliance remains a fair alternative if bundled maintenance under a rental agreement is what you want.
What a repair visit costs, roughly
Knowing the normal bands protects you from panic pricing at midnight when your furnace isn’t working. When your furnace isn’t working, a diagnostic visit in the GTA typically runs $100 to $150 CAD, common furnace repairs, ignitors, flame sensors, blower components, typically land between $200 and $1,500 CAD depending on the part, and anything approaching a heat exchanger or repeated major failures on an old unit becomes a replacement conversation instead, where a free estimate prices a furnace installation beside the repair. The cheapest call of all is the one prevention makes unnecessary, which is the whole argument of our guide on how often to get your furnace serviced.
If it is a genuine after-hours no-heat emergency, go straight to our emergency furnace repair in Mississauga page for the 24/7 line and what to expect on the call.
Who should you call? A 20-second triage
Two questions, same routing as the tables above.
What is happening?
The triage needs JavaScript; the routing table above gives the same answers.
How we know this
Compiled by Mario Vaghei from common gas furnace failure modes, TSSA registration and certification requirements, Enbridge Gas emergency guidance, ESA licensing rules, and typical GTA service pricing, checked August 2026.
Checks done and the house is still cold?
One call, 24/7, availability-based, no after-hours charge, written diagnosis. Aire One Peel Heating & Cooling, TSSA-registered fuels contractor FS R0076624709, 1625 Courtneypark Dr E, Mississauga, ON L5T 1V9.
Furnace isn’t working: frequently asked questions
Who do I call when my furnace stops working in Mississauga?
For a mechanical no-heat failure, call a TSSA-registered fuels contractor whose certified gas technicians handle furnace repair; Aire One Peel’s line at 905-564-8545 runs 24/7 with no after-hours charge. For a gas smell or CO alarm, leave the house and call 911 and Enbridge Gas’s emergency line from outside instead, before any repair company.
What should I check before calling a furnace repair company?
Five things, in order: the thermostat is on heat and set above room temperature, the furnace switch and breaker are on, the filter is not clogged, the outdoor intake and exhaust pipes are clear of snow and debris, and one single power reset. These take about ten minutes, cost nothing, and resolve a real share of no-heat calls without a visit.
When is a broken furnace an emergency?
Immediately when there is a gas smell, a sounding carbon monoxide alarm, or a strong persistent burning smell: leave the house and call 911 and Enbridge Gas’s emergency line from outside. A complete no-heat failure in freezing weather is also urgent, both for your household and because an unheated house risks frozen and burst pipes within a day or two.
How much does an emergency furnace repair visit cost in Mississauga?
A diagnostic visit typically runs $100 to $150 CAD in the GTA, and common furnace repairs land between $200 and $1,500 CAD depending on the failed part, as typical market ranges in August 2026. After-hours surcharges vary by company and are worth asking about before booking; Aire One Peel charges no after-hours premium on its 24/7 line.
Who do I call if I smell gas in Mississauga?
Leave the house first, then call 911 and Enbridge Gas’s 24/7 emergency line from outside; the number is on your gas bill and at enbridgegas.com. Do not operate light switches, phones, or appliances inside, and do not re-enter until emergency services or the utility confirms the home is safe. Furnace repair only begins after that clearance.
Can I fix my furnace myself?
You can safely handle the thermostat, the power switch and breaker, the filter, the outdoor pipe clearance, and one reset, and nothing beyond that. The gas train, burners, ignition, and venting are regulated work for certified gas technicians through a TSSA-registered fuels contractor in Ontario, and repeated resets to force a locked-out furnace to run defeat a safety shutdown that exists for a reason.
Final verdict
Who you call in Mississauga when the furnace dies depends on the symptom: 911 and Enbridge Gas from outside for anything involving gas or a CO alarm, yourself for the five ten-minute checks, an ESA-licensed electrician for whole-home power problems, and a TSSA-registered fuels contractor for everything the furnace itself needs. When it lands in that last category, our furnace repair line at 905-564-8545 answers 24/7 with no after-hours charge, and the visit ends with the honest fork in writing: the repair price, and when the unit’s age warrants it, the replacement price beside it.
Sources and references
Technical Standards and Safety Authority (TSSA), fuels contractor registration and gas technician certification, CO alarm requirements incl. O. Reg. 87/25
Enbridge Gas, natural gas emergency guidance and emergency line
Electrical Safety Authority (ESA), licensed electrical work requirements
Health Canada, carbon monoxide safety guidance
Mario Vaghei
General Manager, Aire One Peel Heating & Cooling
Mario compiled this triage guide from common furnace failure modes, TSSA and ESA requirements, and utility emergency guidance, verified in August 2026.