Emergency Furnace Repair in Markham
No heat? We're here 24/7. Here's what to do while you wait — and when it's a true emergency.
The short answer: If your furnace quits in freezing weather, you smell gas, or a carbon monoxide alarm sounds, treat it as an emergency — if there's any gas or CO concern, leave the home and call your gas utility or 911 first, then call for repair. For a no-heat call with no safety hazard, Aire One provides 24/7 emergency furnace repair in Markham and can usually get your heat back the same day.
When the furnace dies on a cold Markham night, it goes from an inconvenience to an emergency fast. The good news: many no-heat calls have a simple fix, and knowing what to check — and what to leave alone — keeps your family safe while help is on the way. This guide covers when a furnace problem is a true emergency, what to do while you wait, and how quickly you can get emergency furnace repair in Markham.
If you're in the cold right now, don't wait — call 310-HEAT (310-4328) for 24/7 help, or book a repair online.
Key takeaways
- Smell gas or hear a CO alarm? Leave the home and call your gas utility or 911 before anything else.
- No heat in freezing weather is a same-day emergency — especially with infants, seniors, or pets at home.
- Quick checks (thermostat, breaker, furnace switch, filter) solve many no-heat calls.
- Aire One offers 24/7 emergency furnace repair across Markham.
- A maintenance plan is the best way to prevent the next breakdown.
Is It a Furnace Emergency?
Call for help right away if any of these are true:
- No heat while outdoor temperatures are near or below freezing.
- You smell gas (a rotten-egg odour) anywhere in the home.
- A carbon monoxide alarm is sounding, or anyone feels dizzy, nauseous, or has a headache.
- You see smoke, sparks, or smell burning coming from the furnace.
- The furnace keeps shutting itself off and won't restart.
For a gas or carbon monoxide concern, safety comes before any repair — see the steps below. A minor rattle or a slightly cool house on a mild day can usually wait for a next-day appointment, but no heat in a Markham cold snap should be handled the same day.
What to Do While You Wait
If you smell gas or a CO alarm sounds: get everyone outside to fresh air, don't touch light switches or appliances, and call your gas utility's emergency line or 911 from outside. Only return when it's declared safe. Then call for emergency furnace repair.
If there's no safety hazard, these quick checks solve many no-heat calls:
- Set the thermostat to Heat and a few degrees above room temperature; replace the batteries if it's blank.
- Check the breaker for the furnace — reset it if it has tripped.
- Make sure the furnace power switch (it looks like a light switch nearby) is ON.
- Look at the air filter — a clogged filter can shut a furnace down. Replace it if it's dirty.
- Confirm supply vents are open and clear, and keep warm layers on while you wait.
Common Causes of a No-Heat Emergency
When quick checks don't bring the heat back, the cause is usually one of these — and each needs a technician:
- Failed ignitor or flame sensor — the furnace tries to start but won't light or stay lit.
- Blower motor problem — the furnace runs but no warm air moves through the vents.
- Faulty thermostat — the furnace never gets the signal to fire.
- Safety lockout — a limit switch or pressure switch shuts the system down to protect it.
- Gas supply issue — an interrupted gas valve or supply stops combustion.
Our HVAC servicing and repairs team carries common parts, so many emergency furnace repair jobs are done in a single visit.
How Fast Can You Get Help in Markham?
Aire One has served Markham and the Metro Toronto area since 1990, with a large local team and 24-hour availability — so a no-heat call at night or on a weekend still gets answered. When our technician arrives, they diagnose the problem, explain the fix and the cost before starting, and get your heat running again as quickly as possible. That fast, local coverage is what makes reliable emergency furnace repair possible even in the middle of a cold snap. Browse all our heating and cooling services to see how we help beyond emergencies.
Preventing the Next Emergency
Most no-heat emergencies trace back to wear that a yearly tune-up would have caught. Booking annual service — ideally each fall — keeps parts clean, tested, and replaced before they fail on the coldest night. A maintenance and protection plan also adds priority booking, so you're first in line when the weather turns. Questions? Get in touch and we'll set up a schedule for your home.
No heat right now? We're available 24/7.
Trusted across Markham since 1990. Call and we'll get your heat back fast.
310-HEAT (310-4328) · 24/7 emergency service · $79 service call*
Frequently Asked Questions
What counts as a furnace emergency?
No heat during freezing weather, a gas smell, a sounding carbon monoxide alarm, or smoke and burning odours from the furnace all count as emergencies. Any gas or CO concern comes first: leave the home and call your gas utility or 911, then arrange emergency furnace repair.
What should I do if I smell gas?
Get everyone outside to fresh air right away. Do not touch light switches, thermostats, or appliances, and do not light anything. From outside, call your gas utility's emergency line or 911, and only go back in once it's declared safe.
Is no heat always an emergency?
Not always, but in a Markham winter it usually is. When outdoor temperatures are near or below freezing — or you have infants, seniors, or pets at home — treat a no-heat furnace as a same-day emergency to avoid frozen pipes and health risks.
How fast can Aire One respond in Markham?
Aire One offers 24-hour emergency service across Markham and the Metro Toronto area, so no-heat calls are answered day or night, including weekends. Our technician diagnoses the issue and explains the fix and cost before starting the repair.
How much does emergency furnace repair cost?
It starts with a $79 service call to diagnose the problem, and the technician gives you the repair price up front before any work begins. The final cost depends on the part and labour involved, with no surprises added after the fact.
Sources & Helpful Resources
- TSSA — Carbon Monoxide & Your Furnace (Ontario)
- ENERGY STAR — Heating & Cooling Guide
- Carrier Canada
Matthew leads the Aire One Markham / Metro Toronto team, helping homeowners with fast, honest heating and cooling service. Aire One has been a trusted, Carrier Factory Authorized Dealer since 1990.