Furnace
Repair + Maintenance
Toronto winters don’t wait, and when your furnace stops working, neither do we. At Sunnyside Heating and Air Conditioning, we provide fast, honest, expert furnace repairs and maintenance for homeowners across East York and surrounding Toronto neighbourhoods.
With over 25 years of experience and deep knowledge of Toronto’s older homes, we diagnose furnace issues quickly and fix them right the first time. As a small, owner-run business, we take the time to explain what’s happening, what it will cost, and how to prevent future breakdowns.
Our furnace repair services.
✔ Furnace won’t turn on?
✔ No heat or inconsistent heat?
✔ Blower constantly running?
✔ Loud noises (banging, rattling, scraping)?
✔ Short cycling (turning on/off quickly)?
✔ Thermostat issues?
✔ Poor airflow?
✔ Carbon monoxide or safety concerns?
✔ Ignition problems?
When something goes wrong with your furnace, our licensed technicians diagnose the problem quickly and get your heat back on safely.
East York homes, especially older semis and bungalows, often have aging ductwork or legacy heating systems. We work with these systems every day and know exactly how to diagnose their quirks.
When should you repair vs. replace?
Your may want to repair your furnace if:
It’s under 12–15 years old
The repair is minor
Your furnace previously had few issues
Replacement parts are readily available
You may want to consider replacement if:
The repair is costly and the furnace is 15–20+ years old
You’ve had multiple breakdowns
Your heating bills keep rising
Your home has uneven heat
You want higher efficiency or quieter operation
If replacement makes more financial sense, we’ll explain your options clearly - including Lennox high-efficiency models.
What to expect from our furnace repairs.
✔ Clear diagnostic and honest expectations
✔ Transparent and upfront pricing
✔ Repair-first approach - no pressure to replace
✔ Same day or next-day service
✔ Fully licensed and insured work
✔ Service for many makes and models
Want modern comfort without replacing your boiler?
Ductless and hybrid heat pumps can supplement your existing system - providing year-round heating and cooling with lower energy bills.
Frequently asked questions about furnace installation.
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If your furnace is older than 15–20 years, needs frequent repairs, or struggles to maintain heat during a Toronto freeze, it may be time to replace.
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A typical furnace install takes most of a day, depending on how much prep work is needed (e.g., duct modifications, venting, or removing the old unit).
Our Boiler Maintenance Services Include:
Safety inspection of valves, pipes, and combustion systems
Pressure and temperature checks
Cleaning and servicing of burners, heat exchangers, and controls
Testing for leaks, corrosion, or efficiency issues
Recommendations for repairs or upgrades if necessary
Benefits of regular maintenance:
Reduced chance of mid-winter breakdowns
Lower energy bills
Longer lifespan for your boiler
Safer operation for your home and family
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Absolutely. We specialize in Toronto-area homes, including older and heritage properties, and know how to navigate their unique heating challenges.
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We safely decommission and remove it. We follow environmental protocols and make sure everything is properly disposed of.
Contact us
Ready to upgrade your furnace and stay cozy all winter? Contact Sunnyside Heating and Air Conditioning today for a free, in-home consultation.
We’ll help you choose the right system, walk you through our installation process, and give you a solid quote - no surprises, just dependable heat.
Contact us today to schedule your consultation or service.
416-573-7212 | info@sunnysideHVAC.ca