Furnaces have a habit of failing at the worst possible moment, which is usually a Friday night in January with the temperature heading for -20°C. At that point you’re not comparing quotes, you’re taking whoever can get a truck to the house. Replacing on your own schedule instead of the weather’s is the single easiest way to spend less and end up with a better system.
It’s also worth remembering what a furnace actually is: a gas appliance burning fuel inside your home and venting the results outside. Get the sizing, the venting or the gas connection wrong and the consequence isn’t a higher hydro bill, it’s carbon monoxide. Every company below is licensed for gas work, and the better ones will show you combustion readings and photos of what they found rather than expecting you to take it on faith.
In no particular order, here is a list of the best Aurora furnace replacement companies:
With gas appliances, the licensing question isn’t paperwork — it’s the whole thing. NexGen is licensed and insured, an authorized Bryant dealer, and carries RenovationFind Certification, which means an independent party has verified the credit and legal history, confirmed the insurance and licensing are actually current rather than expired, and keeps monitoring for complaints afterward. Aurora falls inside their standard service area. They handle straight furnace changeouts as well as repairs, and will quote a heat pump next to a conventional furnace if you want both numbers before deciding which way to go.
Key Services & Features
– Furnace replacement and new installations
– No-heat emergency repair and diagnostics
– Heat pumps quoted as a furnace alternative
– Ductless heating and cooling systems
– Water heaters, tanked and tankless
– Filtration and indoor air quality equipment
– Licensed, insured, authorized Bryant dealer
– RenovationFind Certified with continuing third-party monitoring
Customer Feedback
“I highly recommend this company. They were very professional and didn’t disappoint when installing my brand new unit. I highly recommend reaching out to them for all your HVAC needs” — E. Afful-Quansah
— Google Review
2. T H Oliver Heating & Air Conditioning
Heating is the original business here, not a line added later. When Thomas Howard Oliver opened on Wellington Street East in 1924, keeping Aurora houses warm was the entire proposition, and the company has worked through every fuel and technology shift since — coal, oil, natural gas, and now condensing and heat pump equipment. That matters more than nostalgia when your house predates the modern gas furnace, because they’ve almost certainly retrofitted one like it before. They’re a Daikin dealer today and back every job with a written warranty, which is easier to mean when your customers live on the streets around your shop.
Key Services & Features
– Gas furnace changeouts and replacements
– Condensing furnace upgrades including venting modifications
– Seasonal heating maintenance and safety checks
– Retrofits into older homes with awkward mechanical spaces
– Fireplace supply and servicing
– Ductwork cleaning and airflow correction
– A century of local heating experience spanning the coal, oil and gas eras
– Daikin equipment backed by a written warranty
3. Marx Mechanical Heating and Cooling
Marx is family-owned with more than twenty years behind it, and the work that keeps surfacing in their reviews is the awkward stuff: replacing aging oil furnaces with high-efficiency heat pumps, matching a system to a difficult layout, sorting out a house that has never heated evenly. That’s directly relevant around Aurora, where estate and rural properties east and north of town still run oil or propane and the conversion maths is genuinely complicated. They keep a showroom, run energy audits, quote upfront, and answer emergency calls around the clock. Customers tend to name the owner, Jason, in their reviews, which is usually a sign the business hasn’t grown past its own standards.
Key Services & Features
– Furnace replacement and installation
– Oil and propane conversions to gas or heat pump
– Boilers and ductless mini-split heat pumps
– Home energy audits
– Maintenance plans and 24/7 emergency repair
– Plumbing, water heaters and tankless systems
– Showroom and transparent upfront pricing
– Family-owned, serving Aurora for over 20 years
Customer Feedback
“Here the next day to replace my furnace, in a snowstorm.”
-Google Review
4. Summers & Smith Cooling & Heating
On a furnace purchase, the thing worth knowing about Summers & Smith is how consistently their customers mention not being pushed. Furnace replacement is the job where upselling is most common — you’re already committed, it’s cold, and the difference between a mid-range and a top-tier model is thousands of dollars presented as a small monthly figure. Reviewers here describe being told what the house actually needed instead. They stock Lennox and Daikin, they’re an authorized Costco installation partner, and they hold an A+ accreditation with the Better Business Bureau. Their Industrial Parkway shop has been running since 1973.
Key Services & Features
– Gas furnace installation and replacement
– Lennox and Daikin equipment
– Heat pump retrofits into forced-air homes
– Custom ductwork for renovations and additions
– Fireplaces and tankless water heaters
– Smart thermostats and whole-home air purification
– Costco authorized installation partner
– BBB accredited with an A+ rating; Aurora-based since 1973
Customer Feedback
“The installers were very polite, professional and accommodating.”
-HomeStars Review
5. Comfort Next Heating & Cooling
If the rebate side of a furnace decision is what’s slowing you down, this is the company on the list built around it. Comfort Next has moved well past conventional heating into whole-home energy — batteries, solar, EV charging — and they’ll map which Ontario programs a heat pump upgrade qualifies for, worth up to $7,500 on eligible work. They also offer twelve months of no-payment, no-interest financing, which changes the calculation when a furnace fails before you’d budgeted for it. Family-owned, past 25 years in business, based on Industrial Parkway South and Google Guaranteed, meaning they’ve cleared background and quality checks.
Key Services & Features
– Furnace replacement, repair and rental
– Boilers and air handlers
– High-efficiency heat pump installation
– Rebate identification and application support
– Water heaters
– 12-month no-payment, no-interest financing
– Same-day service and 24/7 support
– Google Guaranteed; family-owned for over 25 years
Customer Feedback
“Bill and Hirad did a great job!”
-Google Review
What Services Do Aurora Furnace Contractors Offer?
– Gas furnace replacement sized from a measured heat loss calculation
– High-efficiency condensing furnace installation at 96%+ AFUE
– Oil and propane conversions to natural gas or heat pump
– Modulating and two-stage furnace upgrades
– Heat exchanger inspection and combustion analysis
– Venting changes, chimney liners and gas line sizing
– Emergency no-heat repair through the winter
– Annual tune-ups and carbon monoxide safety checks
– Return air and ductwork modification
– Enbridge and federal rebate applications on qualifying upgrades
Aurora throws up two furnace problems that a contractor from outside the area may not expect. The first is fuel. Plenty of estate and rural properties beyond the built-up town still run on oil or propane, and for those homeowners a furnace replacement is really a fuel decision — stay with oil, convert to gas if a line reaches the property, or move to a cold-climate heat pump and take the rebates. Those three paths have wildly different costs and payback periods, and a contractor who only fits gas furnaces will steer you toward the one they sell. The second is venting. In the older streets around Yonge and Wellington, many houses had furnaces retrofitted into basements never designed for them, sharing a masonry chimney with a natural-draft water heater. Move to a high-efficiency condensing furnace that vents through a sidewall in PVC and that water heater is suddenly alone in a flue far too large for it, which invites condensation and backdrafting. It’s solvable, but it has to be quoted, not discovered afterwards.
How Much Does Furnace Replacement Cost in Aurora?
The figures below reflect 2026 installed pricing across York Region and the north GTA. They’re for budgeting; an accurate number requires someone in your basement looking at the existing setup.
| Project |
Typical Cost Range |
| Standard-efficiency gas furnace, installed |
$3,500 – $7,500 |
| High-efficiency condensing furnace (96%+ AFUE) |
$5,000 – $10,000 |
| Mid-range furnace, what most homeowners pay |
$4,500 – $6,500 |
| Two-stage or modulating furnace upgrade |
$7,000 – $11,000 |
| Oil or propane conversion to natural gas |
$6,000 – $12,000 |
| Cold-climate heat pump conversion (before rebates) |
$8,000 – $20,000 |
| Chimney liner for an orphaned water heater |
$800 – $2,500 |
| Annual tune-up and safety inspection |
$120 – $250 |
Two numbers drive a furnace quote: BTU output, which is capacity, and AFUE, which is the share of fuel that becomes heat in the house rather than leaving through the vent. Bigger is not better on the first one. An oversized furnace fires hard, satisfies the thermostat fast, shuts off and repeats, and that short-cycling wears out ignitors and inducer motors years early while still leaving the far rooms cold. Beyond the appliance, the items that move a total are venting changes, a chimney liner if your water heater ends up orphaned, gas line sizing, return air modification, electrical, permit and disposal. Rebates are where furnace work differs from air conditioning: a like-for-like furnace swap generally earns nothing, but pairing the decision with a heat pump can unlock several thousand dollars through Enbridge’s Home Efficiency Rebate Plus. Ask for three itemized quotes, each naming model, BTU output, AFUE rating, and the parts and labour warranties written out separately.
How to Hire a Furnace Contractor in Aurora
- Find the furnace’s age before you make any calls. There’s a manufacture date on a label inside the front panel. Past fifteen years, you’re having a replacement conversation whether or not the current fault is repairable.
- Know what fuel you’re on and what’s available at the property. If you’re on oil or propane, ask every contractor to price the conversion options alongside a like-for-like replacement. The answers will differ enough to matter.
- Ask for the TSSA certification number. Gas work legally requires it. Verify liability insurance and WSIB coverage at the same time, and ask to see documents rather than accepting a nod.
- Require a heat loss calculation. Sizing based on the outgoing furnace just inherits whatever error was made last time, and you’ll live with it for two decades.
- Raise the chimney question yourself if they don’t. Ask what happens to your water heater’s venting if the new furnace vents out a sidewall. A contractor who hasn’t considered it hasn’t scoped the job properly.
- Book in spring or early autumn. Availability is better, pre-season promotions are common, and you’re negotiating rather than accepting whoever answers the phone at midnight in February.
Questions to Ask Before Hiring
Can you show me the heat exchanger, and what did you find?
A cracked heat exchanger can vent carbon monoxide into living space, and it’s the reason a furnace gets condemned rather than repaired. Any competent technician inspects it and can produce a camera image or combustion readings. Somebody declaring a crack without showing you anything is asking for a great deal of trust on a very large invoice.
Given my fuel source, what are all my options?
Especially important on Aurora’s oil and propane properties. You want gas conversion, heat pump conversion and like-for-like replacement all priced, with running costs and any rebates attached. A contractor presenting only one path may simply be presenting the only one they install.
What BTU output are you recommending, and what did you base it on?
The answer should reference a heat loss calculation using your square footage, insulation, window area and ceiling heights. Oversizing is the most common error in this trade, and it produces short cycling, premature component failure and uneven heat despite the extra capacity.
Will my venting change, and does anything else use that chimney?
High-efficiency furnaces vent through a sidewall rather than the chimney. If a natural-draft water heater was sharing that flue, it may need a liner. This should appear on the quote rather than emerging as a surprise cost mid-installation.
Is the permit included, and who handles the gas inspection?
Ontario furnace replacements require a permit, and gas work carries inspection obligations. Both belong in the written quote. Anyone offering to skip them is handing you a problem that resurfaces when you sell the house.
Frequently Asked Questions
How much does a new furnace cost in Aurora?
Most Aurora homeowners pay between $4,500 and $6,500 for a mid-range gas furnace supplied and installed in 2026. Standard-efficiency units start near $3,500, while high-efficiency condensing models rated 96% AFUE or higher generally run $5,000 to $10,000 depending on size, brand and whether venting or gas line work is needed.
Should I convert from oil to gas or to a heat pump?
It depends on whether a natural gas line reaches your property and how you weigh upfront cost against running cost. Converting oil to natural gas typically costs $6,000 to $12,000 and lowers fuel bills substantially where a gas line is available. A cold-climate heat pump costs more before rebates but qualifies for Ontario incentives worth several thousand dollars and provides cooling as well. Have a contractor price both against a like-for-like replacement.
How long should a furnace last?
A correctly sized, well-maintained gas furnace generally lasts 15 to 20 years in Ontario. Oversized units and those that never received annual servicing commonly fail sooner. Past the fifteen-year mark, any major repair — particularly to the heat exchanger or inducer motor — is worth pricing against a full replacement.
What does AFUE mean and what rating should I choose?
AFUE is Annual Fuel Utilization Efficiency, the percentage of fuel converted to usable heat rather than lost through venting. Condensing furnaces reach 96% or higher. Given how long Aurora’s heating season runs, the premium for a high-efficiency model usually pays back through lower gas bills across the furnace’s lifespan.
Do I need a permit to replace a furnace in Aurora?
Yes. Furnace replacements in Ontario require a building permit, and the gas work must be carried out by a TSSA-certified technician. Your contractor should obtain the permit, arrange any inspection, and show the cost on your quote.
What is an orphaned water heater?
When an older furnace and a natural-draft water heater share a masonry chimney and the furnace is replaced with a high-efficiency model venting out a sidewall, the water heater is left alone in a flue sized for two appliances. The reduced exhaust volume can cause condensation and backdrafting. The usual fix is installing a properly sized chimney liner, which should be identified and quoted before the furnace work begins.
Choosing a contractor for your furnace replacement in Aurora
A furnace is a fifteen-to-twenty year commitment and a fuel-burning appliance, which puts installation quality in a different category from most home improvements. Correct sizing, sound venting and a properly made gas connection determine whether the house heats evenly and whether the appliance is safe to run. The name on the cabinet matters far less than the person who fitted it.
This is where hiring a RenovationFind Certified company helps. Certification isn’t something a business can purchase. It means the company has passed financial and credit background checks, supplied proof of current municipal licensing and business insurance, confirmed WSIB coverage, and agreed to ongoing third-party monitoring for customer complaints. On gas work especially, an independent standard is worth considerably more than a confident sales visit.
Ready to get started? Post your project and connect with trusted furnace replacement companies serving Aurora.
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This post first appeared on https://blog.renovationfind.com