How Much Does It Cost to Replace a Furnace in Toronto? (2026)

A new furnace replacement in Toronto typically costs between $4,000 and $7,500 installed, with premium modulating systems reaching $8,000 or more. The final price depends on the furnace's efficiency, its size, and what your specific install involves and knowing that range ahead of time is how you spot a fair quote from an inflated one.

This guide breaks down the real cost to replace a furnace in Toronto in 2026: what drives the price up or down, when replacing beats repairing, which rebates apply, and how to avoid overpaying.

What actually drives the cost

Efficiency and furnace type

This is the biggest single factor. A basic single-stage furnace costs less upfront but modulates less and can run less efficiently day to day. A two-stage or fully modulating, variable-speed furnace costs more but delivers steadier comfort and lower running costs. Our guides on types of furnaces and the pros and cons of a two-stage furnace explain the trade-offs.

Size (BTU output)

A furnace has to match your home's heating load. Too small and it can't keep up in an Ontario winter; too large and it short-cycles and wastes fuel. Sizing is done with a load calculation, not a guess — see how to choose the right furnace size based on BTUs and AFUE and what a Manual J calculation is. Larger, higher-output furnaces cost more.

Your home's existing setup

Installation complexity can swing the price meaningfully. Factors include:

• Whether new venting is required (older mid-efficiency to high-efficiency conversions often need it)
  
• Ductwork changes or a new return
  
• Gas line or electrical adjustments
  
• Removal and disposal of the old unit
  
• Whether a new thermostat is included

A straightforward like-for-like swap sits at the lower end; a conversion with venting and duct work sits higher.

Labour and the company

A licensed, insured company with TSSA-certified technicians carries real overhead — and real accountability. A rock-bottom quote sometimes reflects skipped permits, a rushed install, or an unlicensed operator, which can cost you far more later. Understanding why furnace and AC quotes vary so much helps you read the difference.

Repair or replace? When a new furnace makes sense

If your furnace is under 10 years old and the repair is minor, fixing it is usually the better call. Replacement tends to make sense when:

• The furnace is 15-plus years old
  
• Repairs are getting frequent or expensive
  
• Your energy bills are climbing
  
• The heat exchanger is cracked (a safety issue)

Our guides on whether to repair or replace your furnace and the five signs your old furnace is costing you more than a new one would help you make the call before the cold forces it.

Don't forget rebates

Rebates can meaningfully offset the cost of an efficient upgrade, especially if you're considering a heat pump alongside or instead of a furnace. Our 2026 Ontario heat pump rebate guide covers what's available. Because programs and amounts change, confirm current eligibility before you buy, and ask your installer which rebates apply to your equipment. For many Ontario homes, pairing a heat pump with a high-efficiency furnace is worth pricing out — see why Ontario homes run better with that combination.

How to avoid overpaying

• Get more than one itemized quote, and compare scope, not just the total.
  
• Insist on proper sizing via a load calculation.
  
• Confirm what's included - permit, removal, venting, thermostat, warranty.
  
• Check licensing and insurance, and that technicians are TSSA-certified.
  
• Be wary of pressure tactics. A furnace failure is stressful, and some companies exploit that. Watch for the patterns behind the red tag scam.
  
• Ask about payment options. Spreading the cost with a flexible plan can beat draining savings.
  

A note on paying for it

A furnace is a big, often unexpected expense. Flexible payment options exist so you don't have to choose between a rushed cheap install and an empty bank account. Go Lime's Go Flex plans spread the cost with transparent terms, and every install is backed by a 30-day money-back guarantee. You can explore furnace options here or contact our experts to guide you.

Bottom line

A furnace replacement in Toronto in 2026 generally runs from around $4,000 for a basic high-efficiency model to $8,000 or more for a premium modulating system, driven mostly by efficiency, size, and install complexity. The smartest way to control the cost isn't chasing the lowest number — it's getting itemized quotes, confirming proper sizing, and stacking any rebates you qualify for.