What it costs in the GTA
| Job | Typical range |
|---|---|
| Gas furnace, mid-efficiency, installed | $4,500–$7,000 |
| High-efficiency furnace (96%+ AFUE), installed | $5,500–$9,000 |
| Furnace + central AC together | $8,000–$15,000 |
| City of Toronto permit (house) | $214.79 |
Typical GTA ranges before HST. Bigger homes, new venting or moving the unit push the price up. Ranges where published GTA and Ontario sources overlap, checked November 2026. Not a quote.
Rebates, permits & rules
- Gas work in Ontario must be done by a TSSA-certified gas technician. Ask for their certificate number.
- A replacement furnace usually needs a permit. Get in writing who pulls it.
- There's no Ontario rebate for a straight gas furnace swap. Heat pumps can qualify (see the heat pump guide).
- In Ontario, a company can't sign you up for a furnace, air conditioner or water heater (buy, rent or lease) at your door unless you contacted them first. If someone shows up uninvited, you don't have to let them in.
- Signed the contract at your home? Ontario gives you 10 days to cancel most contracts signed there, for any reason.
What a complete quote includes
If any of these aren't on your quote, ask. Missing doesn't mean it's wrong, but it should be in writing.
- Brand, model and efficiency (AFUE)
- BTU size, and how they worked it out (a load calculation, not just matching the old unit)
- Permit, and who pulls it
- Removal and disposal of the old furnace
- Venting and flue work
- Gas line connection and condensate drain
- Thermostat
- Parts warranty and labour warranty, in years
- Manufacturer registration (some warranties shrink if it isn't registered)
- Start-up and carbon monoxide safety test
- A rental or financing contract tucked into a 'replacement' quote
- Pressure to sign today to keep the price
- No model number, just 'high-efficiency furnace'
- Large deposit before the equipment is ordered
- Most furnaces last about 15–20 years. Past that, a big repair is often money into an old unit.
- A cracked heat exchanger is a safety issue. Get a second opinion, then replace.
- If a repair is under about a third of the replacement price and the furnace is under 12 years old, repair is usually the better call.
- Replacing your AC in the next few years too? Pricing both together, or a heat pump, can be cheaper overall.
5 questions to ask before you sign
- Did you do a heat-loss calculation to size this furnace?
- Who pulls the permit, and is it in the price?
- What's the labour warranty, and who honours it if your company closes?
- Is this a purchase, or a rental or financing agreement?
- Will you register the manufacturer warranty for me?
Paste your quote into ChatGPT, Claude or Gemini with this prompt:
I'm a homeowner in [city], Ontario. Here is my furnace quote: [paste]. List what it includes and leaves out (permit, old unit removal, venting, thermostat, warranties), flag anything vague, and give me 5 questions to ask before I sign. Don't guess a fair price.
Or skip the copy-paste: our free Quote Checker already knows what a furnace quote should include, and compares the price with real GTA ranges.
Common questions
How much does a new furnace cost in Toronto?
Most gas furnace replacements in the GTA land around $4,000–$7,000 before HST. High-efficiency models and complicated venting can push it to $9,000.
Is there a rebate for a new gas furnace in Ontario?
Not for a straight gas furnace swap in 2026. Heat pumps can qualify through Home Renovation Savings, which is scheduled to end November 30, 2026.
Should I rent or buy a furnace?
Buying usually costs less over the life of the furnace. Rental contracts can run 10–15 years with buyout fees. Read the contract's total cost and buyout terms before you sign.