Do I need a permit to replace a furnace in Mississauga?

Yes. A mechanical permit from the City of Mississauga Building Division is required for any furnace replacement. The permit triggers an inspection to confirm the installation meets the Ontario Building Code. A reputable contractor will pull this permit on your behalf before starting work.

How long does a furnace replacement take?

Most straightforward natural gas furnace replacements in a typical Mississauga home take four to eight hours in a single day. If new venting, ductwork modifications, or electrical upgrades are needed, the project may extend to a second day.

What AFUE rating should I choose for a Mississauga home?

For Mississauga's climate, a 96% AFUE or higher condensing furnace is generally recommended. The higher upfront cost is partially offset by lower monthly gas bills and potential rebates. An 80% unit may make sense if budget is the primary constraint and the home is older with existing single-pipe venting that would be costly to replace.

Is HST charged on furnace replacement in Ontario?

Yes. Ontario's 13% HST applies to both equipment and labour on residential furnace replacements. Always confirm whether a contractor's quote is before or after HST so you can compare prices accurately.

How do I verify an HVAC contractor is licensed in Ontario?

Ask the contractor for their TSSA gas technician licence number, which you can cross-reference on the TSSA website. Also request a current WSIB clearance certificate and ask whether the technician is registered with the Ontario College of Trades (OCOT) as a refrigeration and air conditioning systems mechanic.

Furnace Replacement Cost Mississauga (2026): What Homeowners Should Expect

A failing furnace in a Mississauga winter is not a problem you can put off. Whether your unit is short-cycling, blowing cold air, or simply past its 15–20 year service life, replacement is often the smarter long-term investment over repeated repairs. But what does a new furnace actually cost in Mississauga in 2026? This guide covers realistic price ranges, the factors that move the number up or down, permit requirements under Ontario law, and what to confirm before you hire an HVAC contractor.

Typical Furnace Replacement Cost in Mississauga (2026)

For most Mississauga homes, a complete furnace replacement — including the unit, labour, basic venting, and disposal of the old equipment — falls in the following ranges:

Standard efficiency (80% AFUE) natural gas furnace: $3,500 – $5,000 installed
Mid-efficiency (96% AFUE) natural gas furnace: $4,500 – $6,500 installed
High-efficiency (97–98.5% AFUE) natural gas furnace: $5,500 – $7,500 installed
Propane or oil-fired furnace replacement: $5,000 – $8,500 installed

All prices above should be read as before HST. Ontario's Harmonized Sales Tax of 13% applies to both equipment and labour on residential HVAC work, so factor that into your final budget. A mid-range natural gas replacement quoted at $5,500 will come to approximately $6,215 after tax.

What Affects the Price of a New Furnace in Mississauga

1. Efficiency Rating (AFUE)

Annual Fuel Utilization Efficiency (AFUE) measures how much of the fuel burned is converted to heat. Higher-efficiency units cost more upfront but lower monthly gas bills. In Mississauga's climate, many homeowners find that a 96% AFUE unit hits the right balance of upfront cost and long-term savings. Natural Resources Canada's current rebate programs may also offset the cost of a high-efficiency upgrade — ask your contractor about current eligibility.

2. Furnace Size and Home Square Footage

A furnace is sized in BTUs per hour. An undersized unit will run constantly and still fail to heat the home properly; an oversized unit will short-cycle and wear out sooner. A qualified HVAC technician will perform a Manual J load calculation to determine the correct size for your home. Larger homes in Mississauga's newer subdivisions in areas like Churchill Meadows or Lisgar may require higher-capacity units, which carry a higher price.

3. Venting and Ductwork Changes

High-efficiency furnaces require PVC flue venting rather than the traditional metal flue used by 80% units. If your home currently has an older standard-efficiency furnace, switching to a 96%+ model means new venting must be run, often through a wall or rim joist. This work can add $300 – $800 to the project cost. Existing ductwork that is undersized, leaky, or damaged will also add to the total.

4. Gas Line and Electrical Upgrades

Modern furnaces often require a dedicated 120V electrical circuit. If your panel lacks capacity, an electrical upgrade may be needed — work that must be done by a licensed electrician and inspected under the Ontario Electrical Safety Authority (ESA). Gas line modifications must be performed by a licensed gas technician registered with the Technical Standards and Safety Authority (TSSA). These add-ons are separate line items and can range from $200 to over $1,000 depending on complexity.

5. Removal and Disposal

Most reputable Mississauga HVAC contractors include old equipment removal in their quote, but confirm this in writing. Disposal of older units, particularly those containing certain refrigerants or asbestos-wrapped ductwork in very old homes, may be itemized separately.

6. Seasonality and Scheduling

Emergency or same-day replacements during peak winter months will typically cost more than a planned replacement booked in spring or early autumn. If your furnace is aging but still running, scheduling a replacement in the off-season can save money and give you more time to compare quotes.

Permit Requirements in Mississauga

A furnace replacement in Mississauga requires a mechanical permit from the City of Mississauga Building Division. Your contractor should pull this permit before work begins — it is not optional, and skipping it can create serious problems when you sell the home or make an insurance claim. Under Ontario's Technical Standards and Safety Act, all gas appliance work must be performed by a TSSA-licensed contractor. The permit triggers an inspection that confirms the installation meets the Ontario Building Code and manufacturer specifications. Always ask your contractor to provide proof that the permit has been applied for and that a final inspection has been completed.

What to Confirm Before You Hire an HVAC Contractor in Mississauga

TSSA licence: Verify the contractor or technician holds a valid gas technician (G1 or G2) licence issued by the TSSA.
WSIB coverage: Request a WSIB clearance certificate. This protects you from liability if a worker is injured on your property.
OCOT registration: In Ontario, HVAC/R mechanics are regulated trades under the Ontario College of Trades (OCOT). Ask whether the technician is a registered journeyperson.
Written, itemized quote: The quote should list equipment model and AFUE rating, labour, venting, permit fees, HST, and disposal separately.
Manufacturer warranty and labour warranty: Most major furnace brands offer 10-year parts warranties on heat exchangers. Confirm what labour warranty the installer provides — one to two years is standard.
Rebate assistance: Ask whether the contractor can assist with any available Canada Greener Homes or utility rebate applications for qualifying high-efficiency equipment.

Getting the Most from Your Investment

A new high-efficiency furnace installed by a licensed Mississauga HVAC contractor is one of the most impactful upgrades you can make to a GTA home. Pair the replacement with a smart thermostat, a fresh air exchanger assessment, and an annual maintenance plan to maximize both comfort and equipment lifespan. On VerifiedPros, every HVAC contractor is verified against TSSA, ESA, OCOT, and WSIB records before they can accept work — so you can request quotes knowing the professionals you hear from meet Ontario's licensing standards.