Furnace Replacement in Ontario: Costs, Options & Expert Installation

A furnace is the one appliance nobody thinks about until it stops working on a January night. If yours is getting old, needs frequent repairs, or your gas bills keep climbing, it may be time for a furnace replacement. Bridlewood Mechanical has replaced furnaces in homes and cottages across Gravenhurst, Bracebridge, and Muskoka since 1975. This page covers what a new furnace costs in Ontario, how to tell whether to repair or replace, and what a proper installation looks like.

Signs It's Time to Replace Your Furnace

Most gas furnaces last about 15 to 20 years. Age alone isn't the deciding factor, but combined with any of these signs, replacement usually makes more sense than another repair:

• Your furnace is 15+ years old and running on original parts
• Repairs are getting frequent, with more than one service call per heating season
• Heating bills are rising even though your usage hasn't changed
• Uneven heating: some rooms are always cold, others too warm
• A yellow or flickering burner flame instead of a steady blue one
• Soot, rust, or cracks around the furnace or heat exchanger
• Carbon monoxide alarms going off, or family members getting headaches when the heat is on
• Loud banging, rattling, or squealing from the unit or ductwork

A cracked heat exchanger is the most serious of these. It can let carbon monoxide into your home, and replacing the furnace is almost always safer and more economical than repairing it.

Should You Repair or Replace Your Furnace?

We'll always give you an honest recommendation. Here's the framework our technicians use:

A common rule of thumb: if a repair costs a large share of a new furnace and the unit is already past 15 years old, replacement is usually the better investment.

How Much Does Furnace Replacement Cost in Ontario?

The installed cost of a new furnace in Ontario varies with the equipment and your home. The main factors are:

1. Furnace efficiency. A high-efficiency furnace (95–98% AFUE) costs more upfront than a mid-efficiency unit but uses less natural gas or propane every year.
2. Size (BTU output). A properly sized furnace is based on your home's heat loss, not just its square footage.
3. Single-stage, two-stage, or modulating. Two-stage and modulating furnaces run longer at lower output for more even heat and quieter operation.
4. Venting and ductwork changes. Switching from a chimney-vented furnace to a high-efficiency model requires new PVC intake and exhaust venting and a condensate drain.
5. Fuel type. Natural gas, propane, or oil-to-gas and oil-to-heat-pump conversions all affect the scope of work.
6. Access. Crawlspaces, tight mechanical rooms, and cottage properties can add labour.

Rather than a generic number, we provide a free, written quote after assessing your home. You see the exact equipment, labour, and any venting or ductwork changes before you decide.

High-Efficiency Furnace Options

Almost every furnace we install today is a high-efficiency condensing model. These furnaces extract so much heat from combustion that the exhaust is cool enough to vent through plastic pipe. The result is lower fuel bills and a smaller carbon footprint. We install trusted brands including Rheem, Goodman, and Navien, and we'll explain the real-world difference between models rather than steering you to the most expensive one. Learn more on our High-Efficiency Gas Furnace Installation page.

Pairing a New Furnace with a Heat Pump

If you're replacing your furnace, it's the ideal time to consider a hybrid (dual-fuel) system. A cold-climate heat pump handles heating and cooling for most of the year, and the new furnace takes over on the coldest Muskoka nights. This setup often qualifies for provincial heat pump rebates and can significantly cut operating costs. See Heat Pump Installation and Heat Pump Financing & Rebates.

Our Furnace Replacement Process

1. In-home assessment. We inspect your current furnace, venting, ductwork, and gas line, and ask about comfort problems.
2. Heat loss calculation. We size the new furnace to your home, not a rule of thumb.
3. Written quote. Equipment options, efficiency ratings, and total installed price, with no surprises.
4. Safe removal. We disconnect and remove your old furnace and dispose of it responsibly.
5. Professional installation. New furnace, venting, condensate drain, gas connection, and thermostat, all to code.
6. Commissioning and safety checks. Gas pressure, combustion, temperature rise, and carbon monoxide testing.
7. Walkthrough. We show you how the system works, how to change the filter, and what maintenance it needs.

Most standard furnace replacements are completed in a single day.

Furnace Rebates in Ontario

Rebate programs change often. Stand-alone furnace rebates are limited, but incentives are generally available when a furnace upgrade is paired with a heat pump or other efficiency improvements, for example through Ontario's Home Renovation Savings program. Our team will tell you what's currently available and help with the paperwork. See Heat Pump Financing & Rebates.

Why Choose Bridlewood Mechanical for Furnace Replacement

• Family-owned and serving Muskoka since 1975, now in our third generation
• Certified gas technicians licensed for natural gas and propane
• Custom sheet metal and ductwork done in-house, so we can modify ducting properly instead of forcing a fit
• Honest, upfront pricing, with free replacement quotes

Furnace Replacement FAQs

What is the average cost to replace a furnace in Ontario? It depends on efficiency, size, venting, and access. The most accurate answer is a written quote based on your home. We provide them free, and we'll show you how different furnace options compare on upfront cost and yearly fuel savings.

Should a 25-year-old furnace be replaced? In almost every case, yes. A 25-year-old furnace is well past the typical 15–20 year lifespan, is likely 60–80% efficient, and carries a higher risk of heat exchanger failure. Replacing it improves safety, comfort, and fuel costs.

Is there a rebate for a new furnace in Ontario? Furnace-only rebates are limited, but combining a new furnace with a cold-climate heat pump often unlocks provincial incentives. We'll check what's available when we quote.

Are furnace prices going up in 2026? Equipment prices have risen steadily in recent years because of refrigerant changes, manufacturing costs, and efficiency regulations. If your furnace is near the end of its life, planning the replacement before it fails lets you choose equipment and timing instead of paying for an emergency.

What size furnace do I need for a 2,000 square foot home in Canada? It depends on insulation, windows, air sealing, and climate. A well-insulated 2,000 sq ft home may need far less capacity than an older, drafty one of the same size. We calculate your actual heat loss so you don't pay for an oversized furnace that short-cycles.

What is the best time of year to replace a furnace? Late spring through early fall. Scheduling is more flexible and you're not without heat. That said, we handle emergency replacements through the winter when a furnace fails.

Should I repair or replace my furnace? If it's under about 12 years old and the repair is modest, repair usually makes sense. If it's older, needs frequent repairs, or has a safety issue like a cracked heat exchanger, replace it.

Book Your Free Quote

Call (705) 706-7622 or request a free quote online. Our team will get back to you quickly to book a visit.