Replacing a furnace is one of the bigger home investments an Ottawa homeowner makes — and with our long, cold winters, it's not something you want to get wrong. This 2026 guide breaks down what a new furnace actually costs in Ottawa, what drives the price up or down, when replacement beats repair, and how rebates and financing can lower your out-of-pocket cost.
Average Furnace Replacement Cost in Ottawa (2026)
For most Ottawa homes, a professionally installed furnace costs between $3,500 and $7,500. Where you land depends mostly on the size and efficiency of the unit and the complexity of the install:
- Mid-range high-efficiency gas furnace (single-stage, ~95% AFUE): roughly $4,000–$5,500 installed.
- Two-stage or modulating high-efficiency furnace: roughly $5,500–$7,500 installed, with quieter operation and better comfort.
- Premium modulating furnace for a large home, or an install needing ductwork or venting changes: $8,000 and up.
These prices include the equipment, professional installation, removal of your old furnace, and basic permits. They do not include major ductwork redesigns, a new chimney liner, or fuel conversions, which are quoted separately. For a related comparison, see our guide on heat pump installation costs in Ottawa.
What Affects Your Final Furnace Price?
Several factors move the number up or down:
- Furnace size (BTU output): a larger home needs more heating capacity, which costs more. Correct sizing matters — an oversized furnace short-cycles and wears out faster.
- Efficiency (AFUE rating): a 96–98% AFUE furnace costs more upfront than an 80% model but wastes far less fuel over its life.
- Single-stage vs. two-stage vs. modulating: more advanced staging improves comfort and quietness at a higher price.
- Installation complexity: new venting, gas-line adjustments, a chimney liner, or converting from oil all add labour and materials.
- Brand and warranty: premium brands and extended warranties carry higher prices but often better long-term reliability.
Dtech installs and services furnaces from all major brands and provides an itemized, no-surprise quote so you can see exactly what you're paying for.
High-Efficiency vs. Mid-Efficiency: Which Is Worth It?
In Ottawa's climate, where the furnace runs hard for five to six months a year, efficiency pays off. An older 80% AFUE furnace sends roughly one of every five heating dollars up the chimney. A modern 96%+ furnace converts almost all of the fuel into heat for your home. Over a 15–20 year lifespan, the fuel savings from a high-efficiency unit can offset a meaningful share of the higher purchase price — while also delivering more even, comfortable heat. For most homeowners replacing an aging furnace, high-efficiency is the sensible choice.
Repair or Replace? When a New Furnace Makes Sense
Not every furnace problem means replacement. A failed igniter or flame sensor is a straightforward, affordable furnace repair. But replacement usually makes more sense when:
- The furnace is more than 15 years old (most last 15–20 years).
- It needs a major, costly part such as a cracked heat exchanger.
- Your energy bills keep rising despite maintenance.
- It breaks down repeatedly or struggles to keep the home warm.
- You're already planning to add air conditioning — a good moment to consider a heat pump.
A helpful benchmark: if a repair costs more than about half the price of a new furnace and the unit is near the end of its life, replacement is usually the smarter investment.
The Heat Pump Alternative — and Bigger Rebates
Here's something many Ottawa homeowners don't realize when pricing a furnace: a heat pump can replace both your furnace and your air conditioner, and it qualifies for far more generous rebates than a standard furnace does. Through Ontario's Home Renovation Savings Program, a heat pump can earn up to $7,500, and oil-heated homes can add up to $15,000 federally. A dual-fuel system keeps a gas furnace as automatic backup while the heat pump handles most of the year efficiently. If you're already spending on new heating equipment, it's well worth comparing — read our 2026 Ottawa heat pump rebate guide or current rebate programs.
Financing Your New Furnace
A furnace replacement often comes at the worst possible time — when the old one quits mid-winter. Dtech offers flexible financing options that spread the cost over manageable monthly payments, so you can get your heat back on without draining your savings. We'll walk you through the options alongside your quote.
Signs You Need a New Furnace Soon
- The furnace is 15+ years old.
- Rising or uneven heating (some rooms never warm up).
- Frequent repairs or strange noises — banging, rattling, screeching.
- A yellow (rather than blue) burner flame, or a rising gas bill.
- The furnace runs constantly or short-cycles on and off.
If you notice several of these, it's worth getting a replacement quote before a mid-winter breakdown forces a rushed decision.
How to Get an Accurate Furnace Quote in Ottawa
Online estimates are useful for budgeting, but the only way to know your real price is an in-home assessment. A proper quote accounts for your home's size and layout, existing ductwork and venting, the efficiency level you want, and any code upgrades. Dtech provides free, no-obligation, written quotes across Ottawa — including Kanata, Barrhaven, Nepean and Orléans — and we're BBB A+ accredited with a 4.9-star rating across 125 reviews. Request your free furnace quote today.
Frequently Asked Questions
How much does a new furnace cost in Ottawa in 2026?
A professionally installed furnace in Ottawa typically ranges from about $3,500 to $7,500. Mid-range high-efficiency gas furnaces for an average home usually land around $4,500 to $6,000 installed, while larger homes, premium modulating models, or installs that require ductwork or venting changes can reach $8,000 or more. Dtech provides a firm, itemized quote after assessing your home.
Is it worth repairing an old furnace or replacing it?
As a rule of thumb, if your furnace is over 15 years old, needs a major repair such as a heat exchanger, or your heating bills keep climbing, replacement is usually the better value. A repair that costs more than about half the price of a new unit on an aging furnace rarely makes financial sense. Dtech gives you an honest repair-versus-replace recommendation.
How much can I save with a high-efficiency furnace?
Upgrading from an old mid-efficiency furnace (around 80% AFUE) to a modern high-efficiency model (95–98% AFUE) means far less fuel is wasted, which can noticeably lower your winter gas bills. The exact savings depend on your home and usage, but many Ottawa homeowners recover a meaningful portion of the cost over the furnace's life through lower energy use.
Are there rebates for a new furnace in Ottawa?
Rebates for standard gas furnaces are limited in 2026, but the big incentives apply to heat pumps: up to $7,500 through Ontario's Home Renovation Savings Program, plus up to $15,000 federally for oil-to-heat-pump conversions. Many Ottawa homeowners replacing a furnace now consider a heat pump or dual-fuel system to capture those rebates. Dtech will compare both options for you.
How long does a furnace replacement take?
A straightforward furnace replacement is usually completed in a single day. Installs that involve ductwork modifications, a chimney liner, or a fuel conversion may take longer. Dtech confirms the exact timeline with your written quote and works to keep your home comfortable throughout.
