Furnace Installation in Ottawa
Furnace replacement with high-efficiency gas furnaces, sized to your home and installed by licensed gas technicians
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- TSSA & HRAI approved
- 24/7 emergency service
- Family-owned since 2014
Furnace replacement with high-efficiency gas furnaces, sized to your home and installed by licensed gas technicians
- Free quotes on any equipment purchase
- Financing from $49/month (OAC)
- All makes and models serviced
What furnace installation in Ottawa costs
Most Ottawa furnace replacements land between $4,500 and $8,500 installed. The spread comes from the furnace itself (single-stage, two-stage or modulating) and from what the house needs to accept it.
| Project | Typical installed range (CAD, before rebates) |
|---|---|
| High-efficiency gas furnace, 96–98% AFUE | $4,500 – $8,500 |
| Variable-speed / modulating furnace | Up to ~$10,500 |
| Furnace + central air conditioner together | $8,000 – $15,000 |
| Add a furnace humidifier (bypass / fan-powered) | $500 – $1,000 |
| Add a smart thermostat | $250 – $600 |
The final price depends on your home, the equipment you choose and the venting and ductwork it needs. Oria gives free quotes on any equipment purchase.
What moves the price up or down
- Venting. Condensing furnaces vent through PVC pipe out a side wall. Long runs, tight clearances to windows, doors and the gas meter, or a basement with no easy exterior wall add labour.
- An orphaned water heater. If your old furnace shared a chimney with a gas water heater, the water heater may need a chimney liner or its own venting once the furnace leaves the chimney.
- Ductwork and the AC coil. A new furnace rarely matches the old cabinet size, so plenum transitions are rebuilt. Undersized return air ducts sometimes need to be enlarged.
- Condensate drainage. No floor drain nearby means adding a condensate pump.
See our full breakdown in furnace replacement cost in Ottawa.
Sizing: why we calculate heat loss instead of copying the old furnace
The size on your old furnace’s label is not a good guide. Many Ottawa homes have had windows, insulation and air sealing upgraded since the original furnace went in, and a lot of furnaces were oversized from day one.
We calculate how much heat your house actually loses at Ottawa’s design temperature of about −25 °C. That accounts for square footage, insulation levels, window area and type, air leakage, ceiling height and how much of the basement is below grade.
Remember that the label shows input. A 95% AFUE furnace rated at 80,000 BTU/h input delivers about 76,000 BTU/h of heat. It is common to find a 100,000 BTU/h furnace in a house that needs closer to half that.
An oversized furnace short-cycles: it blasts heat, shuts off, and repeats. That wears the ignitor and heat exchanger faster, leaves rooms uneven and makes more noise. Our furnace sizing guide explains the factors in more detail.
Single-stage, two-stage or modulating: which furnace fits?
Every new gas furnace sold in Canada must be at least 95% AFUE, so efficiency differences between models are now small. The bigger difference is how the burner and blower run.
| Single-stage | Two-stage | Modulating (variable-capacity) | |
|---|---|---|---|
| How it runs | Full fire or off | Low fire (about 60–70%) most of the time, high fire on cold days | Adjusts in small steps to match the heat the house is losing |
| Typical AFUE | 95–96% | 96–97% | 97–98% and up |
| Comfort | Noticeable temperature swings | Even, quieter | Most even; long, quiet cycles |
| Best for | Tight budgets, smaller homes, rentals | Most Ottawa family homes | Larger homes, open layouts, people sensitive to drafts or noise |
Pair a two-stage or modulating furnace with a variable-speed blower and a compatible thermostat, or you lose much of the benefit.
If you are replacing an older furnace, the fuel savings can be large. Moving from a 60% AFUE furnace to a 96% model uses roughly 35% less gas for the same heat; from an 80% mid-efficiency furnace, roughly 17% less. Our AFUE, SEER2 and HSPF2 explainer covers the ratings.
Lennox, Goodman and the other brands we install
Oria is a Lennox authorized dealer. We also install Goodman and all other major brands, so we can match the equipment to your budget instead of pushing one product line.
Lennox and Goodman both build furnaces in the 96–98%+ AFUE range with two-stage and modulating options. The practical differences are in features, parts availability and price; our Goodman vs Lennox comparison and our list of high-efficiency furnaces for Ottawa homes walk through them.
Whatever brand you choose, we register the warranty with the manufacturer and show you how to run the new equipment. One Ottawa customer, J. Lyons, had a new furnace, thermostat and humidifier installed in a few hours by Mansoor’s team and noted that our price came in below the other quotes they had received.
Signs it is time to replace your furnace
One of these on its own may only mean a repair. Two or three together on a furnace over 15 years old usually means replacement is the better spend.
It is 15 to 20 years old
That is the normal lifespan of a gas furnace in Ottawa's long heating season. Parts get harder to find after that.
Repairs keep coming
A second major repair in two winters, such as an inducer motor after a control board, is a strong signal.
Gas bills creep up
Rising Enbridge bills with no change in thermostat habits point to a furnace losing efficiency.
Uneven rooms and short cycles
Cold bedrooms, a furnace that starts and stops every few minutes, or one that runs constantly on cold nights.
A cracked heat exchanger
Cracks can let combustion gases, including carbon monoxide, mix with house air. On an older furnace this is almost always a replacement.
Mid-efficiency or older equipment
An 80% furnace venting into a chimney, or anything with a standing pilot, wastes fuel that a 96% model would save.
What happens on installation day
- 1
Arrival and protection
We lay floor protection from the door to the mechanical room and confirm the plan with you before shutting anything off.
- 2
Remove the old furnace
Gas and power are shut off, the old unit is disconnected and taken away. We dispose of it for you.
- 3
Set and connect the new furnace
The furnace is levelled, and new supply and return transitions are built to fit the existing ductwork and AC coil.
- 4
Venting and condensate
PVC intake and exhaust pipes are run to code clearances, and the condensate drain or pump is installed and protected from freezing.
- 5
Gas, electrical and thermostat
Our licensed gas technician connects and leak-tests the gas line, wires the furnace and connects the thermostat.
- 6
Start-up and commissioning
We check gas pressure, temperature rise, combustion and airflow so the furnace runs the way the manufacturer specifies.
- 7
Walk-through
You get a clean space, a fresh filter, an explanation of the controls and filter schedule, and warranty registration.
Financing, rebates and replacing your AC at the same time
A new furnace is a large expense that often arrives unplanned. Financing is available from $49/month on approved credit, so a failing furnace does not have to be patched through another winter.
Rebates may be available. Oria will check current programs for your home; see our heating and cooling rebates page for what to expect. Heat pump options are frequently where the larger incentives sit, so we will tell you if adding a cold-climate heat pump changes the numbers.
Should the air conditioner be replaced too?
The AC’s indoor coil sits on top of the furnace, so the two are connected. Replacing both together ($8,000 – $15,000) makes sense when:
- Both systems are over 15 years old.
- The AC still runs on R-22 refrigerant, which has been phased out and is costly to recharge.
- You want a matched system so the furnace blower and AC coil are rated to work together.
If your AC is newer, we reuse it and rebuild the connection to the new furnace. Homeowners tell us how this goes: Johnny G. wrote, “Got a new furnace installed in my home and had the best experience!” and Alex G. described the team as “Clean professional and reliable.”
Book your furnace replacement estimate
- Call (613) 866-1869 or email info@oriaheatingandcooling.com
- Lennox authorized dealer; Goodman and all major brands installed
- TSSA and HRAI approved, serving Ottawa since 2014
- 5.0-star Google rating from 578 reviews
Frequently Asked Questions
Straight answers from licensed Ottawa technicians. Still have a question? Call us any time.
How long does a furnace installation take?
Most straightforward furnace replacements in Ottawa are completed in one day. Jobs that need new venting routes, a chimney liner for the water heater, ductwork changes or a combined furnace and air conditioner replacement can take longer. We tell you the expected timeline when we give the estimate, so you can plan around it.
What size furnace do I need for my Ottawa home?
It depends on your home’s heat loss at about −25 °C, not just its square footage. Insulation, windows, air leakage and basement depth all change the answer. Many Ottawa homes need much less than the furnace they have, which is why Oria calculates heat loss before recommending a size rather than copying the old label.
Is a modulating furnace worth it in Ottawa?
A modulating furnace costs more, up to about $10,500 installed versus $4,500 to $8,500 for most high-efficiency furnaces. It pays back mainly in comfort: steadier temperatures, quieter operation and fewer cold spots in larger or open-plan homes. For many average-size homes, a two-stage furnace with a variable-speed blower gets most of that benefit for less.
Who is allowed to install a gas furnace in Ontario?
In Ontario, gas furnace installation is regulated by the TSSA and must be done by a registered contractor using licensed gas technicians. Oria is TSSA and HRAI approved, and our technicians hold gas licences. A proper installation includes a gas leak test, combustion check and code-compliant venting, and a carbon monoxide alarm near sleeping areas.
Can a new high-efficiency furnace use my existing chimney?
No. High-efficiency condensing furnaces produce cool, wet exhaust and vent through PVC pipe out a side wall or the roof. If a gas water heater shared the chimney with your old furnace, it may need a chimney liner or new venting once the furnace is removed. We check this during the estimate so it is in the price.
Are there rebates for a new furnace in Ottawa?
Rebates may be available, depending on the equipment and the programs running when you install. The Ontario Home Renovation Savings Program is the main program to check, and larger incentives often apply to heat pumps. Oria will check current programs for your home and explain what you may qualify for before you commit.
Do you offer financing on furnace installation?
Yes. Oria offers financing on new furnaces from $49 per month on approved credit. It is often used when a furnace fails mid-winter and replacement cannot wait. Ask for financing options when you book your free quote, and we will include the monthly payment alongside the installed price.
Book Service or Get a Free Quote
Tell us what is going on and we will call you back with honest advice and a written estimate. Financing from $49/month on approved credit.
- Licensed gas & refrigeration technicians
- 5.0 stars from 578 Google reviews
- 24/7 emergency service
5.0 Stars from Ottawa Homeowners
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Serving Ottawa, Gatineau and the Surrounding Area
Based at 925 Longfields Dr in Nepean, our technicians cover the whole capital region.