How Much Does a Furnace or Air Conditioner Cost in Ottawa? Five Price Lists, Two Regulators and a Rebate That Closed

Three published Ottawa price lists put a furnace replacement somewhere between $3,000 and $8,000 installed: Gas Man Ottawa publishes $3,500 to $5,000 for a standard 95% AFUE gas furnace and $5,500 to $7,500 or more for a modulating one, Colair publishes $3,000 to $7,000 including installation, and the contractor directory OttawaContractors.ca publishes $3,500 to $8,000 with the average homeowner at $4,500 to $6,000. Two of those three are Ottawa contractors; the third is a directory, like this one. Repairs are where the sources fall apart. AirZone HVAC Services, the one company here that posts an actual rate card, puts Ottawa furnace repair at $150 to $900, while the national platform HomeStars puts Ottawa HVAC repair at $500 to $5,000 with an average of $2,750, an average roughly three times AirZone's ceiling. Central air conditioning is published by Dion Comfort at about $3,570 budget, $5,600 average and up to $9,200 premium.

Two things almost nothing else in this market will tell you. A single furnace-and-AC changeout is legally two jobs under two different regulators, and the credential for one is not the credential for the other. And the rebate several Ottawa pages still promise for a new furnace is gone: the federal grant is closed, and the live Ontario programme has no furnace line item at all.

Furnace replacement: three Ottawa price lists side by side

All three columns are published figures from named companies, read 2026-08-12: Gas Man Ottawa, Colair Duct Cleaning and OttawaContractors.ca. Gas Man and Colair are Ottawa contractors quoting their own work. OttawaContractors.ca is a contractor directory, so its column is a published summary rather than an installer's own price, and it supplies the $8,000 top of the headline range. All three are published claims, not ours, not a market average, and not proof that anyone paid these amounts. Where they agree you have a band worth trusting. Where they diverge you have a question to ask.

Read the high-efficiency row twice. OttawaContractors.ca puts a 95 to 98% AFUE gas furnace at $3,500 to $6,500 and Gas Man Ottawa puts the same efficiency band at $5,000 to $7,500. The floors are $1,500 apart for what is described as the same equipment. The ductwork row is worse in proportion: $300 to $2,000 against $1,000 to $3,000. Neither is wrong, and averaging them would destroy the only useful signal in the table, which is that ductwork is the line item most likely to move your quote and the one you should get specified before you sign anything.

The add-ons that turn a $4,000 quote into a $6,000 invoice

Gas Man Ottawa publishes these separately from the furnace itself, with the condition that triggers each one. This is the part of a quote worth reading line by line, because every item here is a legitimate charge that a cheaper quote may simply have left out.

• Ductwork modification or sealing, $300 to $2,000. Triggered by old ducts with leaks, or ducts the wrong size for the new furnace.
• Venting conversion from chimney to sidewall, $200 to $500. Triggered by switching from mid-efficiency to high-efficiency.
• Gas line upgrade or extension, $200 to $600. Older gas piping incompatible with the new unit.
• Electrical work or panel upgrade, $150 to $400. A new variable-speed blower needing a dedicated circuit.
• Condensate drain installation, $100 to $300. High-efficiency furnaces produce condensation and it has to go somewhere.
• Smart thermostat installation, $150 to $400.
• Old furnace disposal, $0 to $200.Gas Man's own note is the useful part: most contractors include this, so confirm before signing.

Repairs and call-outs: the widest disagreement on this page

Three sources, three pricing models, and they do not reconcile. All read 2026-08-12: AirZone HVAC Services, WeatherFix and HomeStars.

HomeStars is a national platform rather than an Ottawa contractor, and it is the outlier in this set by a wide margin. Its averagerepair of $2,750 sits roughly three times above AirZone's ceiling of $900. Both numbers are published. Both are attributed. They cannot both describe the same job, and a homeowner budgeting from one is having a completely different conversation from a homeowner budgeting from the other. AirZone is the only source here that publishes what it actually charges by the hour, which is worth something on its own.

The call-out fee is the same problem in miniature. "Starting at $149 per hour plus HST" and "$99 to $150 per visit" sound like the same number and are not remotely the same deal. One is a rate that keeps running and has tax added on top; the other is a fixed fee to get someone through the door. Ask which model you are being quoted, ask whether the fee is credited against the repair if you go ahead, and ask what the after-hours rate is before you need it.

Air conditioning, heat pumps and the systems that cost more than the furnace

Cooling and heat pump figures published by Dion Comfort and by HomeStars, both read 2026-08-12. Dion Comfort is an Ottawa company; HomeStars is a national platform, and its heat pump upper bound of $50,000 is far outside every Ottawa contractor figure in this guide, so it is named rather than blended in.

One job, two regulators, and neither licence is the one people ask for

Licensing does get mentioned in this market, but only half of it. OttawaContractors.ca tells readers that a gas furnace installation needs a G2 licence and to verify it on the TSSA site, and Gas Man Ottawa describes its own technicians as TSSA-licensed. Both are talking about gas. Neither of them, and none of the other pages read for this guide on 2026-08-12, mentions that the cooling side is a separate compulsory trade under a separate regulator. Replacing a furnace and an air conditioner together is legally two pieces of work governed by two regimes. "Licensed HVAC technician" as an advertising phrase distinguishes neither of them.

The cooling side is a compulsory trade. Under O. Reg. 876/21, made under the Building Opportunities in the Skilled Trades Act, 2021, both "Refrigeration and air conditioning systems mechanic" and "Residential air conditioning systems mechanic" are classified as compulsory trades. Ontario has only 23 compulsory trades in total and air conditioning takes two of the slots, alongside Plumber, Electrician, Sheet metal worker, Steamfitter and Hairstylist. Both trades also appear on the list requiring a certifying examination. Compulsory means the individual doing the work needs a certificate of qualification, not simply experience. Read from the regulation on 2026-08-12.

The gas side is a different regulator entirely. Gas work falls under O. Reg. 212/01, made under the Technical Standards and Safety Act, 2000, and administered by TSSA rather than by Skilled Trades Ontario. Section 6 (1) is unambiguous: no person shall install, alter, purge, activate, repair, service or remove any appliance, equipment or other thing employed in the handling or use of gas unless that person holds a certificate for the purpose. Section 5 adds that nobody may handle gas without a licence. TSSA issues those certificates as G.1, G.2 and G.3 gas technician grades.

Two exemptions in that same section are worth knowing, because they are exactly the situations a homeowner meets. Duct cleaning is exempt, provided it is the only activity undertaken and the person does not interfere with the appliance (s. 6 (2)). And someone without the certificate may do the work in the presence of a certificate holder (s. 6 (3)), which is what makes an apprentice on site entirely legitimate. An uncertified person working alone on your furnace is not.

The company is regulated separately from the person. Section 21 (1) states that no person shall act as a contractor unless registered for the purpose. So a firm can employ a properly certified gas technician and still not be a registered contractor, or be registered on the gas side while the person who handles your refrigerant holds no certificate of qualification. It is genuinely possible to be legitimate on one side and not the other, which is why one question is not enough.

The check you can do from your driveway, before anyone comes inside

This costs nothing and takes about four seconds. Section 21 (7) of O. Reg. 212/01 requires that a registered contractor display the evidence of registration in a conspicuous place at its business premises, and that all field vehicles other than delivery trucks, whether leased or owned, be clearly marked with the contractor's name and registration number.

The truck in your driveway is the compliance check. A registration number on the door is what the regulation requires to be there. An unmarked van is not proof of anything on its own, but it is a reasonable thing to ask about before someone opens a gas line in your basement, and the number gives you something you can put on the invoice and check later.

One more provision worth carrying. Where a notice has been affixed to an appliance or work, commonly a red tag, no person may remove it unless they hold a certificate for that purpose, and on removing it they must endorse their certificate number, name and address on the notice. If a technician red tags your furnace, the tag is not a piece of paper anyone is free to take off.

The rebate almost every Ottawa page still promises is gone

This is the most consequential budgeting fact here, and it corrects the search results rather than adding to them. The Canada Greener Homes Grant is closed. Natural Resources Canada states it plainly: "Status: This program is closed", with December 1, 2025 recorded as the deadline for Ontario applicants to complete their post-retrofit EnerGuide evaluation, and Enbridge Gas having closed intake to the Home Efficiency Rebate Plus programme on February 5, 2024. Read 2026-08-12. Pages that rank for these queries were still citing that grant as available on the same date.

The programme that does exist is pointed at heat pumps, not furnaces. The Home Renovation Savings Program, run by Enbridge Gas and Save on Energy with the Government of Ontario, publishes heat pumps up to $12,000, solar panels and battery storage up to $10,000, attic insulation at $1,000 or $1,250, smart thermostats at $75 or $100 and appliances up to $200, none of which need a home energy assessment. With an assessment it adds insulation up to $7,700, windows and doors at $100 per rough opening, heat pump water heaters at $500 and air sealing up to $250. There is no gas furnace line item anywhere on that page.

And the Enbridge furnace rebate that two Ottawa pages advertise cannot be resolved. Gas Man Ottawa publishes up to $250 for furnaces with ECM blower motors plus $75 for a smart thermostat. OttawaContractors.ca publishes up to $1,000 for high-efficiency gas furnaces. That is a fourfold contradiction between two live pages, and neither the Home Renovation Savings site nor Enbridge's own Home Efficiency Rebate Plus page carried a furnace rebate when both were read on 2026-08-12. This guide is not going to pick a side. Ask the contractor to show you the programme page for any rebate they quote into your budget, and treat the money as absent until you have seen it.

What the City of Ottawa will actually finance

The Better Homes Ottawa Loan Program offers low-interest 20-year loans of up to $125,000, or 10 per cent of the home's current value assessment, whichever is less. The minimum is $10,000, dropping to $5,000 for a second application. The rate is published as 4.33% fixed over the 20-year term with a 4% administrative charge, and repayment runs through the property tax bill, with the option to pay the balance off in one lump sum at any point without penalty. Read 2026-08-12.

Its incentives are electrification incentives: $700 per ton for central cold climate air source heat pumps or cold climate mini split and multi split systems, $1,000 per ton for a ground source heat pump, and $5 per metre of vertical well depth or horizontal loop. There is also a $600 reduction on an approved loan after completing the programme, available only to applicants not receiving a $600 assessment rebate from the Home Renovation Savings Program, which is a stacking rule worth knowing before you apply to both.

And the programme answers the furnace question directly. Asked whether it funds natural gas upgrades, its own page replies that it does not fund natural gas-powered upgrades, such as furnaces or water heaters, as it supports the transition to electrification. So both the provincial programme and the municipal loan point the same way. If you are replacing a gas furnace with a gas furnace, budget it at full price. The subsidy in Ottawa is for switching to a heat pump, or it is a loan.

Two published rules for repair or replace, and they disagree on the same furnace

Both of these circulate as received wisdom in this market, and putting them next to each other is more useful than repeating either one.

• Gas Man Ottawa's 50% Rule: if the repair costs 50 per cent or more of a new furnace, replace it.
• WeatherFix's $5,000 Rule: multiply the age of the equipment by the estimated repair cost, and if the total exceeds $5,000, seriously consider replacing.

Run a 12-year-old furnace needing a $600 repair through both. WeatherFix gives 12 times $600, which is $7,200, comfortably over the threshold, so: replace. Gas Man's rule asks whether $600 is at least half the price of a new furnace, and against its own published $3,500 floor it is nowhere close, so: repair. Two published rules, one furnace, opposite answers.

Neither is a formula so much as a way of asking the real question, which is how many more winters this unit has in it. The rules are worth knowing mostly so you recognise which one a salesperson is quoting at you, and can ask what happens if you apply the other. Gas Man's own efficiency arithmetic points the same way: it publishes annual operating costs of about $1,200 to $1,400 for a 95% AFUE furnace against $1,050 to $1,200 for a 98%+ model, notes the annual difference is only $50 to $100 in a typical Ottawa home, and states that 98% models cost $1,000 to $2,000 more upfront, making the payback period 15 to 30 years. A company arguing against its own most expensive product is worth reading twice.

Book it in late summer, not in a January emergency

Gas Man Ottawa publishes the number that makes this argument on its own: late summer and early fall are the best times to replace a furnace in Ottawa, and emergency winter replacements can cost 15 to 25 per cent more because of urgency. The same page puts a standard swap at four to eight hours, finished in a single day, extending to two days when ductwork or venting has to change.

The service call moves in the same direction and steeper. WeatherFix publishes an after-hours or emergency visit at $250 to $400 or more just to have someone attend, and states that the base diagnostic fee can double or even triple outside normal business hours. AirZone's posted after-hours and emergency rate is $225 per hour plus HST against $149 in regular hours, higher again on statutory holidays. These are two different premiums, one on the replacement and one on the visit, and a January failure can attract both at once. On a $5,000 replacement a 15 to 25 per cent urgency premium is $750 to $1,250, which is a real number for choosing a Tuesday in September.

What to ask before you sign

Generic advice is not worth much here. These questions come straight out of what is above, and each one has a right answer you can check.

• "What is your TSSA contractor registration number, and is it on the truck?" Registration is required under s. 21 (1), and s. 21 (7) requires the name and number to be marked on field vehicles. Put the number on the invoice.
• "Who is holding the gas certificate on my job, and what grade is it?" G.1, G.2 or G.3. If an apprentice is doing the work, the certificate holder has to be present, which is the exemption in s. 6 (3).
• "Who is doing the refrigerant work, and do they hold a certificate of qualification?" This is the compulsory trade side, and it is a different person and a different regulator from the gas side.
• "Is your call-out fee per hour or per visit, is HST included, and is it credited against the repair?" The published models run from $99 flat to $149 per hour plus HST. You cannot compare two quotes until you know which is which.
• "What ductwork, venting, gas line and electrical work is in this quote, and what is excluded?" These are the line items that separate a $300 add-on from a $3,000 one, and the most common reason a cheap quote grows.
• "Show me the programme page for any rebate in this quote." The federal grant is closed and the provincial programme has no furnace line item. A rebate you cannot see published is a rebate you should not budget.
• "Is disposal of the old unit included?" Gas Man puts it at $0 to $200 and says most contractors include it. It is a small number and a fast way to see how a quote is written.
• "What is the after-hours rate?" Ask in September, when you are not paying it.

Where to shortlist Ottawa HVAC companies

The furnace, AC and heating directory on Ottawa Service Directory lists Ottawa companies with their Google rating and the review count behind it. Claimed listings are labeled and may appear first; how other listings are chosen is on the methodology page. Shortlist two or three, ask for the TSSA registration number and the certificate grades, get the ductwork and venting specified in writing, and do it before the first cold night.