Key takeaways
Central AC replacement
$4,000 – $8,000 installed in most Ottawa homes with existing ductwork.
Furnace + AC together
$8,000 – $15,000, and often cheaper than doing them two years apart.
Ducted cold-climate heat pump
$9,000 – $18,000. It cools like an AC and also heats the house for most of the winter.
No ducts?
A single-zone ductless mini-split is $3,500 – $6,500; multi-zone (2–4 heads) is $7,000 – $16,000.
New equipment is rated in SEER2
And uses newer refrigerants (R-454B or R-32). Old R-22 systems cannot be recharged economically.
Bigger is not better.
A properly sized 2–3 ton unit beats an oversized one on comfort and humidity.
These are typical Ottawa installed ranges in Canadian dollars, before rebates. They are not quotes. Your final price depends on the home, the equipment and the venting, electrical and ductwork involved, and Oria gives free quotes on any equipment purchase.
AC installation cost in Ottawa: 2026 price table
The table below shows what Ottawa homeowners typically pay for each type of cooling system, fully installed. Use it to set a budget before you call for quotes.
| System | Typical installed range (CAD) | Best fit |
|---|---|---|
| Central air conditioner replacement | $4,000 – $8,000 | Homes with a furnace and ducts already in place |
| Furnace + AC combo replacement | $8,000 – $15,000 | Both units are 15+ years old, or the furnace blower is weak |
| Ducted cold-climate heat pump | $9,000 – $18,000 | Homeowners who want cooling plus efficient electric heating |
| Ductless mini-split, single zone | $3,500 – $6,500 | One hot room, an addition, a finished attic or a basement suite |
| Ductless mini-split, multi-zone (2–4 heads) | $7,000 – $16,000 | Older homes and homes on baseboard or hot-water heat with no ducts |
| Smart thermostat (add-on) | $250 – $600 | Better scheduling and humidity control with the new system |
| Annual AC tune-up (after install) | $120 – $200 | Keeping the warranty and efficiency on track |
For a typical Barrhaven, Kanata or Orléans detached home of 1,800–2,400 sq ft with a working furnace, a mid-efficiency 2.5–3 ton central AC usually falls in the middle of the $4,000 – $8,000 range. Townhouses with short line sets are often near the low end. Large homes, premium variable-speed units and difficult installs push toward the top.
What drives the cost of a new air conditioner
Two quotes for “a 3-ton AC” can be $3,000 apart. These are the real reasons why.
1. Size (tonnage) and a proper load calculation
Most Ottawa homes need 1.5 to 4 tons of cooling. Each step up in capacity adds to the equipment price. More importantly, an oversized unit short-cycles: it cools the air fast but shuts off before it removes humidity, which leaves the house cold and clammy on a 35 °C humidex day. A contractor should size the system from your home, not from the old unit’s label.
2. Efficiency (SEER2) and compressor type
Single-stage units are the most affordable. Two-stage and variable-speed (inverter) units cost more but run longer at low speed, which means quieter operation, better dehumidification and lower hydro bills. Expect variable-speed models near the top of the price range.
3. Your furnace and indoor coil
A central AC needs a matched indoor coil sitting on your furnace, and it relies on the furnace blower to move air. If your furnace is 15–20 years old or has an old PSC blower motor, pairing a new AC with it can limit performance. That is when replacing both together, at $8,000 – $15,000, starts to make sense.
4. Line set, pad and location
The copper refrigerant lines between the outdoor unit and the indoor coil are often reused if they are the right size and in good shape. New equipment with a different refrigerant may need a new line set or a careful flush. A longer run, a rooftop or side-yard location, or a new pad or wall bracket adds labour.
5. Electrical work
Most replacements reuse the existing 240 V circuit and add a new outdoor disconnect. A first-time AC install, or a panel that is already full, may need a new breaker, wiring or a panel upgrade, which can add several hundred dollars or more.
6. Ductwork
Ducts sized only for heat can be too small for cooling airflow. Undersized returns are common in older Ottawa bungalows and split-levels. Adding a return or fixing a restriction costs money up front but protects the compressor and your comfort.
7. Brand and warranty registration
Premium lines cost more than value lines from the same manufacturer. Whichever brand you choose, register the warranty within the manufacturer’s deadline, or coverage may drop to the base level.
SEER2 and the new refrigerants: what changed for 2026
Since 2023, North American air conditioners and heat pumps are rated in SEER2, EER2 and HSPF2. These use tougher test conditions than the old SEER ratings, so a 15.2 SEER2 unit is roughly comparable to an older 16 SEER label. Do not compare a SEER number on one quote to a SEER2 number on another.
Refrigerants have also changed. R-22 is phased out. R-410A is being replaced in new equipment by lower-impact refrigerants: current Lennox air conditioners use R-454B, and Goodman’s current lineup uses R-32. For you, that means:
- A new outdoor unit must be paired with a matching new indoor coil. Mixing an R-454B condenser with an old R-410A coil is not an option.
- If your existing system runs on R-22, repairs involving refrigerant are expensive and short-lived. Replacement is usually the better spend.
- Efficiency choices now run from about 13.4–15 SEER2 for entry models up to 22–26 SEER2 for top variable-capacity units.
For most Ottawa homes, a mid-range 15–18 SEER2 unit is the sweet spot. Our cooling season is short, so the very top tiers take a long time to pay back on hydro savings alone. They are worth it mainly for comfort, quiet and humidity control. Our SEER2, AFUE and HSPF2 guide explains the ratings in plain terms.
Should you install a heat pump instead of an AC?
If you are replacing your AC anyway, a ducted cold-climate heat pump is worth pricing. It installs in the same spot, cools exactly like an air conditioner, and also heats your home efficiently down to well below freezing. Your gas furnace stays as backup for the coldest nights (a “hybrid” or dual-fuel system).
| Central AC | Cold-climate heat pump | |
|---|---|---|
| Installed cost | $4,000 – $8,000 | $9,000 – $18,000 |
| Summer cooling | Yes | Yes, same comfort |
| Winter heating | No | Yes, with furnace backup at −25 °C |
| Effect on gas bill | None | Lower, since the furnace runs less |
| Rebate potential | Limited | Often eligible for programs |
The heat pump costs more up front, but rebates for heat pumps may be available through programs such as Ontario’s Home Renovation Savings Program. Program rules and amounts change, so Oria will check current programs for your home before you decide. See our heat pump cost guide and how heat pumps handle Ottawa winters for the full picture.
When a ductless mini-split makes more sense
Not every Ottawa home has ducts. Older homes in Westboro, the Glebe and rural properties heated by hot-water boilers or electric baseboards often have nowhere to put a central AC coil. Adding ductwork to a finished home is disruptive and expensive.
A ductless mini-split puts a slim wall unit in each zone, connected to one outdoor unit by a small line set through the wall. A single zone runs $3,500 – $6,500, and multi-zone systems with 2–4 heads run $7,000 – $16,000. Most mini-splits are heat pumps, so they also add efficient heating. Compare options in our ductless mini-split cost guide.
How to get an accurate AC quote (and avoid surprises)
- 1
Ask for an in-home visit.
A price over the phone without seeing the furnace, ducts and electrical panel is a guess.
- 2
Ask how the size was chosen.
The answer should involve your home’s square footage, windows, insulation and orientation, not just “same as the old one.”
- 3
Compare like for like.
Same tonnage, same SEER2, same compressor type, and the matching indoor coil included.
- 4
Check what is included.
Pad or bracket, line set, disconnect, refrigerant charge, removal of the old unit, permits where required, and thermostat compatibility.
- 5
Get warranty registration in writing.
Confirm who registers the equipment and the parts and labour terms.
- 6
Book early.
Spring quotes are calmer than the first 32 °C week in June, when every installer in Ottawa is backed up.
Oria gives free quotes on any equipment purchase, offers same-week installation, and completes many AC installs in a single day. Financing is available from $49/month on approved credit; see financing options.
Is it worth replacing an older AC now?
Central air conditioners in Ottawa typically last 12 to 20 years. Replacement usually makes sense when the unit is over 15 years old, runs on R-22, needs a compressor or coil, or struggles to hold temperature on humid days.
A good rule: if a repair costs more than about half of a new system, or the unit is past 12 years and the age × repair cost tops $5,000, put that money toward replacement. Our guide on whether to repair or replace your AC walks through the decision.
When you are ready, book a free in-home quote through our air conditioning installation page or call (613) 866-1869. Oria is family-owned, has served Ottawa since 2014, is a Lennox authorized dealer, and installs Goodman and all major brands.
Frequently Asked Questions
How much does a new central air conditioner cost in Ottawa?
Most Ottawa homes pay $4,000 to $8,000 for a central air conditioner replacement, installed, before rebates. Townhouses and simple swaps with reusable line sets sit near the low end. Larger homes, variable-speed units, new electrical work or duct changes push toward the top. Replacing the furnace and AC together typically costs $8,000 to $15,000.
What size air conditioner do I need for my Ottawa home?
Most Ottawa houses need between 1.5 and 4 tons of cooling, and many 1,800–2,400 sq ft homes fall around 2.5 to 3 tons. The right size depends on insulation, windows, sun exposure and air leakage, not square footage alone. An oversized unit short-cycles and leaves the house humid, so ask your contractor to size it from a proper load calculation.
Is a higher SEER2 air conditioner worth it in Ottawa?
Up to a point. Ottawa’s cooling season is short, so a mid-range 15–18 SEER2 unit usually gives the best value. Top-tier variable-speed units, rated up to about 22–26 SEER2, cost more and take longer to pay back on hydro savings. They are worth it if you value quiet operation, steady temperatures and stronger humidity control during muggy summers.
Can I keep my old furnace when I install a new AC?
Often yes, if the furnace is in good condition and under roughly 12–15 years old. The new AC needs a matched indoor coil on top of the furnace and relies on the furnace blower for airflow. If the furnace is near the end of its life or has a weak blower, replacing both at once for $8,000 to $15,000 can avoid paying for installation twice.
Are there rebates for air conditioners in Ottawa?
Rebates for standard central air conditioners are limited. Heat pumps, which also provide cooling, are more often eligible for programs such as Ontario’s Home Renovation Savings Program. Program rules and amounts change, so Oria will check what is currently available for your home and equipment before you choose. You can read more on our HVAC rebates page.
How long does an AC installation take?
A straightforward central AC replacement with existing ductwork and electrical is usually completed in one day. Jobs that need a new line set, new electrical circuit, duct changes or a furnace replacement at the same time can take one to two days. Oria offers same-week AC installation in most cases and completes many installs in a single day.
Should I get a heat pump instead of a central air conditioner?
If your budget allows, it is worth pricing both. A ducted cold-climate heat pump costs $9,000 to $18,000 installed versus $4,000 to $8,000 for an AC, but it also heats your home for much of the winter, with your gas furnace as backup on the coldest days. That lowers gas use, and heat pumps are more likely to qualify for rebate programs.
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