How Much Does It Cost to Replace a Central Air Conditioner in 2026?
Your old air conditioner dies in the middle of a heatwave, and the first quote feels like a second mortgage payment.
Two neighbours can pay wildly different amounts for what looks like the same job. The difference is almost always size and efficiency — and once you know those two numbers, the price makes sense.
The Quick Answer
Replacing a central air conditioner in 2026 costs $4,500 to $12,000 installed for most homes, according to teamenoch's 2026 cost guide. Most homeowners pay around $6,500 to $8,500 for a mid-efficiency 3-ton system with standard installation.
The three biggest cost drivers are the size of the unit (measured in tons), its efficiency rating (SEER2), and whether your ductwork needs work. Use this simple formula to budget:
Total = equipment + installation labour + permit + ductwork (if needed) + old unit removal
Equipment is usually about half to two-thirds of the total; labour, permits, refrigerant, and disposal make up the rest.
Central AC Replacement Cost by Tonnage and SEER Rating
This is the table most cost guides skip — and it is the one that matters, because tonnage and SEER2 together decide most of your price.
Tonnage is the cooling capacity of the unit. A "ton" of cooling equals about 12,000 BTU per hour. SEER2 is the efficiency rating: a higher number means lower electricity bills, but a higher upfront price.
The ranges below are installed prices, built from the teamenoch, HomeGuide, Angi and Trane ranges checked Nov 2, 2026. Standard efficiency means about 14–15 SEER2, mid means 16–17 SEER2, and high means 18 SEER2 or above. All prices below are national US estimates; your quote will vary by region, home size, and ductwork condition.
| Unit size | Standard (14–15 SEER2) | Mid (16–17 SEER2) | High (18+ SEER2) |
|---|---|---|---|
| 2 ton | $4,500 – $6,500 | $5,000 – $7,500 | $6,500 – $9,000 |
| 2.5 ton | $5,000 – $7,000 | $5,500 – $8,000 | $7,000 – $9,500 |
| 3 ton | $5,800 – $7,800 | $6,500 – $9,000 | $8,000 – $11,000 |
| 3.5 ton | $6,500 – $8,800 | $7,500 – $10,000 | $9,000 – $12,000 |
| 4 ton | $7,000 – $10,000 | $8,000 – $11,500 | $10,000 – $13,500 |
| 5 ton | $9,000 – $12,000 | $10,000 – $13,500 | $12,000 – $15,000+ |
A few patterns to notice. Moving up one ton adds roughly $500 to $1,500, and moving from standard to mid efficiency adds about 10% to 15%. Jumping to high efficiency adds about 25% to 40% over standard — which is why it only pays off if you run the AC hard for many months a year or plan to stay in the home for a decade or more.
How to Know What Size You Need
As a rough rule of thumb, most homes need about 1 ton per 500 to 600 square feet of cooled space:
| Home size | Typical AC size | Installed cost range |
|---|---|---|
| Up to 1,200 sq. ft. | 1.5 – 2 ton | $4,500 – $6,500 |
| 1,200 – 1,800 sq. ft. | 2.5 – 3 ton | $5,500 – $8,000 |
| 1,800 – 2,500 sq. ft. | 3.5 – 4 ton | $7,000 – $10,000 |
| 2,500+ sq. ft. | 4.5 – 5 ton | $9,000 – $12,000+ |
This is only a starting point. Insulation, ceiling height, window area, and climate matter just as much as square footage. A good contractor runs a Manual J load calculation — a proper sizing calculation that accounts for insulation, windows, orientation, and climate — before recommending a size. If a contractor sizes your unit from square footage alone, that is a red flag. Bigger is not better: an oversized unit cools too fast, shuts off before removing humidity, and cycles on and off constantly, which wears it out faster and leaves the house feeling clammy.
Central AC Replacement Cost by Brand Tier
Brand matters less than size and efficiency, but it still moves the price:
| Tier | Brands | Installed price range | Best for | |---|---|---| | Budget | Goodman, Amana, York | $4,500 – $7,500 | Replacing an ageing system without overspending | | Mid-range | Rheem, American Standard, Bryant | $5,500 – $9,000 | Reliable performance at a fair price | | Premium | Trane, Lennox, Carrier | $7,000 – $12,000+ | Long-term efficiency and quiet operation |
Premium brands usually come with longer warranties and quieter operation. Budget brands can be perfectly reliable, especially if the installation is done well — and installation quality matters more than the badge on the box. A badly installed premium unit will underperform a well-installed budget unit every time. Trane's own guide puts its national average at $6,958 to $13,418 installed, which sits at the top end of the market.
Worked Example: Replacing a 3-Ton System in a 1,800 Sq. Ft. Home
Here is a common job: a 1,800-square-foot home, replacing a 15-year-old 3-ton unit with a new 3-ton, 16 SEER2 mid-efficiency system, using the existing ductwork.
Using the middle of the ranges checked Nov 2, 2026:
- Equipment (3-ton, 16 SEER2, mid-range brand): about $3,800
- Installation labour: about $1,500 to $2,000
- Permit: $250 to $400, according to Angi
- Old unit removal and disposal: $200 to $400
- New thermostat (if needed): $150 to $300
Total: roughly $6,900 to $7,700, which lines up with HomeGuide's $5,800 to $7,800 range for a 3-ton system and teamenoch's $6,500 to $8,500 figure for a typical mid-efficiency 3-ton job.
Now change two things and watch the price move. Upgrade the same 3-ton system to 18+ SEER2 and the equipment alone can add $1,500 to $2,500. Add full ductwork replacement and you add $1,500 to $5,000 more. That is how a $7,000 job becomes a $12,000 job — and why you should always ask for an itemised quote.
What Else Affects the Price?
Ductwork. Replacement is not included by default. Inspection is usually included, but repairs or full replacement are quoted separately — expect $1,500 to $5,000 if your ducts need work, according to teamenoch. Duct sealing alone costs $500 to $2,000, and leaky ducts can cut efficiency by as much as 30%.
Furnace or air handler. Replacing both together typically costs $8,000 to $16,000 for a complete AC plus furnace system — more upfront, but cheaper than doing them separately, and the parts are matched to work together.
Permits, electrical work, and location. Angi lists permits at $250 to $400. Older homes sometimes need an electrical panel upgrade, which can add several hundred to a few thousand dollars. Labour is a large share of the bill, so the same system can cost 20% to 30% more in a high-cost coastal city than in a smaller inland market. Replacing an AC in spring or autumn, when HVAC companies are quieter, can mean faster scheduling and occasionally a better price — emergency replacements in a July heatwave are the most expensive way to buy one.
Repair or Replace?
A new system is a big spend, so check whether a repair makes more sense. Repair it if the unit is under 10 years old, the repair costs less than about 20% of a replacement, and it has not needed frequent repairs. Replace it if the unit is over 12 to 15 years old, uses the old R-22 refrigerant (phased out and expensive to top up), needs a repair costing $1,500 or more, or your summer electricity bills keep climbing. A common rule of thumb: if the repair cost multiplied by the age of the unit is more than about $5,000, replacement usually wins.
How to Get an Accurate Price
Get at least three written quotes, each listing equipment, labour, permit, ductwork, and disposal separately. Ask each contractor what size the Manual J calculation recommended, what SEER2 rating is quoted and what the next tier up costs, whether ductwork inspection is included, what warranty covers parts, labour, and the compressor, and whether any rebates or tax credits apply. Check that the contractor is licensed and insured, and read recent reviews.
Frequently Asked Questions
How much does it cost to replace a central air conditioner?
Most homeowners pay $4,500 to $12,000 installed in 2026, with around $6,500 to $8,500 typical for a mid-efficiency 3-ton system, according to teamenoch. High-efficiency systems and ductwork replacement can push the total past $12,000.
How much does a 3-ton AC unit cost to replace?
About $5,800 to $7,800 installed at standard efficiency, according to HomeGuide. Mid-efficiency 16 SEER2 systems run about $6,500 to $9,000, and high-efficiency 18+ SEER2 systems run about $8,000 to $11,000.
Does central AC replacement include ductwork?
Not by default. Inspection is usually included, but repairs or full replacement are quoted separately — expect $1,500 to $5,000 if your ducts need work. Sealing leaky ducts alone costs $500 to $2,000.
How long does a central AC last?
A well-maintained central AC typically lasts 12 to 15 years, and some reach 20 years. After about 15 years, efficiency drops and repairs become more frequent, which is when replacement usually makes more financial sense than another repair.
How long does installation take?
A straightforward like-for-like replacement usually takes one day. Jobs that need ductwork changes, electrical upgrades, or a furnace replacement can take two to three days.
Sources: teamenoch, This Old House, Angi, HomeGuide, Trane and Carrier central AC cost guides. Prices are national US estimates checked Nov 2, 2026, and are not a quote for your home.