Central AC Replacement Cost in 2026
A central AC replacement costs $5,300–$10,500 installed for most US homes in 2026, averaging about $5,980. Size and efficiency tier — not brand — explain most of the difference between quotes.
Quick answer: what it costs in 2026
| Central AC replacement (installed) | Low | Typical | High |
|---|---|---|---|
| Most central AC replacements | $5,300 | $5,980 | $10,500 |
| 3-ton system, standard efficiency | $5,800 | $6,800 | $7,800 |
| 3-ton system, high efficiency (19–21 SEER2 class) | $9,100 | $10,650 | $12,200 |
| 5-ton system, standard efficiency | $7,000 | $8,250 | $9,500+ |
Angi's national average across all AC replacements is $5,976 (July 2026 data); HomeGuide's installed range for a central system is $5,300–$10,500 before major ductwork. Tonnage and efficiency tier explain most of the spread between quotes.
Estimates based on published ranges from HomeGuide and Angi, checked November 9, 2026. Your local price will differ — see the regional table below and our research method.
A central AC replacement quote bundles three things: the outdoor condenser, the matched indoor coil, and a day of skilled labour — and it lands anywhere from $5,300 to well past $12,000 depending on two decisions, size and efficiency. This guide separates them. The installed ranges below are HomeGuide's 2026 published tables by tonnage and efficiency, cross-checked against Angi's national replacement data (average $5,976 across all system sizes).
Two 2026 context points. The industry has moved to SEER2 ratings (the DOE's newer test) and to new refrigerants (R-32 and R-454B replacing R-410A); equipment prices rose through that transition, which is one reason 2024-vintage numbers understate today's quotes. And the federal 25C tax credit expired for systems placed in service after December 31, 2025 — a 2026 install relies on state and utility rebates instead. Replacing the whole heating and cooling system at once is a bigger job with its own numbers: see the HVAC replacement guide and the furnace replacement guide.
What the price normally includes
- Outdoor condenser and matched indoor evaporator coil, sized to your home
- Removal and disposal of the old equipment, including refrigerant recovery
- Connection to existing ductwork, refrigerant lines and electrical service
- New pad, disconnect and thermostat connection
- Building permit and inspection where required
- Manufacturer's parts warranty (commonly 10 years when registered)
Central AC cost by size (tonnage)
| Unit size | Cooling capacity | Installed cost (standard efficiency) |
|---|---|---|
| 1.5 ton | 18,000 BTU | $4,700–$6,500 |
| 2 ton | 24,000 BTU | $5,000–$6,800 |
| 2.5 ton | 30,000 BTU | $5,400–$7,200 |
| 3 ton | 36,000 BTU | $5,800–$7,800 |
| 3.5 ton | 42,000 BTU | $6,200–$8,300 |
| 4 ton | 48,000 BTU | $6,500–$8,800 |
| 5 ton | 60,000 BTU | $7,000–$9,500+ |
Tonnage bands are HomeGuide's published basic installed ranges, ductwork excluded. One ton equals 12,000 BTU and serves roughly 500–600 sq ft as a rule of thumb — a starting point only. The right size comes from a load calculation (Manual J); an oversized unit costs more, cools worse and dies younger.
Central AC cost by efficiency (SEER2)
| Efficiency tier | Installed cost | Notes |
|---|---|---|
| Standard (≈14 SEER2) | $5,300–$7,900 | At or near the federal minimum; single-stage |
| Mid (15–16 class) | $6,700–$9,300 | The common quote tier; some two-stage models |
| High (17–18 class) | $7,500–$10,600 | Two-stage; quieter, better humidity control |
| Premium (19–21 class) | $9,100–$12,200 | Variable-speed; lowest running costs |
| Top tier (22+ class) | $11,400–$17,300+ | Flagship variable-speed systems |
Efficiency bands are HomeGuide's published installed ranges (listed there on the SEER scale; SEER2 equivalents sit roughly 0.5–1 point lower for the same equipment). Stepping up one tier on a 3-ton system adds roughly $1,000–$1,800 installed and cuts cooling energy use by about 8–12% per tier — worth most in hot climates with long cooling seasons.
What drives the price up or down
Ductwork
Every table above assumes sound existing ducts. New ductwork or major modification is the largest common extra, and leaky or undersized ducts can strand a new unit's efficiency — ask for a duct inspection line before you sign, not after.
Matched systems
The condenser and indoor coil must be a rated match to deliver the efficiency on the label and keep the warranty clean. Quotes that pair a new condenser with an old coil should show how the rating and warranty are affected.
Electrical and refrigerant lines
Panel upgrades, long line sets and attic air handlers add labour. New systems use R-32 or R-454B refrigerant; line sets from an R-410A system are often flushed or replaced, which should appear as a line item, not a surprise.
Season
AC fails in heat waves, and so does pricing power. A still-running system replaced in spring or autumn usually draws sharper quotes and faster scheduling than the same job in July.
Cost by region
| Region | Typical range (3-ton class) | Why |
|---|---|---|
| South / Southeast | $5,400–$8,600 | High volume, competitive market; highest minimum efficiency tier |
| Midwest | $5,200–$8,200 | Near national average; shorter cooling season |
| Northeast | $6,200–$10,400 | Higher labour; more ductless competition at the top end |
| West Coast | $6,400–$11,000 | Highest labour costs; heat-pump conversions common |
Regional bands are compiled from the regional spreads published in national cost guides (HomeGuide, Angi). They are variation bands around the national figures, not official state statistics — your metro can sit outside them.
Ways to keep the cost down
- Get three quotes in the shoulder season if the system still runs — July pricing is desperation pricing.
- Insist on a load calculation; paying for a 4-ton unit where a 3-ton suffices wastes money twice, at purchase and on every bill.
- Take the mid-efficiency tier unless your cooling season is long; premium tiers pay back in Phoenix faster than in Portland.
- Check utility and state rebates before signing — with the federal credit gone, these are the remaining incentives and some require pre-approved models.
- Ask whether the quote includes permit, pad, disconnect and refrigerant-line work; compare quotes line by line.
- Register the warranty within the manufacturer's window — unregistered units often carry half the parts coverage.
Frequently asked questions
How long does a central AC system last?
Typically 15–20 years; coastal salt air and neglected maintenance shorten that, and units in mild climates often run longer. Rising repair frequency and refrigerant issues on R-22 systems are the usual replacement triggers.
Should I replace my AC and furnace at the same time?
If both are near end of life, usually yes: the systems share the blower and ductwork, labour overlaps, and matched equipment keeps efficiency ratings and warranties clean. If the furnace is under 10 years old, a cooling-only replacement is normally the right scope.
What is SEER2, and what rating should I buy?
SEER2 is the DOE's current efficiency test, adopted in 2023; the same unit scores slightly lower on it than on the old SEER scale. Federal minimums are roughly 13.4–14.3 SEER2 depending on region. Most buyers land at 14.3–16 SEER2; higher tiers pay back fastest in hot climates.
How long does AC replacement take?
A like-for-like condenser and coil swap is normally one day. Duct modifications, electrical work or an air-handler replacement can extend it to two or three days.
Is there a tax credit for a new AC in 2026?
No federal credit: the 25C Energy Efficient Home Improvement Credit expired for equipment placed in service after December 31, 2025. State programmes and utility rebates still exist in many areas and are worth checking before purchase.
Repair or replace — how do I decide?
A common rule of thumb: multiply the repair quote by the system's age in years; if the result passes about $5,000, replacement is usually the better spend. A failed compressor on a 15-year-old unit almost always means replace; a capacitor on a 6-year-old unit almost always means repair.
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Typical: $2.60/watt · 7 kW ≈ $18,200Sources: HomeGuide central air conditioner cost guide (2026; installed ranges by tonnage $4,700–$9,500+ and by efficiency tier $5,300–$17,300+); Angi AC replacement cost data (updated July 2026; national average $5,976). Full source list and methodology: How we research. Spotted a price that looks wrong in your area? Tell us — we re-check reader-flagged figures first.