How Much Does AC Replacement Cost?
By the HomeLintel Editorial Team · Reviewed 2026-08-24
Replacing a central air conditioner typically costs $4,500–$12,500, with most homes landing around $7,500 for a 3-ton system including the outdoor condenser, matched indoor coil, and installation.
One 2026-specific factor: the refrigerant transition. New systems now ship with R-454B or R-32 (replacing R-410A under the federal HFC phasedown). Early-cycle equipment and refrigerant costs run somewhat higher, and topping off an old R-410A system has gotten pricier every year — which quietly shifts the repair-vs-replace math toward replacement on older units with leaks.
Cost breakdown: 3-ton central AC
| Item | Typical range | Notes |
|---|---|---|
| Condenser unit | $2,200 – $5,500 | 14.3 SEER2 single-stage to 17+ SEER2 variable-speed. |
| Evaporator coil (matched) | $600 – $1,500 | Required match — reusing an old coil with a new condenser is false economy. |
| Labor | $1,500 – $3,500 | Removal, set, lineset work, vacuum, charge, commissioning. |
| Lineset & code items | $200 – $1,000 | New lineset on refrigerant changeovers, disconnect, surge, pad. |
| Permit | $100 – $400 | Mechanical permit in most jurisdictions. |
Sizing: bigger is not better
An oversized AC short-cycles: it cools air fast but runs too briefly to dehumidify, leaving homes cold-but-clammy while wearing the compressor. Insist on a Manual J load calculation rather than matching the old unit's size — homes gain insulation, windows, and air sealing over decades, and many old units were oversized on day one. Roughly, homes need one ton per 500–700 sq ft, but the calc is the answer, not the rule of thumb.
Efficiency tiers: where the payback lives
Jumping from a failed 10–13 SEER unit to today's minimum 14.3 SEER2 already cuts cooling energy meaningfully. The step from minimum to mid-tier (15.2–16 SEER2, two-stage) typically costs $800–$1,500 more and pays back in hot climates while improving humidity control. Top-tier variable-speed (17+ SEER2) is a comfort product first and an economy product second — quieter, steadier, better dehumidification — and pencils out mainly in long cooling seasons.
Repair or replace?
The decision drivers: age (past 12 years, major repairs stop making sense), refrigerant (an R-410A leak repair plus recharge can run $1,500–$3,000 at current prices — on an old unit that money belongs toward replacement), and compressor failure out of warranty (effectively a replacement verdict). Capacitors, contactors, and fan motors ($150–$700) are worth fixing at any age.
Frequently asked questions
How much is a new AC unit for a 2,000 sq ft house?
Typically a 3 to 3.5-ton system at $6,000–$11,000 installed depending on efficiency tier and region — assuming ducts and air handler stay. Add duct repairs if returns are undersized.
Why is AC replacement so expensive now?
Three real reasons: the R-454B/R-32 refrigerant transition raised early-cycle equipment costs, SEER2 minimums raised the efficiency floor, and refrigerant-handling labor is certified, insured trade work. Quotes vary widely though — always get three.
Can I replace just the outdoor unit?
Only with a verified-matched indoor coil, and never across refrigerant types. Mismatched pairs lose efficiency, strain compressors, and void warranties. On a changeover to R-454B, plan on coil and usually lineset replacement together.
How long do central air conditioners last?
12–17 years typically. Coastal corrosion, poor airflow from dirty filters/ducts, and oversizing shorten life; shaded placement and annual service extend it.
Related resources
Sources & methodology
- US DOE — Central Air Conditioning — sizing and efficiency
- US EPA — HFC Phasedown (AIM Act) — refrigerant transition context
Cost ranges are HomeLintel editorial estimates built from the listed sources and our published assumptions — they are not quotes. Last reviewed 2026-08-24. See how we estimate costs.