How Much Does It Cost to Replace a Central AC Unit?
$4,000 – $12,000
National average: $6,500 installed
Estimate your cost
Adjust the options for a tailored ballpark — figures and the regional adjustment are approximate estimates. Always confirm with local quotes before you budget.
When the central air gives out in a heat wave, the replacement quote lands fast and high. Replacing a central AC costs $4,000 to $12,000 in 2026, averaging around $6,500 — and that’s for the cooling side only, not a whole HVAC system.
What you’re paying for
A proper AC replacement is more than the outdoor box. It includes the condenser (outdoor unit), a matched evaporator coil indoors, labor, electrical, often a new refrigerant lineset, a thermostat, and permits. Pairing a new condenser with an old, mismatched coil is a common corner-cut that hurts efficiency and warranties.
Cost by size and efficiency
Two variables move the price most: tonnage (your home’s cooling load) and SEER2 (efficiency). The table below shows typical installed pricing by size, plus the premium for a high-efficiency unit.
AC-only vs. full HVAC
This guide is for replacing the air conditioning when the furnace or air handler is still good. If both are aging, replacing them together (a full HVAC project) costs more upfront but saves a second labor charge and guarantees the components are matched. If only the AC failed, AC-only is the smart spend.
A note on refrigerant
The industry has shifted to newer, lower-GWP refrigerants, and older systems use phased-out types that are increasingly expensive to service. If your unit is old and leaking refrigerant, that alone often justifies replacement rather than repeated recharges.
How to save on central AC
- Get three itemized quotes and compare the same tonnage and SEER2.
- Right-size with a Manual J instead of oversizing.
- Seal ductwork so a new unit performs as rated.
- Install in the off-season (spring or fall) for better pricing.
| Component | Typical range | Notes |
|---|---|---|
| AC condenser (outdoor unit) | $1,500 – $4,000 | — |
| Evaporator coil | $600 – $1,500 | — |
| Installation labor | $1,200 – $3,000 | — |
| Refrigerant lineset & electrical | $300 – $1,500 | — |
| Permits & thermostat | $150 – $700 | — |
| Option | Typical range | Notes |
|---|---|---|
| 2-ton (up to ~1,200 sq ft) | $3,500 – $6,000 | — |
| 3-ton (~1,500–1,800 sq ft) | $4,500 – $8,000 | — |
| 4–5 ton (~2,000–3,000 sq ft) | $6,000 – $10,000 | — |
| High-efficiency (high SEER2) | +$2,000 – $4,000 | Premium over standard |
What affects the price
- Size (tonnage) AC is sized in tons to your home's cooling load; bigger units cost more to buy and install.
- Efficiency (SEER2) Higher-SEER2 units cost more upfront but lower summer electric bills.
- Ductwork condition Leaky or undersized ducts may need sealing or modification, adding cost.
- Coil & lineset A matched evaporator coil and (sometimes) a new refrigerant lineset are part of a proper install.
- Region & season Labor rates and demand peak in summer; off-season installs are often cheaper.
Frequently asked questions
- Is replacing just the AC cheaper than a full HVAC system?
- Yes. Replacing the central AC (condenser + coil) runs $4,000–$12,000, while a full system that also includes a new furnace or air handler costs more. If only the AC has failed and the furnace is healthy, AC-only is the economical choice.
- How long does a central AC last?
- A well-maintained central AC lasts 12–17 years. Past 12, a major repair (especially a compressor or coil) usually tips the math toward replacement.
- Is a high-SEER2 AC worth it?
- In hot climates with heavy cooling use, a higher-SEER2 unit can pay back through lower bills. In mild climates, a standard-efficiency unit is usually the better value.
- What size AC do I need?
- Sizing comes from a Manual J load calculation, not a rule of thumb. An oversized AC short-cycles, cools unevenly, and wastes energy.
- Can I reuse my existing ductwork?
- Often yes, if it's well-sealed and correctly sized. A good installer inspects the ducts; leaky or undersized ducts undercut even a top-tier new unit.
- What are the signs my AC needs replacing?
- Warm air, weak airflow, frequent repairs, rising bills, loud operation, and age past 12 years all point to replacement — especially if it still uses an older refrigerant.
- Should I replace the furnace at the same time?
- If your furnace is also near the end of its life, replacing both together saves a second labor charge and ensures the blower and coil are properly matched.
How we estimate: ranges reflect typical U.S. pricing for materials and professional installation, compiled and cross-checked against the current (2026) industry sources listed below (see our data & methodology). Your actual cost depends on your location, project size, material grade, and local labor rates — always get multiple written quotes before you commit.
Sources
Cost ranges on this page were checked against current (2026) data from these industry sources:
- Air Conditioner Replacement Cost in 2026: 6 Ways to Save — NerdWallet
- How Much Does AC Replacement Cost? (2026) — HomeGuide
- Air Conditioner Prices in 2026 — Carrier