AC replacement cost by size (2026)
National typical installed prices for a condenser and matching indoor coil, before state adjustment and add-ons.
| Size | Standard 14.3–15 SEER2 | High 16–17 SEER2 | Premium 18+ SEER2 |
|---|---|---|---|
| 1.5 ton | $4,450 | $4,850 | $5,400 |
| 2 ton | $5,000 | $5,500 | $6,100 |
| 2.5 ton | $5,600 | $6,150 | $6,850 |
| 3 ton | $6,200 | $6,800 | $7,550 |
| 3.5 ton | $6,750 | $7,450 | $8,250 |
| 4 ton | $7,350 | $8,100 | $8,950 |
| 5 ton | $8,550 | $9,350 | $10,400 |
Does higher SEER2 pay off?
SEER2 measures how much cooling an AC delivers per unit of electricity over a season. Going from 14.3 to 17 SEER2 cuts cooling electricity by about 16%; going to 20 SEER2 cuts it by about 28%.
- In hot climates where cooling runs 2,000+ hours a year, a high-efficiency AC often pays back its extra cost in 6 to 10 years.
- In mild and northern climates, payback can take longer than the equipment's life. A standard unit is usually the better buy.
- Variable-speed premium units also control humidity better and run more quietly, which some homeowners value more than the savings.
Why the indoor coil is usually replaced too
A central AC is two matched parts: the outdoor condenser and the indoor evaporator coil on top of the furnace or air handler. Manufacturers rate efficiency and honor warranties only for approved combinations, and new A2L refrigerants (R-454B and R-32) are not compatible with old R-410A or R-22 coils. Replacing only the condenser saves $1,000–$2,000 up front but is rarely possible on a system more than a few years old.
Reading an AC quote
- Model numbers for both the condenser and the coil, so you can check the AHRI-rated combination and its SEER2.
- Line set: reused or new. Reuse is possible only if the old lines are the right size and can be flushed.
- Electrical: a new disconnect and whip are often required by code when the condenser is replaced.
- Permit and inspection, and who pulls it.
- Warranty: parts (usually 10 years when registered) and labor (1 to 10 years, depending on the contractor).
Frequently asked questions
How much does it cost to replace a central AC in 2026?
Most homeowners pay $4,700 to $8,000, about $6,200 typical, for a standard-efficiency 3-ton AC with a new coil, before line set, permit and other add-ons. Larger, higher-efficiency systems cost more.
How much is a 4-ton AC unit installed?
About $5,600 to $9,500 at standard efficiency, before add-ons and state adjustment.
Can I replace just the outdoor unit?
Only if the indoor coil is recent, matches the new condenser and uses the same refrigerant. With the switch to A2L refrigerants, most replacements now need both.
How long does an AC replacement take?
Usually one day for a like-for-like replacement. A new line set or electrical work can add a few hours.
When is the best time to replace an AC?
Spring and fall, when installers are less busy. Replacing a failing AC before summer avoids paying emergency rates in a heat wave.
These estimates are for budgeting only. Final prices depend on the brand, your home and local contractor rates.