AC Unit Replacement Cost (2026 Guide)
Quick answer
Replacing a central air conditioner costs about $4,700 to $7,800 for a typical 3-ton, standard-efficiency system in 2026. Smaller 2-ton systems start around $4,000, and large 5-ton systems run up to about $10,000. High-efficiency models add $2,500 to $5,000.
When an air conditioner dies in July, most people just want it fixed fast. Knowing the normal price range ahead of time helps you avoid paying too much in a rush. This guide covers what a new central AC costs, what changes the price, and how to pick the right size.
For a quick estimate based on your home, use our AC replacement cost calculator.
AC replacement cost by size
| AC size | Cooling capacity | Typical home size* | Installed cost |
|---|---|---|---|
| 2 ton | 24,000 BTU | 1,000 – 1,400 sq ft | $4,000 – $6,500 |
| 2.5 ton | 30,000 BTU | 1,300 – 1,700 sq ft | $4,400 – $7,100 |
| 3 ton | 36,000 BTU | 1,600 – 2,000 sq ft | $4,700 – $7,800 |
| 3.5 ton | 42,000 BTU | 1,900 – 2,300 sq ft | $5,100 – $8,500 |
| 4 ton | 48,000 BTU | 2,200 – 2,700 sq ft | $5,500 – $9,000 |
| 5 ton | 60,000 BTU | 2,700 – 3,300 sq ft | $6,200 – $10,000 |
Cost by efficiency (SEER2)
Since 2023, new air conditioners are rated in SEER2. A higher number means the unit uses less electricity for the same cooling.
| Efficiency level | SEER2 | Extra cost |
|---|---|---|
| Standard | 14.3 – 15 | — |
| Mid | 16 – 17 | +$800 to $2,000 |
| High (variable speed) | 18 and up | +$2,500 to $5,000 |
High efficiency pays back fastest in hot climates where the AC runs most of the year, such as Texas, Florida and Arizona. In cooler states, a standard unit is often the better value.
Replacing more than the AC
- Heat pump instead of AC: about $1,500 to $3,500 more than an AC alone. A heat pump heats and cools.
- AC and gas furnace together: about $8,000 to $14,000 for a typical home. Replacing both at once saves a second labor visit, and the two units are matched.
- Ductwork repairs: sealing or minor repairs add about $500 to $2,000.
Repair or replace?
A simple rule many technicians use: multiply the age of the unit by the repair cost. If the result is more than $5,000, replacement is usually the better value. Replacement also makes sense when:
- The system is 12 to 15 years old or older
- The compressor has failed
- It uses R-22 refrigerant, which is no longer made in the US
- Your energy bills keep going up even with regular maintenance
How to get a fair price
- Ask for a Manual J load calculation. It tells the installer the right size for your home.
- Get at least three itemized quotes that list the brand, model number and SEER2 rating.
- Check whether permits, a new thermostat and removal of the old unit are included.
- Ask about utility rebates. Many power companies offer rebates for efficient systems.
Frequently asked questions
How long does AC replacement take?
A straight swap of an outdoor unit and coil usually takes one day. Jobs that include new ductwork or a furnace can take two to three days.
How long does a central AC last?
Most central air conditioners last about 12 to 15 years with regular maintenance. Units in very hot climates often wear out sooner.
Is a bigger AC better?
No. An oversized unit cools the air quickly but turns off before it removes enough humidity. Rooms feel cold and clammy, and the unit wears out faster.
Sources: CostCandor, FixupFirst, RefCon HVAC. Prices are national planning ranges, not quotes. See how we research costs.
