Quick answer: A new central air conditioner usually costs $3,000–$8,000 installed. A 3-ton system costs about $3,000–$6,500, a 5-ton about $4,000–$8,000, and very high efficiency (22–26 SEER) systems run $6,000–$11,000.
AC Cost by Size
| System size | Typical home size* | Installed cost |
|---|---|---|
| 1.5 ton | 600–900 sq ft | $2,000–$5,000 |
| 2 ton | 900–1,200 sq ft | $2,500–$5,500 |
| 2.5 ton | 1,200–1,500 sq ft | $2,700–$6,000 |
| 3 ton | 1,500–1,800 sq ft | $3,000–$6,500 |
| 3.5 ton | 1,800–2,100 sq ft | $3,100–$7,000 |
| 4 ton | 2,100–2,400 sq ft | $3,500–$7,500 |
| 5 ton | 2,400–3,000 sq ft | $4,000–$8,000 |
*Using the rough 20 BTU per sq ft rule. Prices from PickHVAC’s replacement cost guide.
AC Cost by Efficiency
| SEER | Installed cost | Unit only |
|---|---|---|
| 13–14 | $2,500–$6,000 | $1,000–$4,200 |
| 15–16 | $3,000–$7,500 | $1,500–$5,700 |
| 17–18 | $3,500–$8,600 | $1,800–$6,100 |
| 19–21 | $4,000–$10,000 | $2,500–$7,500 |
| 22–26 | $6,000–$11,000 | $3,700–$8,500 |
Skip the math: choose your tonnage (or home size) and SEER for a combined estimate. Open the free AC Replacement Cost Calculator →
What Is and Isn’t Included
These prices cover the outdoor condenser, indoor coil and standard installation. Extra costs can include a new furnace or air handler, ductwork repairs, electrical upgrades, a new line set or pad, and permits.
Is Higher SEER Worth It?
Higher-SEER systems use less electricity. In hot climates with long cooling seasons, savings add up faster. Estimate running costs with the electricity cost calculator, and look for federal tax credits and utility rebates on high-efficiency equipment.
Don’t Oversize
Bigger is not better. An oversized AC short-cycles and leaves the house clammy. Ask for a Manual J load calculation, or start with our BTU calculator for single rooms.
Ways to Save
- Replace in spring or fall when contractors are less busy.
- Get three quotes for the same brand tier and SEER.
- Seal and insulate ducts in hot attics.
- Consider a heat pump if you also need heating.
Repair or Replace?
A common rule is to multiply the repair cost by the system’s age. If the result is more than about $5,000, replacement often makes more sense. Systems older than 12–15 years, systems using phased-out R-22 refrigerant, and units needing a new compressor are strong replacement candidates.
Signs Your AC Needs Replacing
- It no longer keeps the house cool on hot days.
- Energy bills have risen without a change in use.
- Frequent repairs or refrigerant leaks.
- Loud noises, short cycling or high indoor humidity.
Central AC vs Heat Pump vs Mini-Split
| System | Cools | Heats | Best for |
|---|---|---|---|
| Central AC | Yes | No (paired with furnace) | Homes with ducts and a good furnace |
| Heat pump | Yes | Yes | Replacing both AC and electric or old heating |
| Ductless mini-split | Yes | Yes | Homes without ducts, additions, single rooms |
If you are replacing your heating too, compare sizes with the heat pump size calculator.
What to Ask Installers
- Will you do a Manual J load calculation?
- Is the indoor coil or air handler being replaced to match the new condenser?
- What warranty covers parts and labor?
- Are permits, disposal and a new pad included?
- What rebates or tax credits apply?
Sources
Frequently Asked Questions
How much does a 3 ton AC unit cost installed?
About $3,000–$6,500 for a standard system.
How much is a new AC for a 2,000 sq ft house?
Typically a 3.5-ton system costing about $3,100–$7,000 installed, more for high efficiency.
How long does a central AC last?
Usually 12–17 years with regular maintenance.
Should I replace my furnace at the same time?
If the furnace is old, replacing both together ensures matched equipment and can save on labor.
What SEER rating should I buy?
Since 2023 the federal minimum for new central AC is 13.4 SEER2 in the North and 14.3 SEER2 in the South and Southwest. Going a step or two above the minimum is a good value in hot climates.
Related Guides
- How Much Does a Kitchen Remodel Cost in 2026?
- How Much Does a Bathroom Remodel Cost in 2026?
- What Size Wire Do I Need? Amps, Distance and Voltage Drop
Try the free AC Replacement Cost Calculator or browse all home improvement calculators.