Cost by system size
| Size | Typical home | Installed cost (outdoor unit + coil) |
|---|---|---|
| 2 tons | ~900–1,200 sq ft | $3,800–$6,500 |
| 3 tons | ~1,400–1,900 sq ft | $4,500–$7,500 |
| 4 tons | ~2,000–2,500 sq ft | $5,500–$8,500 |
| 5 tons | ~2,500+ sq ft | $6,000–$10,000+ |
Square footage is only a rough guide. Proper sizing requires a Manual J load calculation.
Cost by efficiency
- Federal minimum (13.4/14.3 SEER2), single-stage: lowest cost.
- 15–17 SEER2, two-stage: typically $1,000–$2,500 more.
- 18+ SEER2, variable-speed: typically $3,000–$6,000 more.
Higher efficiency pays back fastest in hot climates with long cooling seasons and high electricity prices.
What a quote should include
- Outdoor condenser and a matched indoor evaporator coil
- Refrigerant line set (new or properly flushed)
- Pad, disconnect, electrical whip and condensate connections
- Permit, removal and disposal of old equipment, and refrigerant recovery
- Startup, charge verification and warranty registration
Possible extra costs
| Item | Typical cost |
|---|---|
| New line set | $500–$1,500 |
| Electrical upgrades | $300–$2,000 |
| Ductwork repair or modification | $500–$5,000+ |
| New air handler or furnace | $2,000–$6,000+ |
How to save money
- Get three quotes and compare like for like.
- Ask about utility rebates and manufacturer promotions.
- Consider a heat pump instead. The price difference is often small, and you gain efficient heating.
- Don't oversize. A smaller, right-sized system costs less and performs better.
Frequently asked questions
How long does a new AC last?
Typically 12–17 years with regular maintenance. Coastal salt air and very long cooling seasons can shorten that.
Can I replace just the outdoor unit?
Sometimes, but with refrigerant changes and efficiency matching, a new matched indoor coil is usually required.
