How much does central air installation cost?
Installing central air conditioning typically costs $3,900–$8,000 for a home with existing ductwork, including the condenser, evaporator coil and labor. Adding or replacing ducts pushes a job to $10,000–$15,000+.
Ranges are typical planning guides — actual price varies by region, access, materials and your local pro. Always get a written quote.
| Scenario | Typical cost | Notes |
|---|---|---|
| Replace AC, existing ducts | $3,900–$6,500 | Condenser + coil swap |
| Larger home / high-SEER unit | $6,500–$8,000+ | 4–5 ton or SEER2 16+ |
| Add ductwork | +$3,000–$7,000 | New or replacement runs |
| Electrical / permit | $250–$800 | New circuit, disconnect, permit |
What affects the price
System size (tonnage)
Most homes need a 2–4 ton unit — roughly one ton per 500–600 sq ft, adjusted for climate and insulation. Each extra ton adds $500–$1,000 to the equipment price.
Efficiency rating (SEER2)
A baseline SEER2 14 unit is cheapest upfront; SEER2 16–18 units cost $1,000–$2,500 more but cut cooling bills and may qualify for rebates.
Ductwork condition
If your ducts leak, are undersized, or don't exist, that's the single biggest add-on — new ductwork alone runs $3,000–$7,000.
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How much does central air installation cost?
Typically $3,900–$8,000 installed when ductwork is already in place. Homes that need new or replacement ducts usually land at $10,000–$15,000+.
How long does central air installation take?
A straight replacement takes one day. A first-time install with new ductwork usually takes 3–5 days.
Is a bigger AC unit better?
No — an oversized unit short-cycles, cools unevenly and wears out faster. A proper load calculation (Manual J) sizes it to your home, not a rule of thumb.