AC Installation & Replacement Cost
Updated 2026 · National average (USD)
Installed central AC, typical home. Larger homes, high-SEER systems and ductwork changes cost more.
Installing a new central air conditioner typically costs between $3,900 and $8,000, fully installed. The biggest cost drivers are system size (measured in tons), efficiency (SEER2 rating), and whether your ductwork needs modification. Use the size calculator below to estimate the tonnage your home needs before you get quotes.
Central AC cost by system size
| Item | Typical cost |
|---|---|
| 2 ton (up to ~1,200 sq ft) | $3,500 – $5,500 |
| 3 ton (~1,200–1,800 sq ft) Most common | $4,200 – $6,500 |
| 4 ton (~1,800–2,400 sq ft) | $5,000 – $7,500 |
| 5 ton (~2,400–3,000 sq ft) | $6,000 – $9,000 |
| High-efficiency (18+ SEER2) upgrade Added over base cost | $1,000 – $3,000 |
What affects the cost
- System size (tonnage) — right-sizing matters; oversized units waste money and cool poorly.
- SEER2 efficiency — higher rating costs more upfront but lowers energy bills.
- Ductwork — repairs or new runs add cost; a ductless mini-split avoids this.
- Removal of the old system and permits are usually included in a full quote.
What Size AC & Furnace Do You Need?
Your local climate changes the heating and cooling load for your home. This estimate uses a national mixed baseline — for a location-specific result, open your state page. Enter your details for a quick sizing estimate (BTU, tonnage and a recommended SEER2 range).
Actual equipment sizing requires a professional Manual J load calculation. This tool provides a rough estimate for general informational purposes only and is not professional advice, a guarantee, or a quote. Results may not reflect your specific situation. Always confirm with a licensed HVAC professional before making any purchase or decision. See our Terms of Service for details.
Get real prices for your home
The only way to know your true cost is a local quote. Compare free estimates from licensed HVAC pros near you.
Find HVAC pros near you →Frequently Asked Questions
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Related cost guides
Cost figures are national average estimates for 2026 and vary by region, brand, equipment efficiency and labor rates. This guide is informational, not a quote — always confirm with a licensed contractor.