AC Replacement Cost
Written and reviewed by the HomeCostGuide editorial team
Quick answer
$5k–$13kinstalled, central air
Most homeowners can expect to pay $4,800–$12,500 to replace a central air conditioner. System size (tonnage) and efficiency rating are the main drivers, along with any ductwork or electrical work needed.
Cost by project size
| Project size | Typical range |
|---|---|
1.5–2 ton (smaller home) | $4,800–$7,000 |
3 ton (typical mid-size home) | $6,500–$9,500 |
4–5 ton (larger home) | $9,000–$12,500 |
Cost by material
| Material | Typical range |
|---|---|
Standard efficiency (14–15 SEER2) | $4,800–$7,500 |
High efficiency (16–18 SEER2) | $7,000–$10,500 |
Variable-speed / premium tier | $10,000–$12,500 |
Labor cost
Labor typically accounts for 25–40% of the total project cost. Labor share rises when ductwork needs modification or the electrical panel requires an upgrade to support the new unit.
Regional considerations
Hot, humid climates typically call for larger or higher-efficiency systems and see heavier seasonal demand on installers, which can affect both price and scheduling.
What affects the price
- Correct sizing
- System size should come from a Manual J load calculation based on your home, not just a like-for-like swap — an oversized unit cycles inefficiently.
- Efficiency rating (SEER2)
- Higher-efficiency units cost more upfront but lower operating costs over the system's lifespan.
- Ductwork condition
- Leaky, undersized, or damaged ductwork adds cost and undermines the efficiency of even a premium new unit.
- Electrical compatibility
- Older homes sometimes need panel or circuit upgrades to support a new system, especially higher-efficiency models.
Repair vs. replace
A unit under 10 years old with a single failed component is usually worth repairing. A unit over 10–12 years old, especially with a major component failure (compressor) or repeated breakdowns, is typically more cost-effective to replace.
DIY vs. professional
Refrigerant handling requires EPA certification, and most manufacturer warranties require licensed installation — this is a job for a licensed HVAC contractor, not a DIY project.
Ways to reduce costs
- Get a proper load calculation rather than assuming a like-for-like size
- Schedule installation in the off-season (fall or spring) rather than mid-summer
- Ask about utility and manufacturer rebates for high-efficiency systems
- Keep existing ductwork if a professional confirms it's in good condition
- Compare at least three quotes from licensed contractors
Questions to ask contractors
- Did you perform a Manual J load calculation, or are you sizing off the old unit?
- What SEER2 rating is this system, and what's the estimated annual operating cost?
- What does the warranty cover, and does it require online registration to activate?
- Is a permit required for this installation, and is it included?
- Are there current utility or manufacturer rebates I qualify for?
Project timeline
1. Load calculation and quote
1–3 days
2. Permitting (where required)
About 1 week
3. Installation
Typically 1 day
Maintenance considerations
Replace or clean filters monthly during cooling season, schedule an annual professional tune-up, and keep the outdoor coil clear of debris and vegetation.
Methodology & sources
These figures come from our published cost estimation methodology, cross-referenced against the sources below. They are estimates, not quotes — actual project costs vary by location, materials, labor, and contractor.
- U.S. Energy Information Administration — Residential Energy Consumption Survey
- U.S. Bureau of Labor Statistics — Occupational Employment and Wage Statistics
- U.S. Bureau of Labor Statistics — Producer Price Index, construction materials
Frequently asked questions
How long does AC replacement take?+
A standard installation with no ductwork or electrical changes typically takes one day. Ductwork modifications or electrical upgrades can extend the timeline.
Is a bigger AC unit always better?+
No — an oversized unit cools the space quickly but cycles on and off too often, which wastes energy and does a poor job of controlling humidity. Correct sizing from a load calculation matters more than maximum capacity.
What SEER2 rating should I choose?+
Higher SEER2 ratings cost more upfront but lower monthly operating costs. The payback period depends on your climate, electricity rates, and how long you plan to stay in the home.