How much does it cost to replace an AC unit?
Replacing a central air conditioning system typically costs $5,500–$12,000 installed for a standard home, with most falling around $8,000. Replacing the full system including the furnace or air handler, or upgrading ductwork, moves you toward and past the top of that range.
Where the money goes
Usually a full day or more
Only if needed
What changes the price
- System size in tons, driven by your home's square footage and insulation
- Efficiency rating — higher SEER2 costs more upfront and less to run
- Whether the furnace or air handler is replaced at the same time
- Condition and sizing of existing ductwork
- Access and installation complexity
- Regional labour rates and permit requirements
- Time of year — peak summer demand can raise prices
Repair or replace?
Replacement generally makes sense once a system is past 12–15 years, uses discontinued R-22 refrigerant, needs a compressor or coil, or has needed repeated repairs. Efficiency gains on a very old system can meaningfully reduce running costs, though savings depend on your climate and usage.
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Last reviewed August 8, 2026. These are typical US ranges for orientation, not quotes. Pricing varies significantly by region, home and contractor — always get written estimates before committing.