How much does it cost to replace an AC compressor?
Replacing an AC compressor costs $1,800 to $2,800 installed according to HomeGuide, though Angi and This Old House both publish $800 to $2,300.
That gap is real and it is not a rounding difference. HomeGuide's own table gives a national average of $2,300, a minimum of $1,000 and a maximum of $5,200. This Old House puts the average at $1,550. Angi says most people pay $1,200. Three guides, one part, a thousand dollars between them — so treat any single figure as the start of your shopping, not the end of it.
Sources: HomeGuide, This Old House, Angi
This page is general information, not professional advice. Prices move with your equipment, your region and the season, and the only number that counts is a written quote from a licensed HVAC contractor who has looked at your system.
AC compressor replacement cost by system size
Bigger system, bigger compressor, more hours on the clock. Only one of the three guides publishes a table for it, so this is HomeGuide's, verbatim.
| System size | Compressor replacement, installed |
|---|---|
| 1.5 tons | $1,500 – $2,000 |
| 2 – 2.5 tons | $1,800 – $2,200 |
| 3 – 3.5 tons | $2,000 – $2,600 |
| 4 – 4.5 tons | $2,200 – $2,800 |
| 5 tons and up | $2,500 – $3,500 or more |
Source: HomeGuide
The tool version of this table, with the repair-or-replace arithmetic run against your own quote: the HVAC replacement cost calculator.
Cost to replace a compressor in an AC unit: what you are paying for
Mostly hours. HomeGuide says most compressor replacements take 4 to 8 hours of work by a certified technician, and that accessing the compressor in tight spaces, running new refrigerant lines or updating electrical connections adds to that. This Old House prices the labor separately at $75 to $150 an hour, or a flat fee of $300 to $900.
Sources: HomeGuide, This Old House
The refrigerant matters more than people expect. HomeGuide says replacing the compressor in an older system that runs on R-22 can cost more than $5,000, because R-22 is no longer produced in the United States and has become expensive and hard to get.
Source: HomeGuide
Central air compressor cost versus the whole unit
This is the question underneath the question. A compressor is the single most expensive thing on an air conditioner, and once you are spending that much there is a real argument for spending a bit more and getting a new system with a new warranty.
HomeGuide gives four conditions for replacing the whole unit instead: the compressor is no longer under warranty, the unit is more than 10 years old, it has a history of other problems, or the repair costs 50% or more of the price of a new AC. It also says that if the unit is still under warranty, most technicians recommend replacing just the compressor.
Source: HomeGuide
Ask what the warranty says before you agree to anything. It is the one phone call that can change the answer completely.
HomeGuide says most compressors carry a manufacturer warranty of 5 to 12 years and that a failure inside that window may leave you paying labor only. It also prices an AC inspection at $150 to $500 and points out that compressor failure symptoms often mimic other, cheaper problems.
Source: HomeGuide
How long an AC compressor lasts
HomeGuide puts it at 10 to 15 years on average, and 8 to 10 in the southern United States where the equipment runs harder for longer. That is the number to weigh against a repair quote: a compressor at year 12 in Phoenix is a different decision from the same compressor at year 4 in Seattle.
Source: HomeGuide
Can a compressor be repaired instead of replaced?
Not the compressor itself. HomeGuide says AC compressors are hermetically sealed and cannot be repaired or rebuilt on site, which leaves three options: replace the compressor, replace the outdoor condenser unit, or replace the whole system. Electrical faults and leaks in the connecting lines around it are a different story and can often be fixed.
Source: HomeGuide
What to ask before you sign
- Is the compressor under warranty, and does the warranty cover the labor as well as the part?
- What refrigerant does this system use? An R-22 answer changes the arithmetic.
- Was anything else tested, or did the diagnosis stop at the compressor?
- What does a new system of the same size cost installed, from you, this week?
- Is the diagnostic fee credited against the repair if I go ahead?
Three written quotes on the same job is the advice every one of these guides gives. These are the HVAC companies AI assistants actually name when homeowners ask. Nobody can pay to be on these lists.
- Most recommended HVAC companies in Tampa, FL
- Most recommended HVAC companies in Houston, TX
- Most recommended HVAC companies in Phoenix, AZ
- Most recommended HVAC companies in Atlanta, GA
- Most recommended HVAC companies in Dallas, TX
- Most recommended HVAC companies in Orlando, FL
Not your city? See every metro we measure.
Questions people ask next
- How much does an AC compressor cost by itself?
- This Old House prices the unit alone by type: rotary at $50 to $100, reciprocating at $400 to $1,000, scroll at $500 to $1,500 and centrifugal at $1,600 to $2,400. The rest of any quote is labor, refrigerant and the diagnostic.
- Is it worth replacing the compressor on an AC unit?
- HomeGuide says it makes financial sense when the unit is relatively new — under 8 years old — and still under warranty. For older units or ones with recurring problems it says full system replacement may provide better long-term value.
- Why is my quote higher than these ranges?
- Season, access and refrigerant, mostly. HomeGuide notes that AC repairs peak in summer and that some companies charge less in late fall and early spring, and that R-22 systems can push a compressor replacement past $5,000.
- Can I replace just the outdoor unit?
- Sometimes. HomeGuide says it is possible if the indoor components are compatible and in good condition, but that a system running R-22 or R-410A cannot have only its outdoor unit replaced because of the refrigerant changes.
Written for homeowners by Most Recommended HVAC, which measures which HVAC companies AI assistants actually recommend in 26 U.S. metros. Nobody can pay to be on those lists. How we measure.