TL;DR: Most AC repairs fall between $150 and $900, depending on the part. A diagnostic call runs $75-$150. Capacitors and contactors are the cheapest common fixes ($150-$350 installed). Fan motors cost $300-$600. Evaporator or condenser coils run $600-$1,500. A compressor replacement can hit $1,200-$2,500, at which point a new system often makes more financial sense. The repair-vs-replace tipping point is roughly when the repair cost exceeds 50% of what a new unit would cost, especially on a system older than 10 years.
If your AC stopped cooling and you’re trying to figure out whether to fix it or replace it before calling anyone, this breakdown will get you oriented. The cost range for AC repair is wide, because “AC repair” covers everything from a $12 capacitor to a compressor that costs more than a used car. Knowing which part is likely failing, and what that part costs installed, helps you evaluate the quote you get and decide whether repair or replacement is the smarter move.
What does an AC diagnostic call cost?
Most HVAC companies charge $75 to $150 for a diagnostic service call. That fee covers the technician’s time to inspect the system, run electrical checks, measure refrigerant pressures, and identify the fault. Some companies apply the diagnostic fee toward the repair if you proceed; others treat it as a flat trip charge either way. Ask before you book.
A good diagnostic should tell you exactly which component failed, whether refrigerant is low (and why), and what the repair will cost before any work starts. If a technician quotes you a repair without explaining what failed and showing you the diagnostic readings, ask for the specifics. A written quote with the part number, labor rate, and warranty terms is standard practice.
One thing to check: if your system is just running but not cooling, the problem is sometimes simpler than a failed part. A clogged air filter, a tripped breaker on the outdoor disconnect, or a frozen evaporator coil from restricted airflow can all mimic a mechanical failure. The post Air Conditioner Not Cooling: 9 Reasons Your AC Runs But the House Stays Hot walks through those before you call.
What do common AC repairs cost by part?
Here are realistic installed costs (part plus labor) for the repairs that come up most often on central AC systems.
Capacitor replacement: $150-$350 The capacitor is a small cylindrical component that gives the compressor and fan motors the jolt they need to start. It fails more often than any other AC part, especially in climates where the system runs hard through a long cooling season. Symptoms: the outdoor unit hums but the fan doesn’t spin, or the system trips breakers repeatedly. The part itself costs $15-$40; the rest is labor and the service call. This is the best-case repair scenario.
Contactor replacement: $150-$300 The contactor is an electrical relay that switches power to the compressor and condenser fan when the thermostat calls for cooling. Contactors wear out from repeated switching and can get pitted or stuck. Symptoms: the system doesn’t respond to the thermostat, or it runs continuously. Replacement is straightforward and usually done at the same visit as a capacitor if both show wear.
Condenser fan motor replacement: $300-$600 The fan motor on the outdoor unit moves air across the condenser coil to reject heat. When it fails, the system may run but not cool, or shut off on high-pressure lockout. Motor cost varies by tonnage and brand; labor adds 1-2 hours. This is a mid-range repair that’s usually worth doing on a system under 10 years old.
Refrigerant recharge: $200-$600 Refrigerant doesn’t “use up” like fuel. If your system is low, there’s a leak somewhere. A recharge without finding and fixing the leak is a temporary fix. The cost depends on how much refrigerant is needed and which type your system uses. Systems manufactured before 2010 likely use R-22 (Freon), which has been phased out under EPA regulations and now costs significantly more per pound than the R-410A or R-454B refrigerants used in newer equipment. An R-22 recharge alone can run $400-$900 depending on how low the system is, which changes the repair-vs-replace math considerably.
Evaporator coil replacement: $600-$1,500 The evaporator coil sits inside the air handler and is where refrigerant absorbs heat from your home’s air. Coils fail from corrosion (formicary corrosion from certain household chemicals is common) or from a refrigerant leak that wasn’t caught early. Replacement requires recovering and recharging refrigerant, which adds to the cost. This is a significant repair; on older systems, it often triggers the replacement conversation.
Condenser coil replacement: $700-$1,500 The outdoor coil can be damaged by hail, debris, or corrosion. Replacement is labor-intensive and sometimes costs nearly as much as a new outdoor unit, especially on older systems where the coil is no longer stocked and has to be sourced as a special order.
Compressor replacement: $1,200-$2,500 The compressor is the heart of the refrigerant circuit. When it fails, the system produces no cooling at all. Compressor replacement is the most expensive single AC repair, and it almost always prompts a serious replacement discussion. On a system over 10 years old, most technicians will recommend a new system rather than a compressor swap, because the remaining components have similar age and wear.
Thermostat or control board: $200-$600 Control boards and smart thermostats fall in the mid-range. A faulty control board can cause erratic behavior (short-cycling, failure to start, incorrect staging). Thermostat replacement is on the lower end; a control board on a communicating system can push toward the higher end.
How do you decide whether to repair or replace?
The standard industry rule of thumb is the “50% rule”: if the repair cost exceeds 50% of what a new comparable system would cost, replacement is usually the better financial decision. For context on what a new system costs, see our breakdown at How Much Does a New AC Unit Cost? A Realistic Budget Breakdown.
But the 50% rule is a starting point, not the whole answer. Here are the other factors that shift the math:
System age. Central AC systems typically last 12-17 years with regular maintenance. A 15-year-old system that needs a $900 coil repair is a different situation than a 6-year-old system with the same repair. The older system is likely to need another major repair within 2-3 years; the younger one probably has a decade of service left.
Refrigerant type. If your system uses R-22, replacement is almost always the right call for anything beyond a minor repair. R-22 production ended in 2020 under the EPA’s phaseout program, and remaining supplies are expensive. A new system uses current refrigerants and is eligible for efficiency rebates.
Efficiency rating. Older systems often run at 10-12 SEER. Current minimum efficiency in most of the country is 14 SEER2 (higher in southern climate zones). A new ENERGY STAR-certified system at 16-18 SEER2 can meaningfully reduce your cooling bill, which offsets some of the replacement cost over time.
Repair history. If this is the second or third significant repair in three years, the system is telling you something. A pattern of failures usually means the system is at end of life across multiple components, not just the one that failed today.
Warranty status. If the system is still under a manufacturer’s parts warranty (typically 5-10 years on major components), a covered repair changes the math significantly. Confirm warranty status with the model and serial number before agreeing to an out-of-pocket repair.
A straightforward way to frame it: multiply the repair cost by the system’s age. If that number exceeds $5,000, replacement is generally the better value. Example: a $600 repair on a 10-year-old system gives you $6,000, which suggests replacement deserves a serious look. A $600 repair on a 4-year-old system gives you $2,400, which clearly favors repair.
What should you do before approving a repair?
Get the diagnosis in writing before you authorize anything. A written quote should include the specific part being replaced (with model or part number if possible), the labor charge, the refrigerant charge if applicable, and the warranty on parts and labor. Most reputable HVAC companies warranty their repair labor for at least 30-90 days and pass through the manufacturer’s parts warranty.
For any repair over $500, it’s reasonable to ask whether the technician recommends repair or replacement given the system’s age and condition. A good technician will give you a straight answer. If the recommendation is replacement, ask what size and efficiency level they’d recommend and whether they can provide a quote for both options so you can compare.
If the system is under 8 years old and the repair is under $400, approve it and move on. If the system is over 12 years old and the repair is over $800, get a replacement quote before deciding. Everything in between deserves a conversation.
All Pro Plumbing Heating and Air handles AC repair and AC installation across the region, and can give you a written quote for both options when the repair-vs-replace decision isn’t clear. For systems where a heat pump might be the right replacement path, heat pump services are also available. Call (661) 863-9242 to schedule a diagnostic.
About All Pro Plumbing Heating and Air
All Pro Plumbing Heating and Air is a licensed plumbing and HVAC contractor serving Bakersfield, CA and surrounding communities (license 960566). Available 24/7, their technicians handle air conditioning repair and installation, heating, plumbing, and gas line work across Kern County. They serve Bakersfield, Oildale, Rosedale, Shafter, Delano, Taft, Tehachapi, and the surrounding region.