Most AC repairs cost $130–$600. The majority of residential failures trace to a short list of components, and most of those components are cheap. The wide price range you’ll see quoted for “AC repair” exists because a capacitor and a control board are both “AC repair”; they’re just not the same job.
Before you approve a repair
- 1What exactly failed, and what reading or test confirmed it? (“It was weak” isn’t a diagnosis — a number is.)
- 2What’s the exact replacement part — spec or rating — and does it match my system’s data plate?
- 3Is the diagnostic or service-call fee separate, and is it waived if I approve the repair?
- 4What’s the warranty on the part and the labor, in writing?
- 5If this fails again within a year, what does that tell us?
- 6Given my system’s age, does a repair still make sense here, or should I get a replacement bid too?
Before you spend on the repair itself: airflow problems from a clogged or wrong-MERV filter mimic real component failures, and it’s the one check that costs nothing.
Full filter sizing & MERV guide → · Free rating/size/cost tool →
Here’s the full price table by component, then the diagnostic order that finds the cheap fix first.
AC repair cost by component
| Component | Typical installed price |
|---|---|
| Run capacitor | $130–$400 |
| Start capacitor / hard-start kit | $180–$450 |
| Contactor | $150–$400 |
| Capacitor + contactor (common combo) | $250–$600 |
| Condenser fan motor | $400–$800 |
| Blower motor (PSC, single-speed) | $400–$900 |
| Blower motor (ECM, variable-speed) | $600–$1,500 |
| Refrigerant recharge (top-off, minor leak) | $200–$600 |
| Refrigerant leak repair + recharge | $400–$1,500+ |
| Control/circuit board | $500–$1,500 |
| Service call / diagnostic only | $75–$150 |
The service-call fee covers the tech’s time to diagnose the problem. Most companies waive it when you approve the repair; confirm that on the phone before you book.
📊 Deciding whether to repair or replace?
The cost data in this guide comes from real, itemized HVAC contractor bids analyzed with BidSmart, a bid-comparison tool from our team. Upload the quotes you’ve received and see how they compare line-by-line — scope, equipment tiers, and the items a low bid quietly leaves out — before you sign anything.
Diagnostic order: cheapest first
Roughly 60-70% of residential AC failures are electrical, and most of those are capacitors or contactors. Both are inexpensive parts with a 15-30 minute swap time. This is the right order to work through the problem:
1. Check the obvious (no-cost, no-tech): Is the thermostat set to COOL and below room temperature? Is the furnace filter clogged enough to block airflow entirely? Is the condensate drain line overflowing and tripping the float switch? These cause AC shutdowns and cost $0 to fix.
2. Capacitor ($130–$400): If the outdoor unit hums but the fan won’t spin, or the compressor won’t kick on, a failed capacitor is the first suspect. It’s also the most inflated line item in the industry; quotes of $500+ for a single-capacitor swap are common and not justified. See AC capacitor replacement cost for what a fair invoice looks like.
3. Contactor ($150–$400): If the unit won’t start at all when the thermostat calls for cooling — no hum, no response — the contactor (the relay that closes when your thermostat signals the unit) is worth checking, and is often replaced alongside the capacitor when both are showing age.
4. Fan motor ($400–$800): If the fan runs but slowly, or runs intermittently, and the capacitor tests good, the condenser fan motor itself may be failing. This repair is straightforward but takes longer and costs more because the motor is a larger, mounted assembly.
5. Refrigerant issues ($200–$1,500+): If the unit runs, the fan spins, but the air isn’t getting cold, low refrigerant is a common culprit. A refrigerant “top-off” only makes sense if the leak is found and repaired first; adding refrigerant to a leaking system is wasted money. By law, only EPA 608-certified technicians can purchase and handle refrigerants.
6. Control board ($500–$1,500): If the unit has power but no response to any signal, or if it’s throwing error codes you can’t clear, the control board may be faulty. This is the repair that argues most strongly for comparing its cost against the age of the system before approving it.
When repair stops making sense
The standard benchmark: multiply the repair cost by the unit’s age in years. If the result exceeds $5,000, get replacement bids before you approve the repair.
Examples:
- $400 capacitor on a 10-year-old unit: $4,000 effective cost. Repair.
- $800 fan motor on a 14-year-old unit: $11,200. Get bids.
- $1,200 board on a 13-year-old unit: $15,600. Replace.
A unit approaching or past 15 years is past the average residential AC lifespan. Even if today’s repair is modest, you’re investing in aging equipment while newer systems carry a 10-year parts warranty and meaningfully better efficiency. See how long HVAC equipment lasts for the full lifespan table.
Red flags on a repair quote
- A blended price with no part specified. You’re entitled to know what component is failing, its exact spec (part number or description), and its cost as a separate line from labor.
- “Your system is too old to repair.” Technically true for a 25-year-old unit; a sales pitch for a 10-year-old one with a failed capacitor. Get a second opinion before approving replacement on a unit that still has useful life.
- No refrigerant leak search before a top-off. Adding refrigerant without finding the leak costs you twice: the refill now, and another refill in 12 months. A proper leak repair includes leak detection, sealing, and a verified pressure test.
- After-hours emergency pricing on a non-emergency call. Emergency rates ($75–$200 premium) are legitimate for nights and weekends. Booking a same-week appointment doesn’t qualify.
Before you sign: three questions
- “What component failed, and what did it measure?” Good answer is specific: “The capacitor read 28 µF on a 45 µF can.” Bad answer: “It was weak.”
- “Is the refrigerant leak located and repaired, or just topped off?” For any refrigerant-related repair, insist on leak detection, not just recharge.
- “What’s the warranty on this repair: part and labor?” One year on both is standard. If they hesitate on labor warranty, that tells you something.
For the full checklist of questions to ask before approving any HVAC work, see The HVAC Quote Checklist. For a broader view of what system replacement would cost if repair no longer makes sense, see the full HVAC cost index.
Refrigerant recharges are priced differently from other repairs, and R-22 is an outlier.
