AC Contactor Replacement Cost
Typical market range as of May 2026 · regionalized for northern Illinois
Most homeowners
$250
The contactor is the electrical switch that powers your outdoor unit when the thermostat calls for cooling. Pitted or burned contacts are a common reason the condenser won't start or hums without engaging. The part is only $20–$100, so a fair all-in replacement is typically $150–$400 — again, the diagnosis and labor, not the part, drive the bill.
Pricing this job, not hiring for it? See what the work is worth →The part itself
$20–$100
The rest of your bill is diagnosis, the trip, and skilled labor — not the part.
What drives the price
Single vs. double pole
Single-pole contactors (smaller systems) are cheaper; heavy-duty double-pole units for larger ACs and heat pumps cost more.
Bundled with diagnosis
If diagnostic is billed separately, the contactor swap itself is often just $100–$200 of labor.
Related wear
A burned contactor sometimes comes with a tired capacitor; techs often check both on the same visit.
Season
Peak summer and after-hours calls run higher than a scheduled weekday repair.
In our market — McHenry County & northern Illinois
In the McHenry County market, a contactor replacement typically runs $160–$300 on a weekday. Insects and debris love to get into outdoor contactors over a Midwest off-season — a contactor that 'welded' shut over winter is a common first-warm-day call.
Walk in informed
A contactor is a small, inexpensive part. If a stuck contactor becomes a sales pitch for a whole new condenser on an otherwise healthy unit, get a second opinion.
Fair Price Guide is iHVAC's market research for informational purposes and is strictly advisory. Actual prices are set by the independent technician. iHVAC is not a party to any transaction and assumes no liability, operating with zero middleman billing or liability.
Not sure this is your problem yet?
Talk to Dale — iHVAC's free AI diagnostic. He'll narrow down what's actually wrong before you call anyone, so you know exactly which job you're looking at. No signup, no catch.
For the tech
What this work is actually worth
Undercharging is the chronic problem for independent and side-job techs — you quote the part plus a little, forget what it really costs to show up, and train customers to expect cheap. The ranges above aren't a ceiling. Here's how to think about pricing this job so you're not working for free.
Why it's worth it
Same as the capacitor: a small part, but the customer pays for correct diagnosis, the right contactor rating, and a unit that starts reliably afterward. That's a service call.
Don't undercut yourself
Throwing a contactor in 'for free while I'm here' teaches the customer the part is the whole job. Your time on site is the cost — price it.
Build these into every price — not just the part:
Drive + windshield time. The hour each way isn't free. If you're not billing for getting there, you're working below your hourly.
Truck, tools, fuel. Your van, gauges, recovery machine — what they cost to own and run is overhead on every single call.
License, insurance, bond. Carrying real coverage is what separates you from the unlicensed guy. It has to be priced in, not eaten.
Callback & warranty risk. Some jobs come back. A price with zero margin for a return trip loses money on the ones that do.
Taxes & self-employment. As a 1099 independent you owe self-employment tax and your own withholding. The number you charge isn't the number you keep.
Your expertise isn't free. Knowing exactly what's wrong in five minutes is the product. An unskilled-labor rate undersells the one thing customers can't get elsewhere.
Help build the real number
The most accurate guide isn't built from national averages — it's built from what techs in your area actually charged. Contribute what you charged for this job and it feeds the local range here. It's opt-in, fully anonymized, and only ever shown as an aggregate once enough techs have contributed — never your individual price, never a price iHVAC sets, never a floor anyone has to hold. Just real market information, so the whole trade prices its work fairly.
Contribute what you chargedCommon questions
What does an AC contactor actually do?
It's the relay that closes to send power to the compressor and condenser fan when your thermostat calls for cooling. When its contacts pit or burn, the outdoor unit may not start, may hum, or may not shut off.
Is a bad contactor an emergency?
It means no cooling, so in a heat wave it feels like one — but it's a quick, cheap fix once a tech is on site. It is not a sign your system is failing.
Contactor or capacitor — how do I know?
Both can stop the outdoor unit from starting and they're often checked together. A tech with a meter confirms which (or both) in minutes.
Related costs
How we research these numbers
This range is synthesized from published 2025–2026 US HVAC cost data and HVAC field knowledge, then regionalized toward northern Illinois. It's market reference — not a quote, and not a price iHVAC sets. As real techs complete jobs on iHVAC, these ranges will be backed by the actual local prices homeowners pay — the most accurate source there is.
References triangulated for this guide: