Why is my air conditioner not cooling my house?

An air conditioner that runs but doesn't cool typically points to one of seven causes: low refrigerant from a leak, frozen evaporator coil from restricted airflow, failed capacitor preventing the compressor from starting, dirty condenser coils restricting heat dissipation, clogged air filter reducing airflow, failing compressor, or thermostat malfunction. Each requires a different repair and proper diagnosis from a certified HVAC technician.

How much does AC repair cost?

AC repair costs in 2026 range from $89-$150 for a diagnostic service call, $150-$450 for capacitor or contactor replacement, $300-$1,500 for refrigerant leak repair and recharge, $450-$900 for blower motor replacement, $800-$2,500 for evaporator coil replacement, and $1,500-$3,500+ for compressor replacement. Accurate pricing requires on-site diagnosis — phone estimates without seeing the equipment are guesses.

Why won't my air conditioner turn on at all?

Before calling for service, confirm the thermostat is set to cool with setpoint below room temperature, check that the circuit breaker for the AC hasn't tripped, and verify the outdoor disconnect switch is in the on position. If those check out, common causes include a failed capacitor, tripped float switch from a clogged condensate drain, failed contactor, or control board issue. Repeatedly resetting a tripped breaker can damage compressor windings.

Why is my air conditioner freezing up or covered in ice?

Ice on an air conditioner means the system isn't getting enough heat to absorb, usually from restricted airflow or low refrigerant. Common causes include clogged air filter, closed or blocked supply vents, dirty evaporator coil, low refrigerant charge from a leak, or failed blower motor. Continuing to run a frozen AC damages the compressor. Turn it off, let it thaw 4-12 hours, and schedule service. If ice returns after thawing, refrigerant is almost certainly the cause.

What do different air conditioner noises mean?

Hissing or bubbling indicates a refrigerant leak. Grinding or screeching points to bearing failure in the blower motor or compressor. Banging or clanking suggests a loose or broken part. Buzzing without starting usually means a failed capacitor. Continuous clicking points to a failing contactor or control board. Loud outdoor rattling is often debris in the unit or a loose panel. Most AC component failures give audible warning signs before complete breakdown.

Can you repair a refrigerant leak in my air conditioner?

Yes. Eco Temp HVAC technicians are EPA Section 608-certified to handle all refrigerant work, which is a federal requirement. Refrigerant leak repair involves locating the leak with electronic detection or UV dye, repairing or replacing the affected component, and recharging the system. We charge refrigerant by the pound and only after confirming the leak is repaired. Older R-22 systems are typically not worth repairing once a refrigerant leak occurs since R-22 now costs $90-$150 per pound.

Can you repair my air conditioner the same day?

In most cases yes. Our service trucks stock the most common AC replacement parts including capacitors, contactors, sensors, thermostats, common motors, and refrigerant for both R-410A and R-454B systems. The majority of Chicago-area AC repairs are completed during the same visit. Repairs requiring special-order parts may require a second visit, usually within 24-72 hours.

Do you guarantee your AC repair work?

Yes. Eco Temp HVAC backs every AC repair with our Lifetime Repair Guarantee on the specific component repaired. If the same part fails again, we fix it at no additional labor cost within the lifetime of the system. Repairs performed by a licensed certified HVAC contractor do not void your manufacturer warranty. We document every repair and file warranty claims on your behalf for any parts still covered under manufacturer warranty.

AC Repair in Chicago, IL — Same-Day Service Available

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Fast, Reliable Air Conditioner Repair in Chicago and the Surrounding Suburbs

A failing AC during a Chicago heat wave isn’t something that can wait. Eco Temp HVAC provides same-day AC repair in Chicago, IL with NATE-certified technicians, transparent written estimates before any work begins, and 24/7 emergency response across Chicago and the surrounding suburbs including Lemont, Palatine, St. Charles, Downers Grove, Bartlett, Palos Heights, Hinsdale, Naperville, and Oak Park. Our service trucks stock the most common replacement parts — capacitors, contactors, sensors, motors, and refrigerant for both R-410A and R-454B systems — which means the majority of repairs are completed on the first visit. Call (224) 253-8131 for immediate dispatch.

Signs Your Air Conditioner Needs Repair

Catching AC problems early prevents minor repairs from turning into compressor or coil failures that can cost ten times more. Call us if your Chicago home is showing any of these symptoms:

AC runs but doesn’t cool — usually low refrigerant, frozen coil, failed capacitor, or compressor issue
AC blowing warm air — typically refrigerant, thermostat, or reversing valve issue
Outdoor unit won’t turn on — capacitor, contactor, or electrical issue
Ice buildup on the indoor coil or refrigerant line — restricted airflow or low refrigerant
Water leaking around the indoor air handler — clogged condensate drain or rusted drain pan
Loud noises — grinding, screeching, hissing, banging — each sound points to a different problem
Short cycling — turning on and off rapidly — damages the compressor over time
Burning smell or musty odor — electrical issue or mold in the system, both require immediate diagnosis
Sudden spike in your ComEd electric bill — an AC losing efficiency uses dramatically more power for the same cooling
Tripping the circuit breaker — short-cycling compressor, failing capacitor, or electrical fault

Common AC Repairs We Perform in Chicago

Over the years we’ve seen and fixed every type of AC failure in Chicago-area homes. The most common repairs:

Capacitor replacement — one of the most common AC failures and one of the quickest fixes; symptoms include the unit humming but not starting
Contactor replacement — electrical relay that controls power to the compressor; failure causes the system to stop responding entirely
Refrigerant leak diagnosis and repair — locating the leak with electronic detection or UV dye, repairing or replacing the affected component, and recharging to manufacturer specification (must be performed by an EPA 608–certified technician)
Thermostat replacement or recalibration — often the root cause of “my AC isn’t working right” calls
Condensate drain clearing — for indoor air handlers backing up water
Blower motor replacement — for ducted AC systems where airflow has dropped or stopped
Evaporator coil cleaning or replacement — for systems running but losing efficiency
Condenser fan motor replacement — for outdoor units where the fan stops spinning
Control board replacement — when the system’s electronic brain fails
Compressor replacement or repair — the most expensive repair; we’ll always provide a repair-vs-replacement analysis before recommending compressor work on systems over 10 years old

AC Repair Cost in Chicago, IL

AC repair costs in Chicago vary significantly based on what failed. Typical 2026 ranges:

Diagnostic service call: $89–$150 (credited toward repair if you proceed)
Capacitor or contactor replacement: $150–$450
Thermostat replacement: $150–$500
Condensate drain clearing: $150–$350
Refrigerant leak repair + recharge: $300–$1,500 depending on leak location and refrigerant type
Blower motor or condenser fan motor replacement: $450–$900
Control board replacement: $500–$1,100
Evaporator coil replacement: $800–$2,500
Compressor replacement: $1,500–$3,500+ (at which point we’ll discuss repair vs replacement)

We never quote a repair price over the phone before diagnosing the system — accurate pricing requires a technician on-site. Any company giving you a hard repair price without seeing the equipment is guessing. After diagnosis, you’ll receive a full written estimate before any work begins.

24/7 Emergency AC Repair in Chicago

AC failures don’t keep business hours, and Chicago summer heat waves are unforgiving — especially during heat advisories when indoor temperatures can become dangerous within hours. Eco Temp HVAC dispatches the next available technician for emergency calls 24/7, including weekends, holidays, and overnight. No-cooling emergencies during summer heat advisories are prioritized for fastest possible response.

We don’t charge premium emergency rates on evenings or weekends, and our dispatch line is staffed with real people — not voicemail. Visit our 24/7 emergency HVAC services page for full details, or call (224) 253-8131 any time.

AC Brands We Repair Across Chicago

Our NATE-certified technicians are trained and equipped to repair every major AC brand installed in Chicago-area homes including Trane, Carrier, Bryant, Lennox, American Standard, Mitsubishi Electric, Daikin, Amana, Rheem, Goodman, Ruud, Payne, York, Heil, and many others. Common replacement parts for all major brands are stocked on our service trucks, which is the main reason most Chicago AC repairs are completed during the same visit. For brand-specific buying advice if you’re considering replacement instead, see our New Air Conditioners page.

The Eco Temp HVAC AC Repair Process

Every Chicago AC repair we perform follows the same diagnostic-first process:

Service call dispatch. Our dispatch confirms your appointment window and gives you the technician’s name and photo via text.
10-15 minute arrival call. Your technician calls before arrival so you know exactly when to expect them.
System diagnosis. The technician inspects the system, runs diagnostic measurements (refrigerant pressures, electrical draw, temperature differential, airflow), and identifies the root cause of the issue.
Written estimate. Before any work begins, you receive a written repair estimate with itemized parts and labor. No work happens without your approval.
Repair performed. Most repairs are completed during the same visit using parts stocked on the truck. Special-order parts may require a second visit, usually within 24-72 hours.
System verification. Before leaving, the technician confirms the system is cooling properly, the repair is holding, and all measurements are within manufacturer specification.
Repair documentation. You receive written documentation of the repair for your records and for any manufacturer warranty claims.

Repair vs. Replace: When It’s Time to Upgrade

Some AC failures aren’t worth repairing on older systems. As a general rule, if your AC is over 10-12 years old and a single repair exceeds $1,500, replacement is often the more cost-effective long-term decision — both because modern systems are 25-40% more efficient and because additional component failures become increasingly likely as a system ages past its rated life.

We’ll always present both options honestly during the diagnostic visit, including a side-by-side cost analysis. If replacement makes more sense for your situation, see our AC Installation in Chicago page for the installation process and what to expect, or our New Air Conditioners page for system options, pricing tiers, and available rebates.

Lifetime Repair Guarantee

Eco Temp HVAC backs every AC repair with our Lifetime Repair Guarantee on the specific component repaired. If the same part fails again, we fix it at no additional labor cost within the lifetime of the system. This is significantly better than the 30-90 day warranty most HVAC companies offer on repair work, and reflects our confidence in both our diagnostic accuracy and our installation quality.

Repairs performed by a licensed certified HVAC contractor like Eco Temp HVAC do not void your manufacturer warranty. Most AC manufacturer warranties explicitly require professional service for coverage to remain valid. We document every repair and file warranty claims on your behalf for any parts still covered under manufacturer warranty, which can significantly reduce your out-of-pocket cost on covered components.

Eco Temp HVAC vans outside of a high school while the technicians are inside repairing their AC units.

Why Chicago Homeowners Trust Eco Temp HVAC for AC Repair

NATE-certified, EPA 608–licensed technicians. Every technician handling refrigerant is federally certified. Many companies use unlicensed labor — we don’t.
Diagnostic-first approach. We diagnose before we quote, quote before we work, and provide written estimates with no surprise charges.
Most common parts in stock on every truck. Capacitors, contactors, sensors, motors, thermostats — most Chicago AC repairs are completed on the first visit.
24/7 emergency dispatch. Real people answer the phone, day or night, weekends, holidays included.
No premium pricing for nights, weekends, or holidays. Emergency repair costs the same as a scheduled visit.
Lifetime Repair Guarantee on the components we repair.
BBB A+ rated with verified customer reviews across Chicago and the surrounding suburbs.
Licensed, bonded, and insured — Illinois License TGC119983

AC Maintenance Plans Prevent Most Future Repairs

Most AC failures we see in Chicago are preventable with basic maintenance. Our HVAC maintenance plans include two annual visits (spring AC tune-up, fall furnace check), priority scheduling for repair calls, and discounted repair rates. The single best way to extend system life and avoid emergency repair costs.

Need a New AC Instead?

If your AC is beyond cost-effective repair, we also handle full system replacement. Visit our AC Installation in Chicago page for the installation process, our New Air Conditioners page for equipment options and pricing, or our AC Replacement page for upgrade-specific guidance.

AC Repair Service Areas Across Chicagoland

We provide same-day AC repair across Chicago and the entire Chicagoland region including: Chicago, Lemont, Palatine, St. Charles, Downers Grove, Bartlett, Kirkland, Palos Heights, Hinsdale, Naperville, Oak Park, Orland Park, Arlington Heights, Schaumburg, Elmhurst, Wheaton, Aurora, Elgin, and the broader Chicagoland area.

Schedule Your AC Repair Service Today

Don’t let a malfunctioning AC disrupt your comfort during a Chicago heat wave. Call Eco Temp HVAC at (224) 253-8131 or request service online. For after-hours emergencies, call the same number any time — our 24/7 dispatch will get a technician en route.

Frequently Asked Questions About AC Repair

Common questions about air conditioner repair costs, diagnostic symptoms, emergency service, refrigerant leaks, and same-day repair across the Chicago area.

An air conditioner that runs but doesn't cool typically points to one of seven causes:

Low refrigerant from a leak — refrigerant levels don't naturally drop, so low charge always means a leak somewhere in the system
Frozen evaporator coil from restricted airflow or low refrigerant — ice on indoor coil blocks heat transfer
Failed capacitor — outdoor unit hums but compressor doesn't start
Dirty condenser coils on the outdoor unit, restricting heat dissipation
Clogged air filter reducing airflow across the indoor coil
Failing compressor — runs but doesn't compress refrigerant properly
Thermostat malfunction calling for cool but signaling the unit incorrectly

Each requires a different repair. Call (224) 253-8131 for same-day diagnostic service across Chicago and the surrounding suburbs.

AC repair costs in 2026 vary significantly based on what failed:

Diagnostic service call: $89–$150 (credited toward repair if you proceed)
Capacitor or contactor replacement: $150–$450
Refrigerant leak repair + recharge: $300–$1,500 depending on leak location and refrigerant type
Thermostat replacement: $150–$500
Condensate drain clearing: $150–$350
Blower motor replacement: $450–$900
Evaporator coil replacement: $800–$2,500
Compressor replacement: $1,500–$3,500+ (at which point we'll discuss repair vs replacement)

Before calling for service, check three things first: confirm the thermostat is set to "cool" and the setpoint is below room temperature, check that the circuit breaker for the AC hasn't tripped at the electrical panel, and verify the disconnect switch outside near the condenser unit is in the "on" position.

If those check out and the system still won't start, common causes are a failed capacitor, a tripped float switch on the indoor air handler (often from a clogged condensate drain), a failed contactor, or a control board issue. Schedule diagnostic service rather than continuing to flip breakers — repeatedly resetting a tripped breaker can damage compressor windings.

Ice forming on an air conditioner — either on the indoor evaporator coil or on the outdoor refrigerant line — means the system isn't getting enough heat to absorb, usually because of restricted airflow or low refrigerant. The most common causes:

Clogged air filter — change the filter immediately and turn the system off for several hours to let ice melt
Closed or blocked supply vents reducing airflow across the evaporator coil
Dirty evaporator coil after years without maintenance
Low refrigerant charge from a leak — most common cause if the filter is clean
Failed blower motor or capacitor reducing fan speed

Continuing to run a frozen AC damages the compressor. Turn it off, let it thaw completely (4-12 hours), and schedule diagnostic service. If ice returns after thawing, refrigerant is almost certainly the cause and you'll need professional repair.

Indoor water leaks from an air conditioner typically come from one of four causes: a clogged condensate drain line (most common), a frozen evaporator coil that has thawed, a rusted or damaged condensate drain pan, or a disconnected drain line. Most clogged drains can be cleared in 30-60 minutes during a service call.

Water from an AC isn't just a nuisance — left untreated it can cause significant damage to drywall, flooring, and basement finishes. If you see water around your indoor air handler, turn the system off and schedule same-day service. Our trucks carry the equipment needed to clear most condensate drains on the first visit.

Different AC noises point to specific problems:

Hissing or bubbling: Refrigerant leak — schedule service before refrigerant is fully depleted
Grinding or screeching: Bearing failure in blower motor or compressor — turn off immediately
Banging or clanking: Loose or broken part inside the compressor or blower
Buzzing or humming without starting: Failed capacitor preventing the compressor from starting
Clicking that doesn't stop: Failing contactor or control board issue
Loud rattling outdoors: Often debris in the outdoor unit or a loose panel

Any new or unusual AC sound is worth a diagnostic call before it becomes a major failure. Most AC component failures give audible warning signs in the days or weeks before complete breakdown.

Yes. Eco Temp HVAC technicians are EPA Section 608-certified to handle all refrigerant work, which is a federal requirement. Refrigerant leak repair involves three steps: locating the leak with electronic detection or UV dye, repairing or replacing the affected component (line, coil, valve, or fitting), and recharging the system to manufacturer specification.

We charge refrigerant by the pound and only after confirming the leak is repaired — so you're never paying to recharge a system that will just leak out again. Older systems using phased-out R-22 are typically not worth repairing once a refrigerant leak occurs, since R-22 now costs $90-$150 per pound. We provide written repair vs replacement analysis in these cases.

Yes. Eco Temp HVAC provides 24/7 emergency AC repair across Chicago and the surrounding suburbs including weekends, holidays, and overnight hours. No-cooling emergencies during heat advisories and Chicago summer heat waves are prioritized for fastest possible response.

We don't charge premium emergency rates on evenings or weekends, and our dispatch line is staffed with real people — not voicemail. Call (224) 253-8131 any time for immediate dispatch.

In most cases yes. Our service trucks stock the most common AC replacement parts — capacitors, contactors, sensors, thermostats, common motors, and refrigerant for both R-410A and R-454B systems. Combined with our diagnostic-first approach, the majority of Chicago-area AC repairs are completed during the same visit.

Repairs requiring special-order parts (specific OEM components, certain compressors, evaporator coils for older systems) may require a second visit, usually within 24-72 hours. We provide a clear timeline at the diagnostic visit so you know what to expect.

Yes. Eco Temp HVAC backs every AC repair with our Lifetime Repair Guarantee on the specific component repaired. If the same part fails again, we fix it at no additional labor cost — within the lifetime of the system. This is significantly better than the 30-90 day warranty most HVAC companies offer on repair work.

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Proudly Serving Chicago and surrounding suburbs

Eco Temp HVAC is a beacon of excellence for furnace repair and comprehensive HVAC services with office locations in Chicago, Lemont, Palatine, Kirkland, St Charles, Downers Grove, Bartlett, and the Northwest Suburbs. Our seasoned technicians are adept at servicing various heating systems, encompassing furnaces, boilers, heat pumps, and beyond. Beyond just repairs, we’re proud to offer installation, maintenance, and replacement services, guaranteeing your HVAC systems deliver peak year-round performance. Our unwavering dedication to superior quality and unparalleled customer care solidifies our status as a trusted HVAC service pillar in the community.