Estimated Read Time: 10 minutes
AC running but not cooling your home is frustrating, especially during a Champaign County heat wave. Here’s how to pinpoint what’s wrong, what you can fix yourself, and when to call Lanz for fast, flat-rate AC repair. We perform 24/7 emergency repairs on all types of air conditioners, from aging models to the most advanced systems on the market. Membership perks can speed service and lower repair costs.
Start With These Fast Checks
Before you worry about a major issue, confirm the basics. Many no-cooling calls in summer trace to easy fixes you can do in minutes.
- Thermostat settings
- Set to Cool, not Heat or Fan Only.
- Lower the setpoint at least 3 degrees below room temperature.
- Replace batteries if the screen is dim or unresponsive.
- Air filter
- If it looks gray or caked with dust, replace it. A clogged filter chokes airflow and kills cooling.
- Supply and return vents
- Open every vent in the home. Move rugs and furniture off grilles.
- Outdoor unit
- Make sure the fan is spinning and the top is blowing warm air out. Clear away grass clippings and cottonwood fluff.
"On time. Technician was great. Diagnosed problem quickly and had the parts needed to repair our airconditioner and get us back to cool quickly."
Airflow: The Silent Cooling Killer
Restricted airflow is the number one reason an AC runs but will not drop the temperature. Your system needs a steady volume of air over the evaporator coil. Starve it and you get poor cooling, long run times, and even a frozen coil.
Common airflow blockers:
- Dirty air filter
- Closed or blocked vents
- Crushed or disconnected ducts
- Dirt-matted evaporator coil
- Weak blower motor or failing capacitor
What you can do today:
- Replace the filter and open all vents.
- Check visible duct runs in basements or attics for kinks or disconnections.
- If you see ice on the indoor coil or refrigerant lines, shut the system off at the thermostat and run the fan only for 2 to 4 hours to thaw. Then call us.
How we fix it:
- Measure static pressure and airflow to confirm restrictions.
- Clean the evaporator coil and blower assembly as needed.
- Test the blower motor, capacitor, and control board for proper operation.
"I will give 5 stars to my tech. He solved my AC problem in 30 or 40 minutes. The price is reasonable... their service is excellent... Five star company, five star tech!"
Refrigerant Problems and Frozen Coils
Low refrigerant or a leak reduces the system’s ability to absorb heat indoors. You might notice lukewarm supply air, longer cycles, and ice on lines or the indoor coil.
Warning signs:
- Hissing at the indoor unit
- Ice buildup on the copper lines or coil
- AC runs nonstop but rooms stay warm
What you can do:
- Turn the AC off if you spot ice. Thawing prevents damage.
What we do:
- Perform leak testing and verify superheat/subcool readings.
- Repair leaks when possible and recharge per manufacturer specs.
- If the system uses an older refrigerant and leaks are extensive, we may recommend replacement to save future costs and meet current efficiency standards.
Note: The cost to repair an air conditioner typically ranges from $100 to $600. Major component replacements, like a compressor, can cost $1,000 or more. We provide flat-rate pricing before work begins.
"Our AC wasn’t working like it was supposed to... Lanz got a guy here within the hour and got our AC fixed! It ended up being that capacitor had pooped out... the service was fairly priced."
Outdoor Unit Can’t Dump Heat
Your condenser must reject indoor heat to the outside. If it is coated in debris or choked by overgrown plants, your AC will run without real cooling.
Homeowner steps:
- Gently hose off the condenser fins from the outside in. Do not bend fins.
- Maintain at least 2 feet of clearance on all sides and 5 feet above the unit.
- After severe Midwest storms, check for leaves and sticks lodged in the top fan guard.
Technician steps:
- Deep-clean condenser coils and straighten fins.
- Test the outdoor fan motor, contactor, and capacitors.
- Verify amp draw and temperature split to confirm restored performance.
"I called Lanz in the morning, and they came out early in the evening... had our air conditioner up and running in an hour! Great service!"
Electrical Components That Stop Cooling
Even with good airflow and clean coils, a failed electrical part can keep your system from cooling.
Usual suspects we diagnose and replace:
- Capacitors that hard-start the compressor or blower
- Contactors that send power to the outdoor unit
- Control boards and relays inside the air handler or furnace
- Thermostat failures
Signs to watch:
- Outdoor fan not spinning while the indoor blower runs
- Frequent clicking but no compressor start
- Breaker trips after the unit tries to start
Our process: We always begin by assessing the overall state of your system. Once the problem has been resolved, we’ll test your system and make any necessary adjustments. Finally, we finish the job by carefully cleaning up and restoring our work area.
"Will was great! He fixed our A/C in a pinch... timely and efficient and got the job done before they got in. Thank you!"
Condensate Drain and Safety Switch Issues
If your drain line clogs, a float switch can shut cooling off to prevent water damage. The indoor blower may still run, tricking you into thinking the AC is working.
DIY checks:
- Look for water around the indoor unit or a full secondary drip pan.
- If you are comfortable, clear the drain at the cleanout with a wet/dry vacuum.
Professional fix:
- Clear and flush the condensate line.
- Add algae treatment and confirm the float switch wiring is correct.
Duct Leaks and Attic Heat Gain
Central Illinois homes with older ductwork often lose cooled air into attics or crawl spaces. That forces long run times and uneven room temperatures.
What we look for:
- Disconnected or leaky joints near plenums
- Undersized returns starving the system
- Insulation gaps in attic knee walls and around can lights
Upgrades that help:
- Duct sealing and balancing
- Adding return air to problem rooms
- Attic air sealing and insulation improvements
Result: Better airflow, lower utility bills, and rooms that finally match the thermostat.
Wrong Mode or Heat Pump Quirks
If you have a heat pump, incorrect thermostat programming can command the wrong mode. Also, some thermostats set to Fan On will circulate air without cooling.
Quick resets:
- Set Fan to Auto.
- Confirm Cool mode and the correct schedule.
- Power-cycle the system at the breaker for 2 minutes if controls are unresponsive.
When Repair Beats Replacement… And When It Doesn’t
You deserve an honest diagnosis. We don’t believe in pushing unnecessary services or using high-pressure sales tactics. Here is our decision framework:
Repair likely makes sense if:
- The system is under 10 years old and well maintained.
- The issue is minor, like a capacitor, contactor, or drain clog.
- Parts are readily available and the refrigerant is current.
Consider replacement if:
- The compressor or coil has failed and the unit is older.
- Efficiency is poor and summer bills keep rising.
- Your system uses obsolete refrigerant and has recurring leaks.
If it turns out that your system is beyond repair, we will recommend an AC replacement that meets your needs and get it installed with the utmost care. As a Trane Comfort Specialist and Mitsubishi Diamond Dealer, we offer high-efficiency options and strong warranties.
What a Professional AC Repair Visit Includes
With Lanz, you get a complete repair workflow, not a quick guess:
- Detailed diagnostic
- Verify thermostat and control signals
- Measure static pressure, temperature split, and refrigerant readings
- Precise repair
- Correct the root cause, replace only failed parts
- Post-repair testing
- Confirm proper cycling, capacity, and safety protections
- Clean finish
- Restore panels and work area, review maintenance tips with you
Many common AC repairs can be avoided entirely with proper preventive maintenance. Becoming a Comfort Family member gives you peace of mind knowing your system is taken care of before you need it most, all while enjoying exclusive perks!
Transparent Pricing and Emergency Response
- Flat-rate pricing. You will know the cost before work begins.
- Typical AC repairs range from $100 to $600. Major components like compressors can be $1,000 or more.
- 24/7 emergency response across Champaign, Urbana, Savoy, Mahomet, Rantoul, and nearby towns. Members receive guaranteed response times and pay no emergency dispatch fees per plan level.
"We are senior citizens and our air conditioning went out during a recent heat wave. Lanz made every effort to expeditiously obtain the parts needed to repair it for us... We will definitely use them again."
Preventive Steps to Keep Cooling Strong All Summer
- Replace filters every 1 to 3 months.
- Keep 2 feet of clearance around the outdoor unit.
- Rinse the condenser fins gently in spring and mid-summer.
- Do not close supply vents to “push” air elsewhere. It hurts airflow.
- Schedule precision maintenance each spring to catch failing capacitors, dirty coils, and drainage issues before the heat hits.
Comfort Family highlights:
- Blue Comfort Family: Guaranteed Service within 24 Hours, $59 dispatch fee, 7 days a week, no emergency dispatch fees, 15% off service repairs, and scheduled HVAC maintenance.
- Orange Comfort Family: Guaranteed Same-Day service, $49 dispatch fee, 7 days a week, no emergency dispatch fees, 25% off service repairs, and scheduled HVAC maintenance.
Result: Fewer breakdowns, stronger cooling, and longer equipment life.
Special Savings With the Lanz Comfort Family
Keep your AC running at peak performance and cut repair bills:
- Blue Comfort Family Membership: Guaranteed Service within 24 Hours, $59 dispatch fee, 7 days a week, NO Emergency Dispatch Fees, scheduled HVAC precision maintenance, common air filters provided, and 15% off service repairs.
- Orange Comfort Family Membership: Guaranteed Same-Day service, $49 dispatch fee, 7 days a week, NO Emergency Dispatch Fees, scheduled HVAC precision maintenance, common air filters provided, and 25% off service repairs.
Join today and lock in priority service during heat waves. Call 217-559-9454 or visit https://lanzinc.com/ to enroll.
Frequently Asked Questions
Why is my AC running but not cooling after I changed the filter?
A clogged coil, low refrigerant, or a failed capacitor can still block cooling. If airflow and vents are clear and the outdoor fan spins, schedule a diagnostic to test refrigerant and electrical parts.
Can I hose off my outdoor unit to improve cooling?
Yes. Turn power off first. Gently rinse from the outside in to wash dirt from the fins. Maintain 2 feet of clearance. Avoid bending fins or using high pressure.
What should I do if I see ice on my AC lines?
Turn the system off and set the fan to On for 2 to 4 hours to thaw. Do not chip ice. After thawing, replace the filter and call for service to check airflow and refrigerant.
How much does AC repair usually cost?
Most repairs fall between $100 and $600. Major components, like compressors, can exceed $1,000. We provide flat-rate pricing after diagnosis so you know the cost upfront.
Do you offer emergency AC repair on nights and weekends?
Yes. We perform 24/7 emergency repairs on all types of air conditioners. Comfort Family members receive guaranteed response times and no emergency dispatch fees per plan.
In Summary
If your AC is running but not cooling, start with thermostat, filter, vents, and the outdoor unit. If that does not fix it, we will pinpoint the issue fast with a proven diagnostic process and flat-rate pricing. From capacitors to coils and refrigerant leaks, we repair it right or guide you on smart replacement.
Ready for Relief?
Call 217-559-9454 or schedule at https://lanzinc.com/ for fast AC repair near Champaign-Urbana. Ask about the Comfort Family for up to 25% off repairs and guaranteed response times.
Call now for 24/7 AC repair at 217-559-9454 or book online at https://lanzinc.com/. Mention the Lanz Comfort Family to unlock priority response and member discounts on repairs.
About Lanz Plumbing, Heating & Cooling, Inc.
Family-owned since 2002, we serve Champaign-Urbana and surrounding communities with honest diagnostics, flat-rate pricing, and a 100% satisfaction guarantee. Our EPA-certified, manufacturer-trained technicians and Trane Comfort Specialist designation reflect high technical standards. With 115+ team members and about 90 trucks, we respond fast, including 24/7 emergency AC repairs. As a Mitsubishi Diamond Dealer, we offer leading warranties on ductless options. Join the Lanz Comfort Family for guaranteed response times, member pricing, and routine maintenance that protects your system and budget.