It's the middle of a sticky July afternoon in Kenner. Your air conditioner is humming away, the thermostat says 72, but the house feels like it's stuck at 82 and climbing. You can hear the system running, so why isn't it doing its job? If this sounds familiar, you're in good company. It's one of the most common calls we get across the Greater New Orleans area, from Metairie to Mandeville.
At Air Orleans AC, Heating and Air Quality, this exact complaint drives a large share of our summer service work. Our owners, Mike Lanoue and Raiko Piloto, bring a combined lifetime of hands-on HVAC experience, Mike started in the trade at 18, following his father into the business. As NATE-certified and EPA-licensed technicians, we diagnose "running but not cooling" problems constantly, and here's what every Louisiana homeowner should understand before picking up the phone.
When your AC runs but doesn't cool, it usually means the system is moving air but failing to remove heat from that air. The most common reasons are a dirty air filter, low refrigerant from a leak, frozen evaporator coils, or a dirty outdoor condenser, all worsened by New Orleans heat and humidity. Some fixes are simple; others require a licensed technician.
When to call a professional: If you've replaced the filter, cleared the outdoor unit, and checked the thermostat but the house still won't cool, or if you see ice on the system or smell anything burning, it's time to schedule a diagnostic. Air Orleans can often be out within an hour.
A dirty air filter is the single most common cause of poor cooling, and the easiest to overlook. The filter sits in the return airflow, trapping dust, pet dander, and pollen before air passes over the evaporator coil. When it clogs, airflow drops sharply, so even though the blower runs, very little cooled air reaches your rooms. Homeowners typically notice weak airflow from the vents, uneven temperatures, and a system that runs constantly without satisfying the thermostat. Why it happens: filters are simply forgotten, many people go six months or longer without a change. The risk is significant: restricted airflow can cause the evaporator coil to freeze over, leading to a complete cooling loss and potential compressor strain. In our service area, high pollen counts from spring oak trees and year-round dust make filters clog faster than the national average. We tell Kenner and Metairie homeowners to check filters monthly during cooling season and replace them at least every 60 to 90 days.
Refrigerant is the substance that absorbs heat inside your home and releases it outside. When levels drop, the system keeps running but can't remove enough heat, so the air coming out feels only slightly cool, or warm. Homeowners often notice longer run times, higher power bills, hissing or bubbling sounds near the lines, and sometimes ice on the copper tubing. Contrary to a common myth, refrigerant is not "used up", a low charge always means there's a leak somewhere in the system, often at coil joints, Schrader valves, or corroded connections. The risks of ignoring it are serious: running low on refrigerant overheats and can permanently destroy the compressor, the most expensive component in the system. In our humid coastal climate, salt air and constant condensation accelerate corrosion on refrigerant lines, especially in older systems around Chalmette, Arabi, and the Westbank. Handling refrigerant legally requires EPA Section 608 certification, which our technicians hold.
The evaporator coil, located inside your air handler, is where refrigerant absorbs heat from your indoor air. When airflow is restricted or refrigerant is low, the coil gets too cold and moisture freezes onto it. Ironically, a block of ice on the coil insulates it and stops cooling entirely, so the system runs hard while blowing warm air. Homeowners notice weak airflow, water pooling around the indoor unit as ice melts, and sometimes visible frost on the copper lines. Why it happens: dirty filters, closed vents, low refrigerant, or a failing blower motor all reduce airflow across the coil. Left alone, a frozen coil can lead to water damage and compressor failure. Louisiana's extreme humidity makes freezing more likely because there's simply more moisture in the air to condense and freeze. If you see ice, turn the system off and let it thaw fully before calling, running it frozen only makes things worse.
The outdoor unit's job is to release the heat your system pulled from inside your home. It does this through the condenser coil, a set of thin metal fins that need clean airflow to work. When those fins get coated in grass clippings, dirt, cottonwood fluff, or lawn debris, the unit can't shed heat, so the whole cooling process stalls even while the fan spins. Homeowners notice the outdoor unit running hot, cooling that gets worse on the hottest days, and rising energy bills. Why it happens: the condenser sits outside year-round collecting whatever the yard throws at it. The risk is elevated head pressure, which strains the compressor and shortens its life. In our area, heavy rainfall, mud, and rapid plant growth mean outdoor coils get filthy fast, we regularly clean units in Slidell and Covington packed solid with organic debris. Keep at least two feet of clearance around the unit and rinse the fins gently each season.
The compressor is the heart of your AC, it pressurizes refrigerant so it can absorb and release heat. The capacitor gives the compressor and fan motors the jolt of energy they need to start. When a capacitor weakens, the fan may spin but the compressor struggles to engage, so air moves without ever getting cold. Homeowners often hear a humming or clicking sound from the outdoor unit, notice it tripping the breaker, or find the fan running while the unit blows lukewarm air. Why it happens: capacitors degrade over time, and Louisiana's brutal summer heat accelerates the breakdown. A dead capacitor is a relatively affordable fix; a failed compressor is one of the costliest repairs on any system. Ignoring early capacitor symptoms is a leading path to compressor failure. Frequent power flickers and surges common during Gulf storm season put extra stress on these electrical components across the Northshore and Southshore.
Sometimes the AC itself is fine, the thermostat is giving it bad instructions. A thermostat that's miscalibrated, set to the wrong mode, has weak batteries, or has a wiring fault may fail to signal the compressor properly. Homeowners notice the system running at odd times, cooling that never matches the setting, or a screen that's blank or frozen. Why it happens: dead batteries are surprisingly common, and older thermostats drift out of calibration or lose their wiring connection. The "fan" setting left on "ON" instead of "AUTO" also fools people, the blower runs nonstop circulating uncooled air between cooling cycles. The risk is mostly comfort and wasted energy, but a bad thermostat can also cause short cycling that wears out components. Upgrading to a modern programmable or smart thermostat, which we install throughout Kenner and Metairie, often solves the issue and lowers cooling bills.
Your ducts carry cooled air from the air handler to every room. If they leak, that expensive cold air escapes into attics, crawl spaces, and wall cavities before it reaches you. Homeowners notice certain rooms that never cool, a system that runs forever, and dust blowing from vents. Why it happens: duct tape fails, joints separate, insulation degrades, and rodents chew through flexible ductwork over the years. Studies show poorly sealed ducts can waste 20 to 30 percent of conditioned air. The risks include high bills, uneven comfort, and moisture intrusion. In Greater New Orleans, ducts routed through blistering attics face intense heat, and older homes in areas like Gretna and Marrero frequently have deteriorated ductwork. Air Orleans offers ductwork repair and can perform an assessment to find and seal the leaks robbing your comfort.
Sometimes the equipment simply can't keep up. An AC that's too small for the square footage, or one that's 12 to 15-plus years old and worn out, will run nonstop yet never reach the set temperature on extreme days. Homeowners notice the unit never shuts off, struggles most during the hottest hours, and delivers steadily declining performance year over year. Why it happens: undersizing usually stems from a poor original installation, while age brings compounding wear on every component. The risk is skyrocketing energy bills and eventual total failure at the worst possible moment. On a 95-degree Louisiana afternoon, even a healthy system may only cool your home to about 20 degrees below the outdoor temperature, but if yours can't manage that, capacity is likely the culprit. If the system is old and repairs are stacking up, replacement often becomes the smarter investment. The ENERGY STAR guide to central air conditioners is a helpful reference on efficiency and sizing.
Before you call, run through these safe checks, they resolve a surprising number of cases:
Safety reminder: Never open the electrical compartment of your outdoor unit or attempt to add refrigerant yourself, both require training and EPA certification. If basic checks don't fix it, let a licensed technician take over.
Deciding between a repair and a full replacement comes down to age, cost, and reliability. Use these frameworks:
Repair when:
Replace when:
Air Orleans believes in long-term solutions over quick sales, we'll give you an honest assessment and never pressure you toward a replacement you don't need. We install trusted Goodman and Lennox systems, and as a Lennox Premier Dealer, we can match the right size and efficiency to your home.
Every situation is different, but here are realistic ranges to set expectations. Air Orleans uses transparent flat-rate pricing, and our standard diagnostic fee is $90, which is applied toward any work performed (emergency after-hours diagnostics are $150).
Sample scenarios:
Factors that affect price:
Air Orleans offers financing, and our Big Easy Membership members receive 15% off repairs.
When you call Air Orleans about an AC that's running but not cooling, here's what to expect:
Metairie: Warm air on the hottest week of summer. A homeowner called with a system running around the clock but blowing lukewarm air. Our diagnostic revealed a heavily corroded refrigerant line joint leaking near the outdoor unit, accelerated by years of exposure to humid, salty coastal air. We located and repaired the leak, recharged the system to the correct level, and cooling returned to normal within the appointment. We also flagged the aging line set for future monitoring.
Kenner: Ice on the indoor unit. A family found water pooling near their air handler and frost on the copper lines. The culprit was a filter that hadn't been changed in nearly a year, which starved the evaporator coil of airflow and froze it solid. We let the coil thaw, replaced the filter, cleaned the coil, and confirmed proper airflow. We enrolled them in seasonal maintenance to prevent a repeat.
Slidell: Fan running, no cold air. A Northshore homeowner heard a humming sound from the outdoor unit but got no cooling. Diagnosis showed a failed run capacitor, common after our storm-season power fluctuations. A quick capacitor replacement had the compressor and cooling back online the same visit, a reminder that catching electrical parts early protects the expensive compressor.
Your AC is moving air but failing to remove heat from it, usually due to a dirty filter, low refrigerant, a frozen evaporator coil, or a dirty outdoor condenser. Start by replacing the filter and clearing debris from the outside unit. If cooling doesn't improve, an Air Orleans technician can diagnose the exact cause across Kenner and Greater New Orleans.
Turn the thermostat to OFF, then shut the system off at the breaker for about five minutes before restoring power. This resets the internal controls and can clear a stuck cycle. If the unit was frozen, let it thaw fully first. If resetting doesn't restore cooling, the problem is mechanical and needs professional diagnosis.
Signs of low refrigerant include weak or warm airflow, ice on the copper lines or coil, hissing or bubbling sounds, long run times, and rising energy bills. Because low refrigerant always signals a leak, and handling it legally requires EPA certification, this is not a DIY fix. Air Orleans technicians locate the leak before recharging the system.
A properly functioning AC typically cools a home to about 20 degrees below the outdoor temperature, so on a 90-degree day expect roughly 70–72 indoors. Extreme Louisiana heat and humidity can widen that gap. If your system can't reach within 20 degrees on hot afternoons, it may be undersized, low on refrigerant, or overdue for service.
An AC that can't get below 80 is usually struggling with restricted airflow, low refrigerant, a frozen coil, or an aging system that's lost capacity. On our hottest, most humid days, a marginal system simply can't keep up. Have a technician check refrigerant levels, airflow, and coil condition to pinpoint whether it's repairable or nearing replacement.
Yes, a clogged filter is one of the most common reasons an AC runs without cooling. It restricts airflow across the evaporator coil, which reduces cooling output and can even freeze the coil solid, stopping cooling entirely. In our high-pollen, dusty region, we recommend checking your filter monthly and replacing it every 60–90 days.
You can confirm any mechanical contractor's license through the Louisiana State Licensing Board for Contractors. Always hire licensed, insured technicians for refrigerant and electrical work. Air Orleans is licensed, bonded, insured, BBB accredited with an A+ rating, and Google Guaranteed, with NATE-certified, EPA-licensed technicians serving Greater New Orleans.
An air conditioner that runs but won't cool is frustrating, especially during a Louisiana summer, but it's almost always fixable, and often faster and more affordable than homeowners expect. The team at Air Orleans AC, Heating and Air Quality brings decades of hands-on experience, NATE certification, and honest flat-rate pricing to every visit, treating your home like family. We serve Kenner, Metairie, New Orleans, the Westbank, and the entire Northshore, with same-day and 24/7 emergency service. Call us at (504) 874-4877 or reach out online at airorleans.com. Sincere integrity, comfort guaranteed.
Choosing the right HVAC company is essential for your home's comfort and safety. At Air Orleans AC, Heating and Air Quality , we take pride in delivering honest, high-quality service to our community. With over 25 years of experience and industry certifications like NATE and BPI, we bring proven expertise to every project. We believe in doing the job right the first time, ensuring your system runs efficiently for years to come. When you choose us, you're choosing a team that values your comfort and well-being. Call 504-874-4877 today for trusted HVAC services you can count on.
When it comes to your home's heating and cooling needs, trust the experienced team at Air Orleans AC, Heating and Air Quality to provide top-tier service. With over 25 years of industry experience and certifications like NATE and BPI, we deliver expert solutions for every HVAC challenge. Whether you need an urgent AC repair, a heating system upgrade, or professional commercial HVAC, don't wait to restore comfort to your home or business - call us at 504-874-4877 today for fast, reliable HVAC service in , LA!
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Air Orleans proudly serves Southeast Louisiana with reliable, expert HVAC solutions. From the Southshore to the Northshore, our skilled technicians provide fast, friendly service to homes and businesses across the region. Whether you're in Metairie, Covington, Kenner, or anywhere in between, trust Air Orleans for all your heating and cooling needs.
