By Scott Gieseler · Published · Updated
If your AC is running but not cooling, start with the thermostat settings and a safely accessible filter. Warm air can have several causes, from restricted airflow to equipment faults. Stop cooling if you see ice or leaking water, and leave electrical, refrigerant, and internal component repairs to a qualified technician.
Use the checks below to describe what is happening, then review the common causes and repair considerations. Need AC service in Kenner, Metairie, or Greater New Orleans? Skip the phone call and book online, or call (504) 414-8655.
AC Running But Not Cooling in Kenner and Metairie: First Checks
If your AC is running but not cooling in Kenner or Metairie, these accessible checks can help you describe the problem. They cannot rule out equipment faults.
- Thermostat. Check cool mode, the fan setting, and the set temperature. Allow any startup delay described in the manual. Stop the checks if you notice ice, leaking water, burning odors, or unusual mechanical noise.
- Eco or smart schedules. Check whether a schedule or temporary hold changed your setpoint. Adjust it to the temperature you intend to maintain, following the thermostat instructions.
- Air filter. Inspect it with the system off. Use the size and filter rating approved for the equipment, and follow the replacement interval and condition checks in the manual. A light test alone cannot assess every filter type.
- Vents and returns. Move furniture and rugs away from grilles. Follow the setup for any zoned system rather than changing dampers or closing registers to force airflow elsewhere.
- Outdoor unit. Remove loose debris from the surrounding area and maintain the manufacturer’s clearances. Leave internal coil cleaning to a qualified HVAC technician; do not open panels, reach inside the unit, or spray electrical components.
- Breaker panel. A tripped breaker may indicate an electrical fault. Leave the AC off and arrange service rather than repeatedly resetting it. Do not touch a wet, hot, damaged, buzzing, or smoking panel. If you see smoke or fire, leave the home and call 911 from a safe location outside.
Outdoor equipment needs inspection for corrosion, debris, and dirty coils. Cleaning can support heat transfer, but a lower monthly bill is not guaranteed.
Why Is My AC Not Blowing Cold Air?
An air conditioner relies on several components working together to cool your home. If even one part is blocked, broken, or not maintained, the AC unit will struggle to produce cool air. Common culprits range from clogged air filters and thermostat issues to refrigerant leaks and frozen evaporator coils.
Catching the problem early can prevent high energy bills and major air conditioner repair costs. Let’s dive into the common reasons for an AC unit that’s not cooling properly.
Top Common Reasons Your AC Isn’t Cooling
1. Dirty or Clogged Air Filter
One of the simplest problems is also one of the most overlooked. The air filter traps dust, dirt, and debris before they enter your AC system. Over time, it becomes clogged, restricting airflow and making it harder for the air conditioner to circulate conditioned air.
Signs of a clogged filter:
- Weak airflow from vents
- Dust buildup around registers
- Increased energy bills
Quick check: Inspect the filter monthly during heavy use and follow the filter and equipment instructions for replacement. Replace disposable filters; wash only filters designed to be reusable. Turn the system off and follow the manual before accessing the filter.
2. Low Refrigerant Levels
Refrigerant carries heat through the system. Low charge can reduce cooling, but warm air alone does not establish a refrigerant leak. Airflow, controls, and electrical faults can cause similar symptoms.
Signs of low refrigerant:
- Warm air from vents
- Ice forming on the evaporator coil
- Hissing or bubbling sounds
Unlike filter changes, fixing a refrigerant leak requires professional air conditioner repair. A certified AC technician can repair the leak, recharge the system, and restore blowing cool air.
3. Thermostat Issues
Sometimes the issue lies with the thermostat instead of the air conditioning unit. If it’s miscalibrated or set incorrectly, the system may blow warm air.
Things to check:
- Ensure it’s set to “cool” and not “fan” or “heat”
- Replace old batteries
- Set the temperature below the current indoor temperature
If these checks do not restore cooling, schedule a diagnosis of the thermostat and HVAC system before replacing parts.
4. Frozen Evaporator Coils
The evaporator coil absorbs heat from indoor air. If it freezes, the AC unit’s ability to blow cold air is blocked. This usually happens due to low refrigerant or restricted airflow.
Symptoms include:
- Ice on the indoor unit
- The AC stopped blowing cold air
- Air isn’t coming out properly
Turn off your AC and call a professional before the problem damages other components.
5. Dirty Condenser Coils (Outdoor Unit)
Your central AC unit must expel heat outdoors. When the coils get dirty, the air conditioning system struggles, causing your AC to blow hot air instead.
Maintenance tips:
- Remove loose debris around the unit without opening panels or reaching inside
- Schedule coil cleaning during seasonal maintenance
- Follow the manufacturer’s required clearance around and above the system
6. Electrical or Mechanical Failures
Faulty motors, capacitors, or fans can keep your AC from working correctly. The system may be running but blowing only warm air.
Warning signs:
- Clicking or buzzing noises
- The unit suddenly blowing hot air
- Outdoor fan not working
Always rely on a professional for AC repair in these cases.
7. Ductwork Leaks or Blockages
Even if the AC is still blowing, damaged ducts keep cool air from reaching certain rooms.
Clues your ducts may be at fault:
- Uneven cooling
- Higher energy bills
- Whistling sounds
Sealing air ducts improves proper air circulation and efficiency.
Quick Fixes Before Calling a Pro
- Inspect the accessible air filter with the system off; replace or clean only as directed by the manufacturer
- Double-check thermostat settings
- Ensure outdoor condenser unit is clear of debris
- If a breaker has tripped, leave the AC off and arrange a check; do not keep resetting it
If your air conditioner is still not blowing cold air, it’s time to call a professional.
Preventing Future AC Problems
Preventative steps extend your system’s lifespan:
- Schedule seasonal cleaning, repair, and installation checkups
- Replace filters regularly
- Keep outdoor units clear
- Inspect ducts every few years
Why Choose Tegridy Air in Kenner, LA?
When your central air conditioner or heat pump isn’t cooling, you need fast and reliable air service. Tegridy Air provides professional air conditioner repair and maintenance to keep your home’s air comfortable.
We know the unique climate challenges in Kenner and the New Orleans area. Whether you need a quick AC repair, a refrigerant recharge, or a new installation, our team is ready.
Other Reasons an AC Runs but Blows Warm Air
- Failed capacitor or contactor. These components can cause humming, slow starting, or failure to run. Diagnosis and replacement belong to a trained technician; capacitors can retain a charge after power is off.
- Compressor trouble. A failing compressor cannot move heat, so the system runs without cooling. Watch for banging or clicking outside, run times that never end, and repeated breaker trips.
- Short cycling. Frequent starts and stops can have several causes, including airflow, control, refrigerant, or sizing problems. A technician should diagnose the cause before replacing parts.
- Not enough capacity. A system that was undersized to begin with may not keep up on a 95-degree afternoon. A load calculation shows whether the equipment matches the house.
- Weak blower motor. A blower problem can reduce airflow and cooling and may contribute to coil icing. A technician should check the cause.
Water Around the Indoor Unit or Ice on the Lines
Water around the indoor unit can come from a blocked drain, a damaged pan, drainage installation problems, or a thawing coil. Stop cooling and arrange service. Stay away from wet electrical equipment and protect the area from further water damage if you can do so safely.
If you see ice on the coil or refrigerant lines, turn cooling off and arrange service. Do not chip away the ice or apply heat. Thaw time varies, and thawing alone does not fix the cause. Leave the entire system off if water or electrical damage is present.
What These AC Repairs Usually Cost
- Air filter you buy and install yourself: $10 to $30
- Dispatch fee in Greater New Orleans: $109. Repairs are quoted after diagnosis.
- Capacitor replacement: $200 to $450 installed
- Blower motor replacement: $450 to $1,200 installed
- Refrigerant leak repair: $400 to $900, plus refrigerant at $125 to $225 per pound
- Recharging the system after a leak repair: $200 to $400
- Compressor replacement: $1,800 to $2,900 installed
Your total depends on the equipment and what the technician finds. Compare the written repair quote, equipment condition, warranty, repair history, and replacement cost. There is no universal repair-cost percentage or local lifespan that decides the best option.
When to Call Tegridy Air for AC Repair in Kenner
- A tripped breaker or other electrical warning signs
- Ice on the indoor coil or the refrigerant lines
- Water leaking around the indoor unit, or a stain on the ceiling below it
- Burning smells, or loud banging and grinding
- The outdoor fan spins but the compressor never starts
- The AC will not turn on at all
Tegridy Air is based in Kenner and serves Metairie, Harahan, Elmwood, Jefferson, Gretna, Chalmette, LaPlace, New Orleans, and the surrounding communities. Our technicians are certified and insured, and you get a written price before any work starts. Call (504) 414-8655 to schedule AC repair.
Frequently Asked Questions
Why is my AC running but not cooling?
The system is moving air but not removing heat. Usual causes are a thermostat set to fan instead of cool, a clogged filter, a blocked outdoor condenser, low refrigerant from a leak, or a failed capacitor. Check the thermostat, filter, and outdoor unit first.
Why is my AC leaking water in Kenner?
A clogged drain is one possible cause. A damaged pan, installation problem, or thawing coil can also leak water. Stop cooling, stay away from wet electrical equipment, and schedule service.
How long does a frozen AC take to thaw?
Thawing may take several hours, depending on the amount of ice and conditions. Turn cooling off, do not chip or heat the ice, and have the cause checked. Repeated freezing can involve airflow, refrigerant, or other faults; it is not proof of low charge.
Can I add refrigerant to my AC myself?
Leave refrigerant work to an EPA-certified technician. Low charge may result from a leak or an incorrect previous charge. The technician should find the cause and follow the equipment’s specified refrigerant and charging procedure.
Conclusion
When your air conditioner stops cooling, it may be due to a clogged air filter, refrigerant leak, or frozen evaporator coil. Some problems can be solved with simple cleaning or filter replacement, while others require a skilled AC technician.
Taking care of your air conditioning system through regular maintenance supports performance and can reduce the risk of preventable breakdowns. If your AC isn’t blowing cold air, call Tegridy Air today for trusted service.
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For general guidance, see Carrier’s cooling troubleshooting guide, Carrier’s frozen-AC guidance, and EPA’s refrigerant technician requirements. Follow your equipment’s manual for owner maintenance.