Monday - Saturday : 9:00 AM to 6:30 PM 
Call our AC Experts 504-636-8724
In New Orleans, where summer runs from April through October and the outdoor unit never truly gets a break, your air conditioner communicates when it needs attention long before it fails completely. Most homeowners miss the early signals because they do not know what to look for. By the time the system stops cooling on a 98-degree day in July, the warning signs were visible for weeks. This page documents every major sign that your AC needs maintenance, what is causing it, and how urgently you need to act. For professional service, see our AC maintenance page or call us directly.
A 10% to 15% increase in your electricity bill, with no corresponding change in how you use your home, is one of the most reliable early indicators of AC maintenance problems. It is also the easiest to dismiss as a rate increase or billing error, which is why it gets missed until the efficiency loss is severe.
Your AC’s energy consumption rises when it has to work longer to achieve the same result. Dirty condenser coils reduce the system’s ability to reject heat to the outdoor air, raising system pressure and forcing the compressor to draw more amperage. A clogged filter restricts airflow and makes the blower motor work harder. Low refrigerant charge causes the system to run extended cycles trying to reach set temperature because its heat absorption capacity is reduced. Any one of these problems adds 10% to 20% to energy consumption. When multiple problems exist simultaneously, efficiency losses of 30% to 40% are realistic.
Pull your utility bills from the same months in the previous one or two years and compare. If bills are higher with similar outdoor temperatures and no major change in occupancy or appliances, the AC is the most likely culprit. You can also check your smart meter data if your utility provides it. A system that used to achieve set temperature in 20-minute cycles that now runs 35-minute cycles for the same result is using roughly 75% more electricity for that task.
If supply air from your vents is not noticeably cool, something is wrong. In normal operation, supply air should be 14 to 22 degrees Fahrenheit cooler than the air returning to the system through the return register. You can measure this with a $15 digital thermometer.
Refrigerant is the working fluid that absorbs heat from indoor air and rejects it outdoors. When refrigerant is low, the evaporator coil cannot absorb enough heat, and the air coming out of your vents feels only mildly cool rather than cold. The common misconception is that refrigerant runs out like gas in a car. It does not. If refrigerant is low, there is a leak somewhere in the sealed system. Adding refrigerant without finding and fixing the leak is a temporary solution that leaves the leak getting worse. Signs of refrigerant problems include hissing sounds near the indoor or outdoor unit, ice on the refrigerant line, or bubbling sounds inside the air handler.
The evaporator coil must be clean to transfer heat effectively. A coil coated in dust, mold, or biofilm has reduced heat transfer capacity, which means the refrigerant passes through without absorbing as much heat as it should. The result is supply air that is warmer than it should be, even though the system is running normally by all other measures. Evaporator coil cleaning is a professional service that requires removing the coil access panel and applying no-rinse coil cleaner.
A failing compressor may still run but at reduced capacity, producing inadequate pressure differential and warm supply air. Compressor problems often show up as hard starting (the system takes several attempts to kick on), unusual noises from the outdoor unit, or compressor amp draw significantly above nameplate specifications. Compressor diagnostics require a technician with manifold gauges and an ammeter.
Weak airflow from your supply registers is an immediate sign that something is restricting or bypassing airflow in your system. In New Orleans, where the system runs hard for 10 months, airflow problems compound quickly.
The most common cause of poor airflow is a filter that is past its service life. In New Orleans, this happens faster than most homeowners expect. A clogged filter restricts the volume of air the blower can move, reducing airflow throughout the duct system. In addition to reducing comfort, a clogged filter causes the evaporator coil to get colder than it should (because less warm air is passing over it), which leads to ice formation on the coil that further restricts airflow in a feedback loop.
The blower motor moves air through the system. A motor that is failing due to worn bearings, overheating, or degraded capacitor support will run at reduced speed, cutting airflow to some or all registers. Signs of a failing blower include a humming sound at startup without the fan spinning, reduced airflow that worsens over time, or the motor getting abnormally hot to the touch. A dirty blower wheel, which accumulates debris over a New Orleans cooling season, creates imbalance and causes the same symptoms as motor wear.
Disconnected, collapsed, or improperly sealed ducts send conditioned air into your attic or crawl space instead of your living areas. In New Orleans, where attic temperatures reach 140 to 150 degrees Fahrenheit in summer, a disconnected duct joint represents a significant and immediate comfort and energy problem. Static pressure testing by a technician identifies duct problems that cannot be found by visual inspection of accessible sections alone.
This is one of the most distinctly New Orleans signs of AC trouble. In a city where outdoor relative humidity averages 73% year-round, your air conditioner’s ability to dehumidify is as important as its ability to cool. When a maintained system is running properly, indoor humidity should stay between 45% and 55%, which is the comfort range for occupied spaces.
As warm, humid indoor air passes over the cold evaporator coil, moisture condenses on the coil surface and drips into the drain pan, just as water condenses on a cold glass. This condensation process removes humidity from the air before it is recirculated into the living space. When this process is compromised, indoor humidity rises even while the air temperature stays at the thermostat set point.
The most common causes of inadequate dehumidification in New Orleans are an oversized AC system, low refrigerant charge, and a dirty evaporator coil. An oversized system cools the air so quickly that it does not run long enough to remove sufficient moisture before shutting off. Low refrigerant reduces the temperature differential across the coil, reducing condensation. A dirty coil has reduced surface area for condensation. In all three cases, the solution requires professional diagnosis because the symptoms (high indoor humidity) are identical regardless of the cause.
If your AC system is correctly sized and properly maintained but still cannot keep indoor humidity below 60% during peak New Orleans humidity months (June through September), a supplemental whole-home dehumidifier installed on the air handler is worth considering. This is a separate appliance, not a replacement for AC maintenance, and a technician can advise on sizing and installation.
Your AC system should operate with a consistent, low-level sound: the hum of the compressor, the steady rush of air through registers, and the click of the thermostat cycling. Any new sound that deviates from this baseline is a maintenance signal.
Grinding usually comes from the blower motor or condenser fan motor and indicates worn or dry bearings. Bearings that run dry will eventually seize, stopping the motor entirely. This is a progressive problem, meaning the sound will worsen over time until the motor fails completely. If you hear grinding, schedule a service call within a day or two, not several weeks out.
Squealing from the outdoor unit is often a worn condenser fan bearing or a failing start capacitor that causes the motor to spin up slowly with belt-like friction. Squealing from the indoor unit often indicates a worn blower belt in older systems or a bearing issue in the blower motor. On newer systems, a squeal at startup that goes away after a few seconds may be a capacitor beginning to fail.
Banging often indicates a loose or broken component inside the outdoor unit, such as a broken compressor mounting spring or a loose fan blade. Rattling from supply registers usually means a loose register cover or a screw that has vibrated free. Rattling from the air handler cabinet can indicate a loose blower wheel or a foreign object in the blower assembly. Do not ignore banging sounds from the outdoor unit, as a broken component striking other parts during operation can cause cascading damage.
Hissing near the refrigerant lines or the outdoor unit almost always indicates a refrigerant leak. This requires immediate professional attention. A refrigerant leak that is ignored worsens over time, and a severely undercharged system will destroy the compressor due to inadequate lubrication and heat management.
Odors from an AC system are a quality-of-life problem at minimum and a health concern in New Orleans, where mold-related illness is a genuine risk in the subtropical climate.
A musty odor when the AC runs almost always indicates mold or mildew on the evaporator coil, in the drain pan, in the condensate drain line, or in the ductwork. In New Orleans, where the evaporator coil stays cold and wet for most of the year, mold colonization on the coil is not unusual, it is expected in systems that have not been cleaned on schedule. The mold is then blown through the duct system and into the living space every time the fan runs. For households with asthma, young children, or immunocompromised individuals, this is a health concern that warrants urgent professional attention rather than masking with air fresheners.
A burning smell, particularly at the beginning of a cooling season, can sometimes be dust burning off heating elements during the first heat cycle. If a burning smell persists or appears mid-cooling season, it indicates an electrical problem: overheating wiring, a failing motor winding, or a failing control board. Shut the system down and call for service immediately. Continuing to run a system with an electrical burning smell risks both component damage and fire.
A sulfur or rotten egg odor is not typically HVAC-related and more often indicates a gas leak. If you smell sulfur near your HVAC system, leave the home, do not operate electrical switches, and call the gas company from outside before calling an HVAC technician.
A normally functioning AC system completes a cooling cycle in roughly 15 to 20 minutes under average load, shuts off when it reaches set temperature, and then remains off for a similar period before the next cycle. Short cycling refers to the system turning on and off in rapid succession, often running for only a few minutes before shutting off.
The most common causes of short cycling are an oversized system, low refrigerant charge, a dirty evaporator coil that causes the safety thermostat to trip, a failing compressor that cannot sustain operating pressure, or a thermostat sensor problem. Short cycling is a problem on multiple levels: it prevents the system from completing enough of a cycle to adequately dehumidify the air, it increases compressor wear (because starting and stopping is harder on the compressor than sustained operation), and it drives up energy consumption because the startup amp draw is much higher than running amp draw.
An oversized system is a particularly common problem in New Orleans because of the high humidity. A system that is too large for the home cools the air temperature to set point before it has run long enough to pull meaningful moisture from the air. The result is a home that feels cold but clammy: the thermostat is satisfied, but the humidity remains high. If your system short cycles and you also experience high indoor humidity, ask your technician to do a Manual J load calculation to verify the system is appropriately sized for your home.
Ice on your AC unit, either on the refrigerant line near the outdoor unit or on the evaporator coil inside the air handler, is always a sign of a problem. Air conditioners are not supposed to produce ice, and running a system that is icing up causes direct compressor damage in addition to eliminating any cooling effect.
Ice forms on the evaporator coil when the coil temperature drops below the dew point of the air passing over it and below freezing. This happens in two scenarios: restricted airflow (from a clogged filter, closed registers, or a failing blower motor) that reduces the heat load on the coil, or low refrigerant charge that lowers evaporator pressure below normal operating range. In both cases, the coil gets colder than it should, and ice builds up.
Turn the system off immediately. Do not try to chip away the ice or run the system in an attempt to melt it faster. Set the thermostat to “fan only” to run the blower without the compressor, which helps the ice melt and drains through the condensate system. While waiting for the ice to melt, check the air filter. If it is severely clogged, replacing it may resolve the problem. If the filter is clean and ice forms again after the system restarts, the problem is refrigerant-related or blower-related and requires a technician.
The urgency of each sign varies significantly. Here is a practical guide to response timing.
The critical mistake most homeowners make is putting a one-to-two-week problem in the “wait for next maintenance” category during July or August. In New Orleans, system failures in peak summer are not an inconvenience, they are a health emergency for elderly residents, infants, and anyone with respiratory conditions. When in doubt, call sooner.
Rising energy bills, warm or insufficiently cool air from vents, poor airflow, high indoor humidity despite the AC running, strange noises (grinding, squealing, banging), musty odors, short cycling, and ice forming on the unit or refrigerant line. New Orleans homes experience all of these at higher frequency than most climates because of the extended cooling season and constant humidity exposure.
A musty smell when the AC runs almost always means mold or mildew on the evaporator coil, in the drain pan, or in the ductwork. In New Orleans, mold on the evaporator coil is common in systems that have not been professionally cleaned on schedule because the coil stays cold and wet for most of the year. That mold gets blown through your living space with every fan cycle.
The most common causes are low refrigerant due to a system leak, a dirty evaporator coil with reduced heat transfer capacity, a failing compressor, or a severely restricted air filter. Low refrigerant is the most frequent culprit in New Orleans homes, particularly in systems more than five years old. All of these require a technician with proper diagnostic equipment.
Short cycling means your system turns on and off in rapid succession, running only a few minutes per cycle. This prevents the system from completing enough of a run to dehumidify your indoor air, which is critical in New Orleans. It also accelerates compressor wear because startup draws far more amperage than sustained operation. Common causes are refrigerant problems, an oversized system, or a failing compressor.
Ice means the evaporator coil is getting colder than it should because of restricted airflow (clogged filter, closed registers, failing blower motor) or low refrigerant charge. Turn the system off immediately. Set the fan to “on” (not “auto”) to melt the ice. Check the filter. If the filter is clean and ice returns after restart, call a technician. Running an iced-up system damages the compressor.
In New Orleans, this almost always means your system is not dehumidifying effectively. Causes include an oversized system that cools too fast to remove moisture, low refrigerant that reduces condensation on the evaporator coil, or a dirty coil with reduced surface area. Indoor humidity above 60% creates mold growth conditions throughout your home.
Grinding indicates worn or dry bearings in the blower motor or condenser fan motor. This is a progressive problem that worsens until the bearing seizes and the motor stops. Schedule a service call within one to two days. Waiting weeks risks a complete motor failure during peak summer heat.
Signs of low refrigerant include air from vents that is not cold, hissing sounds near the unit, ice on the refrigerant line or evaporator coil, and the system running unusually long cycles without reaching set temperature. A technician must verify refrigerant charge with manifold gauges. Handling refrigerant requires EPA 608 certification and is illegal for uncertified individuals.
If your AC is showing any of these signs, do not wait. Call Big Easy Air Conditioning at 504-636-8724, Monday through Saturday, 9 AM to 6:30 PM. We diagnose and fix AC problems across New Orleans, Metairie, Kenner, Gretna, Mandeville, Covington, Madisonville, Slidell, Hammond, LaPlace, and surrounding communities.