If your AC runs but does not cool, start by checking the filter, thermostat setting, and outdoor unit before calling a professional.
Many homeowners in Kenner and Metairie notice warm air coming from vents while the system stays on. The problem often feels urgent because the summer heat in South Louisiana can rise quickly. Before you assume a major failure, look at the simple items that can cause the issue.
We’ll walk through the most common culprits. Each step is something you can do in 15 minutes or less. If the problem persists, a local, certified and insured technician can diagnose it on site.
Check the Thermostat Settings
The thermostat is the first place to look. Make sure it is set to “cool” and that the temperature is lower than the current room temperature.
Many people accidentally leave the fan on “auto” while the system is in “heat” mode. In that case the blower will run but the compressor will not engage, so you feel air but no cooling.
Confirm that the fan setting is on “auto” as well. This tells the system to run the fan only when the compressor is calling for cooling.
If you have a programmable or smart thermostat, check the schedule. A mis-programmed schedule can keep the unit in “off” mode during the hottest part of the day.
Inspect the Air Filter
A clogged filter restricts airflow. When the blower can’t move enough air, the evaporator coil can freeze, and you end up with warm air.
Locate the return-air grille in your hallway or bedroom. The filter is usually a rectangular panel that slides out.
Take the filter out and hold it up to the light. If you can’t see light passing through, it’s time to replace it.
Replacing a filter costs a few dollars and takes less than five minutes. In homes that run the AC daily, change the filter every 30-60 days.
- Check the filter monthly during the cooling season.
- Use a filter with a MERV rating of 8-11 for most homes.
- Mark the replacement date on your calendar.
Look at the Outdoor Condenser Unit
The condenser sits on a concrete pad outside your house. It needs clear airflow to dump heat.
First, turn off the power at the breaker. Then pull back any vegetation, leaves, or debris that may be covering the coils.
Check the fan blades for bends or cracks. A bent blade can reduce airflow by up to 30 percent.
Give the coil a gentle rinse with a garden hose. Use a low-pressure spray to avoid bending the fins.
- Keep at least two feet of clearance around the unit.
- Trim bushes back to a height of three feet.
- Schedule a professional cleaning once a year.
Assess Refrigerant Levels and Leaks
Low refrigerant is a common cause of warm air. The system still runs, but without enough refrigerant the evaporator cannot absorb heat.
Only a certified and insured technician can measure refrigerant pressure safely. If the pressure is low, the technician will look for a leak.
Leak locations can include soldered joints, service ports, or the coil itself. Finding a leak often requires a special detector.
Repair costs vary. A typical refrigerant leak repair runs $400-$900 plus the cost of the refrigerant, which is $125-$225 per pound.
Examine the Blower Motor and Fan
The blower motor pushes air across the evaporator coil. If the motor is weak or the fan belt is slipping, airflow drops.
Listen for a humming sound when the system starts. A high-pitched squeal often means the belt is worn.
Turn off the power and inspect the belt for cracks. If it looks frayed, replace it.
Motor replacement costs range from $450-$1,200 depending on the type. Variable-speed ECM motors sit at the high end.
When to Call a Professional
If you have gone through the steps above and still feel warm air, it’s time to call a local tech.
Common reasons to call include a refrigerant leak, a failed compressor, or a malfunctioning capacitor.
A service call and diagnostic usually costs $90-$150. Labor runs around $200 per hour.
We can also check the ductwork for leaks, test the system’s SEER rating, and advise on maintenance plans. Regular tune-ups keep the unit running efficiently and can lower your Entergy bill.
Our team in Kenner and Metairie is certified and insured. We can provide a free quote after a quick on-site inspection.
The Short Version
Start with the thermostat, then replace the air filter, and clear the outdoor unit. If those steps don’t fix the warm air, check for low refrigerant or a weak blower motor.
When you need a repair, expect a diagnostic fee of $90-$150 and labor around $200 per hour. Refrigerant work costs $125-$225 per pound plus $400-$900 for leak repair.
Tegridy Air offers certified and insured service for Kenner and Metairie homeowners. Call us or request a free quote online for a professional diagnosis.
Dealing with this right now? Call Tegridy Air at 504-414-8655 or request a free quote online – we’re local to Kenner and Metairie and we move fast.
Related Reading
- What AC Repair Actually Costs in Kenner – An Honest Breakdown
- How to Tame Heating & Cooling Costs in Kenner & Metairie
- Why One Room Is Hot: Fixing Uneven Cooling in Kenner Homes
Frequently Asked Questions
Why is my AC blowing warm air even though the thermostat says “cool”?
Warm air can result from a clogged filter, low refrigerant, a blocked outdoor unit, or a malfunctioning blower. Check the simple items first, then call a pro if the problem continues.
How often should I change my air filter in a hot climate like New Orleans?
Change the filter every 30-60 days during the cooling season. In homes that run the AC constantly, a monthly check is best.
Can I add refrigerant myself if I suspect a low-charge issue?
No. Adding refrigerant requires special equipment and certification. A certified and insured technician will measure the charge, locate any leaks, and add the correct amount safely.
What is the typical cost to replace a compressor in a central AC system?
Compressor replacement usually runs $1,800-$2,900 installed. The exact price depends on the unit size and model. A diagnostic visit will confirm if a replacement is needed.