9 Reasons Your AC is Blowing Warm Air

ac blowing warm air

As a homeowner in the tri-state area, you know how crucial a working air conditioner (AC) is, especially during the sweltering summer months. Nothing is more frustrating than discovering your AC is blowing warm air. Understanding why this happens can help you address the issue promptly. Brackett Heating, Air & Plumbing is the leading provider of home comfort products and services in the tri-state area. To learn how Brackett can help you, too, contact our office today!

9 Commons Reasons Your AC is Blowing Warm Air

1. Thermostat Issues

Incorrect Settings

One of the simplest reasons your AC might be blowing warm air is because of incorrect thermostat settings. Check to ensure the thermostat is set to “cool” and the fan is set to “auto” rather than “on.” When the fan is on, it can blow air even when the AC isn’t cooling.

Low Battery

If your thermostat’s battery is low, it might not communicate with the AC system properly, causing your AC to blow warm air. Replace the batteries and see if that resolves the issue.


If you have a smart thermostat that loses connection with the AC unit, your AC might malfunction and blow warm air. Try rebooting your router to see if the connection can be restored. If the internet is active and you still have no connectivity, call Brackett to schedule an AC repair service

2. Dirty Air Filter

A dirty air filter can block airflow, causing your AC to struggle and blow warm air. It’s important to check and replace your air filter regularly, usually every 1-3 months, depending on usage and the type of filter.

Having regularly scheduled AC maintenance with Brackett Heating, Air & Plumbing ensures that your air filters are checked, cleaned, or replaced by your trained technician.  

3. Refrigerant Leak

Refrigerant is the substance that cools the air in your AC unit. If there’s a leak, the refrigerant levels will drop, and your AC won’t be able to cool the air effectively. You might notice a hissing sound or ice on the unit. A professionally trained Brackett HVAC technician can diagnose and repair a refrigerant leak.

4. Frozen Evaporator Coil

The evaporator coil absorbs heat from the air inside your home. If it freezes, it can’t do its job properly, leading to warm air blowing from your AC. Common causes of a frozen coil include dirty filters, blocked vents, or low refrigerant levels. If you know the filter is clean and no vents are blocked, schedule Brackett to check refrigerant levels for complete peace of mind.

5. Dirty Condenser Coils

The condenser coils are in the outdoor unit of your AC system. If they become dirty or clogged with debris, they can’t release heat effectively, causing your AC to blow warm air. Regular maintenance and cleaning can prevent this issue. Schedule yours with Brackett today.

6. Electrical Issues

Your AC system relies on various electrical components to function properly. Issues such as a tripped breaker, blown fuse, or faulty wiring can disrupt the system and cause it to blow warm air. If you suspect an electrical problem, it’s best to call a professional to inspect and repair it.

7. Compressor Problems

The compressor is the heart of your AC system, responsible for circulating refrigerant and cooling the air. If the compressor is malfunctioning or has failed, your AC won’t cool the air. Common signs of compressor problems include strange noises or the AC not turning on at all. A technician can diagnose and repair compressor issues.

8. Leaky Ducts

Ductwork carries cool air from your AC throughout your home. If there are leaks or gaps in the ducts, the cool air can escape, causing your AC to blow warm air. Inspect your ducts for any visible damage and seal any leaks with duct tape or mastic sealant. In some cases, professional duct sealing may be necessary.

9. Aging AC Unit

AC units typically last about 10-15 years. If your unit is nearing the end of its lifespan, it might struggle to cool your home effectively. Regular maintenance can extend the life of your AC, but eventually, replacement might be the best option to ensure efficient cooling. For a professional AC installation, Brackett Heating, Air & Plumbing is the only call you need to make.

AC Repair in Evansville, IN

If your AC is blowing warm air, it’s essential to identify and address the problem promptly to restore comfort to your home. Whether it’s a simple fix like changing the thermostat settings or a more complex issue like a refrigerant leak, knowing the possible causes can help you take the right steps. Regular maintenance and professional inspections can prevent many of these issues, ensuring your AC runs smoothly when you need it most. For residents of the tri-state area, staying proactive about AC care can make all the difference in keeping your home cool and comfortable all summer long.

All your AC repairs or installations and AC maintenance needs can be met by scheduling an appointment with a Brackett Heating, Air & Plumbing technician today.