When it’s 90 degrees in Denham Springs and your vents start pushing out warm air instead of cool, it’s natural to wonder, “Why is my AC blowing warm air?” We hear that question pretty often at Summers Comfort Heating & Air—and believe me, you’re not the only one dealing with it. The good news is, we can help figure out what’s going wrong and get your cool air back fast.
There are several reasons why your air conditioner may suddenly stop cooling. Some issues are simple to fix, while others need a trained technician to take a closer look. Either way, we’ll walk you through the most common causes and what you can do next.
Thermostat Troubles: A Quick First Check
This might sound obvious, but always check the thermostat first. We’ve had more than a few calls where the thermostat was accidentally switched to “heat” or set to “fan only.” When it’s set to “fan,” the system will blow air—but not cool it.
Also, make sure you set the temperature lower than the current room temp. If someone in your house changed the settings, the system might blow warm air without you realizing it.
Clogged Filters Can Cause AC Blowing Warm Air
This is one of the most common problems we see around Livingston Parish—especially during allergy season. A dirty air filter restricts airflow, which leads to a drop in efficiency. Over time, your system has to work harder and may stop cooling altogether.
At Summers Comfort, we recommend checking your air filter monthly, especially if you have pets or live near a lot of trees and pollen. If the filter looks gray or dusty, replace it. This simple step can often prevent your AC blowing warm air in the first place.
Low Refrigerant: No Cool Air Without It
Refrigerant is the lifeblood of your AC system. It absorbs heat from inside your home and releases it outdoors. But if there’s a leak, your system can’t remove that heat—and your AC blows warm air instead.
Signs of low refrigerant include:
Ice on the outdoor unit or refrigerant lines
A hissing or bubbling noise
Long cooling cycles that never reach the desired temp
Refrigerant isn’t something you can just “top off” like gas in your car. If your system is leaking, we need to find and repair the source before adding more.
Electrical Issues or Outdoor Unit Failures
Sometimes, the indoor unit is running fine, but the outdoor condenser isn’t turning on. When that happens, the air handler just keeps circulating warm indoor air. You’d be surprised how many people call us thinking their AC is dead, but we often find a tripped breaker.
It could also be a blown capacitor, faulty contactor, or even wiring damage from weather or critters. If your breaker keeps tripping or the outside fan isn’t spinning, call us. We’ll take a look and get things working again.
Frozen Coils = AC Blowing Warm Air
Here’s something that confuses a lot of people: when your evaporator coils freeze, the system can’t pull heat from your home. That leads to—you guessed it—your AC blowing warm air.
Frozen coils are usually caused by:
Dirty filters
Blocked ducts or vents
Low refrigerant
A malfunctioning blower motor
You might notice reduced airflow, ice buildup, or a wet mess around the indoor unit. If that happens, shut the system off and give us a call. Continuing to run it could cause serious damage.
Ductwork Problems Can Disrupt Cooling
We’ve seen this more often in older homes across Denham Springs and Watson. If your ductwork has leaks or disconnects—especially in the attic—cool air escapes before reaching your vents. Instead, the system pulls warm air from the attic or crawlspace.
Not only does this lead to an AC blowing warm air, but it also wastes energy and drives up your utility bill. If you suspect your ductwork might be the problem, it’s worth having a professional take a closer look.
When to Call Summers Comfort Heating & Air
If you’ve gone through all the basics—checked the thermostat, changed the filter, looked at the breaker—and your AC is still blowing warm air, don’t wait too long to call for help. These issues rarely fix themselves. In fact, running a system that’s struggling can make things worse and more expensive.
At Summers Comfort Heating & Air, we’ve spent years helping homeowners in Denham Springs stay comfortable through Louisiana’s toughest heat waves. Our team knows the ins and outs of this climate—because we live in it too. From Denham Springs to Ponchatoula and Gonzalez, we bring expert care and reliable service to every home we visit.
Whether it’s a refrigerant issue, frozen coils, or electrical trouble, we’ll get to the root of the problem and walk you through the fix. We don’t just show up, toss in a part, and leave—we’ll explain what happened and help you avoid it in the future.
Still Dealing with Your AC Blowing Warm Air? We Can Help
There’s no good time to have your AC blowing warm air, especially in the middle of a Denham Springs summer. But the sooner you reach out for reliable AC repair, the faster we can help. At Summers Comfort Heating & Air, we keep your home cool, your system running efficiently, and your family comfortable.
Give us a call today, and let’s get your cool air flowing again.
