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10 Reasons Your AC is not cooling in San Marcos, TX?

10 Reasons Your AC is not cooling in San Marcos, TX?

Posted on July 15, 2025 By rehan.rafique No Comments on 10 Reasons Your AC is not cooling in San Marcos, TX?

When your AC stops cooling in the middle of a San Marcos summer, it’s more than inconvenient, and it’s urgent. With temperatures soaring past 100°F, a struggling system can quickly turn your home in Blanco Gardens, La Cima, or Willow Creek into an oven. If your air conditioner is running but your house still feels hot and humid, something is not right, and ignoring the issue could lead to higher energy bills, costly damage, or even a total system breakdown.

If any of these issues sound familiar, it may be time to call for professional air conditioning service in San Marcos, TX, before the problem worsens. This guide breaks down the 10 most common reasons your AC isn’t cooling properly in San Marcos, TX, from simple fixes, such as dirty filters, to more serious issues, including refrigerant leaks or broken compressors.

Top Reasons for “ Why Your AC is not Cooling in San Marcos”

Top Reasons for “ Why Your AC is not Cooling in San Marcos” 

Before you panic or assume the worst, remember: not all common  AC problems require expensive repairs. In fact, many cooling issues in San Marcos homes are caused by overlooked maintenance or minor component failures, particularly during prolonged periods of heat and humidity. 

Why is my AC not cooling in San Marcos, TX?

That’s one of the most searched questions by homeowners each summer and for good reason. When your air conditioner fails during a Central Texas heatwave, the comfort of your home drops fast. Whether you’re in Blanco Gardens, La Cima, or near the Texas State campus, understanding the cause of the issue can save you time, stress, and money. Here are 10 of the most common AC not cooling reasons faced by San Marcos homeowners and what you can do next.

A Clogged Air Filter Might Be Choking Your Airflow.

When filters become clogged with dust, pet hair, or Texas pollen, your system can’t function properly. This blocks clogged filters from warming air reaching the evaporator coil, meaning your AC won’t cool efficiently or at all. Left unchecked, it can even freeze the coil and shut down your system. During allergy season or dry spells when dust is high, check your filters every 30 days. It’s one of the easiest forms of HVAC troubleshooting that can instantly improve airflow.

Low Refrigerant Is Another Top Reason Your AC Blows Warm Air.

If your unit is low on refrigerant, it won’t absorb and release heat correctly, making cooling nearly impossible. You might see ice on the lines or hear a hissing sound if there’s a leak. Refrigerant issues aren’t DIY fixes, they need a certified technician for safe repair and recharge. If your home isn’t cooling despite the unit running, this is a common culprit in our region.

Dirty Coils Can Destroy Your System’s Efficiency.

Both your indoor evaporator coil and outdoor condenser coil must be clean to function correctly. When covered in grime, grass, or even mold, they block heat transfer. Your AC runs longer, works harder, and your utility bills skyrocket. The intense humidity in San Marcos accelerates the growth of dirt on coils, making regular maintenance a must, especially before and after summer.

Your Thermostat Could Be Sending the Wrong Signals.

Sometimes it’s not the AC unit, it’s the brain controlling it. A malfunctioning thermostat may misread room temperature, resulting in cycles that are too short or systems that fail to turn on at all. Before scheduling AC repair services in San Marcos, try resetting it, replacing the batteries, or upgrading to a smart model. If the problem persists, internal wiring may need inspection.

A Failing Compressor Means No Cooling Power at All.

The compressor is the engine of your AC. If it fails, you’ll likely feel warm air, hear loud clicking, or notice the outdoor unit isn’t working properly. This is a serious issue and often one of the more expensive repairs, especially if your unit is over 10 years old. Many HVAC repair companies in San Marcos, TX recommend system replacement if the compressor fails in an aging system.

A Broken Fan Can Leave Your AC Blowing Weak or No Air.

 Fans are responsible for circulating air across coils and through your ductwork. If the fan motor is burnt out or blades are damaged, you’ll get reduced airflow—or none at all. Sometimes you’ll notice a slow-spinning fan problems  or hear buzzing. Don’t attempt to force it on; call in a pro to avoid motor or capacitor damage.

Electrical Issues and Tripped Breakers Stop Your AC in Its Tracks.

If your thermostat issue is on but nothing else is working, check your breaker panel. A tripped circuit can cut power to your outdoor condenser. Flip it once to reset, but if it trips again, that’s a red flag. San Marcos homes, especially older ones in neighborhoods like Sunset Acres, may have outdated electrical wiring that struggles under modern HVAC loads. Don’t keep flipping the breaker—get a licensed technician to inspect it safely.

Leaky or Blocked Ductwork Could Be Cooling Your Attic Instead of Your Home.

 Even if your AC is running perfectly, poor ductwork can ruin its impact. Cracks, holes, or disconnected ducts leak cold air into crawlspaces, walls, or attics, leaving rooms hot and stuffy. You’ll pay more on your energy bill while still sweating in your living room. If certain rooms are much warmer than others, have your ducts inspected and sealed by a local HVAC professional.

San Marcos Heatwaves Push Your System to the Limit.

External temperature effect (San Marcos heatwaves) experiences when outdoor temps hit 105°F or more (as they often do), even a well-maintained system may struggle to cool your home below 75°F. That doesn’t mean your unit is broken, it means it’s at its maximum capacity. In these cases, use ceiling fans, draw blinds during the day, and avoid using heat-producing appliances. It also helps to make sure your unit is correctly sized for your home’s square footage and insulation levels.

Neglecting Seasonal AC Maintenance Leads to Bigger Issues.

Skipping your yearly AC tune-up is one of the most common causes of long-term cooling problems. Without regular maintenance, dirt builds up, refrigerant drops, and minor issues snowball into breakdowns, usually at the worst time. At Woods Comfort System, our Comfort Care Plus Plan makes it easy to stay ahead of problems with biannual checkups and priority service.

What Should You Do After Identifying the Problem?

If you’ve narrowed down why your AC isn’t cooling, don’t wait for things to get worse and Texas heat doesn’t take a break, and neither should your comfort. While some issues, like changing a clogged air filter or replacing thermostat batteries, are safe DIY fixes, problems like low refrigerant, electrical faults, or a failing compressor require trained expertise.

For San Marcos homeowners, the next step is straightforward, which is to know when to call a professional that understands the local climate and responds promptly. At Woods Comfort Systems, we specialize in air conditioning service in San Marcos, TX, with licensed technicians who arrive prepared to diagnose and fix issues the same day, so you’re not left sweating through another night.

  • Emergency AC repair availabl
  • Upfront pricing and honest recommendations
  •  Maintenance plans to help prevent future breakdowns

Don’t let a minor issue turn into a significant system failure. Know the Importance of regular maintenance and schedule your AC repair services in San Marcos today to get your home back to superb, clean comfort fast. 

Closing 

If your air conditioner still isn’t cooling after addressing these issues, it’s time to call in local experts. At Woods Comfort Systems, we provide responsive and reliable AC repair services in San Marcos, tailored to the specific needs of Texas homeowners.

We’ll inspect your filters, coils, wiring, refrigerant levels, and more, restoring your comfort with precision and care. Still wondering how air conditioning affects your indoor air quality? Don’t miss our guide on how AC Can Help Fight Allergies in San Marcos. Woods Comfort Systems is your go-to HVAC and plumbing company in San Marcos. Book your next air conditioning service in San Marcos, TX, today and enjoy comfort without compromise.

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