The #1 Reason Your AC Isn’t Cooling Properly in Charleston’s Humid Summer
If your air conditioner is running but your home still feels hot and muggy, you’re not alone. Charleston’s high heat and coastal humidity can put a major strain on your cooling system—and one issue we see time and time again is the #1 reason your AC isn’t cooling properly: a dirty or clogged air filter.
Why Your Air Filter Matters More Than You Think
Your AC system relies on proper airflow to function efficiently. When your air filter gets clogged with dust, pollen, pet hair, or other debris, it blocks that airflow—making your system work harder while cooling less effectively. In Charleston, this problem is even more common during the summer months when:
- Pollen levels are high
- Pet shedding increases indoors
- Humidity causes filters to trap more moisture and debris
- AC systems are running almost nonstop
A dirty filter doesn’t just reduce cooling—it can also cause your coils to freeze, reduce energy efficiency, and even shorten the life of your system.
Signs Your Filter Is the Problem
Not sure if your filter is the culprit? Here are a few red flags to watch for:
- Warm air blowing from vents
- Weak airflow in certain rooms
- Higher-than-usual energy bills
- AC running constantly but not reaching set temperature
- Increased indoor humidity
How Often Should You Change It?
In Charleston’s climate, we recommend checking your filter once a month during the peak cooling season (May through September). You may need to change it more frequently if:
- You have pets
- You live near construction or marsh areas
- You suffer from allergies
- Your AC runs constantly
Don’t Let a Simple Fix Turn Into a Costly Repair
At Terrace Heating & Air, we see it all the time—a customer calls us for what seems like a serious AC problem, and it turns out the solution is as easy as replacing the air filter. That’s why routine maintenance is key to keeping your system running efficiently all summer long.
Need Help With Your Cooling System in Charleston?
If your AC still isn’t cooling after changing the filter, there could be a more complex issue—like low refrigerant, dirty coils, or a failing compressor. The experts at Terrace Heating & Air are here to help with fast, friendly service across the Charleston area. Contact us today to schedule a service visit or sign up for a preventive maintenance plan—and keep your cool all summer long.


