Nothing feels worse than warm air coming from your AC on a Texas summer day.

If you’re expecting a cool breeze but get hot air instead, don’t panic; it’s one of the most common issues homeowners face. The good news? Most causes are simple to fix when you know where to look.

At Ductman AC, we help families across New Braunfels, San Antonio, and surrounding areas stay cool all year long.

Here’s what could be happening and how to solve it fast.

1. The Thermostat Isn’t Set Correctly

It might sound obvious, but always start here!

Check that your thermostat is set to “Cool” (not “Heat” or “Fan Only”) and the temperature is lower than the room temperature. If you have a smart thermostat, try rebooting it or changing the batteries; sometimes it just needs a quick reset.

2. Dirty Air Filters Are Blocking Airflow

When filters get clogged with dust and debris, your system can’t breathe. This causes weak airflow and makes your AC struggle, sometimes even blowing warm air.
👉 Replace your filters every 1–3 months, especially during heavy use in the Texas summer.

3. The Outdoor Unit Isn’t Running Properly

Step outside and check your condenser unit (the big box with a fan). If it’s covered in leaves, dirt, or debris, it can’t release heat efficiently.

Also, listen if the fan isn’t spinning or it’s unusually quiet, there could be an electrical or compressor issue that requires a professional inspection.

4. Low Refrigerant Levels

Refrigerant is what actually cools the air. If your system has a leak or is running low, it can’t absorb enough heat, resulting in warm air.

⚠️ Only certified HVAC technicians (like Ductman AC) can safely check and recharge refrigerant levels.

5. Electrical or Capacitor Issues

If your AC’s fan motor or capacitor fails, the outdoor unit won’t run properly, even if your indoor unit seems fine.

You may hear a humming sound, but no cooling happens. In that case, it’s time to schedule a professional diagnostic.

6. Clogged Condensate Line

Believe it or not, a clogged drain line can cause your system to shut down partially for safety reasons.

If you notice water pooling near your indoor unit, it might be time for a quick cleanout.

7. Time for Professional Maintenance

Sometimes, warm air is a symptom of long-term wear or lack of tune-ups.

Seasonal maintenance keeps your system efficient, prevents breakdowns, and ensures cool comfort when you need it most.

Fix It Fast with Ductman AC

If your AC is blowing warm air, don’t wait until it quits completely.
The experts at Ductman Air Conditioning & Heating are here to help with honest pricing, same-day service, and our 100% Satisfaction Guarantee.

📍 Serving New Braunfels, San Antonio, and nearby Texas areas
📞 Call today +1 (830) 261-4178 or schedule your service online Ductman AC