Why Is My AC Not Blowing Cold Air? Here’s What Might Be Going On

It’s a hot summer day in Idaho Falls. You turn on your AC… but instead of that refreshing blast of cool air, you get lukewarm disappointment. If you’re wondering, why is my AC not blowing cold air, you’re not alone—and you’ve come to the right place.

Let’s walk through the most common reasons your system might be struggling—and what to do next.

1. Your Thermostat Isn’t Set Properly

Sounds simple, but it happens all the time. Check to make sure your thermostat is set to “cool” and not “fan” or “heat.” Also, double-check the temperature setting to make sure it’s lower than the current room temperature.

2. The Air Filter Is Dirty or Clogged

A clogged filter blocks airflow and can cause your AC to freeze up or overheat. This restricts your system from cooling your home properly. Try changing the air filter—it’s cheap, quick, and often solves the problem.

Pro tip: Replace your filter every 1–3 months, depending on usage.

3. Your Outdoor Unit Is Blocked or Dirty

Head outside and take a look at your condenser unit. If it’s covered in leaves, dirt, or debris, it can’t do its job. Gently clear away any buildup and make sure there’s at least two feet of open space around it for airflow.

4. The Refrigerant Might Be Low

Low refrigerant = no cold air. This could mean you have a leak somewhere, which is a more serious issue. If you hear hissing noises or notice ice on the refrigerant line, call a professional right away.

5. The Evaporator Coil Is Frozen

If your AC has been running constantly, it can sometimes freeze up—especially if the filter is dirty or there’s a problem with the airflow. Turn off the system and let it thaw completely before turning it back on.

6. The Circuit Breaker Tripped

If your AC’s indoor or outdoor unit isn’t getting power, it won’t cool properly. Check your circuit panel and reset any tripped breakers. But if it happens again, don’t keep flipping the switch—call us to take a closer look.

7. The Compressor Isn’t Working

The compressor is like the heart of your AC system. If it’s damaged or failing, your system won’t cool no matter what. This usually requires professional repair or replacement.

8. Your AC Is Too Old

If your unit is more than 10–15 years old, it might just be time. Older systems lose efficiency, break down more often, and don’t cool as well—even when everything seems “fine.” A newer model could save you money in the long run.

Check out AC installation options if your system is nearing the end of its life.

What to Do Next

If your AC still isn’t blowing cold air after checking the basics, it’s time to call the pros. Our team at Sermon Service & Electric is ready to:

• Diagnose the problem fast

• Provide honest repair options

• Offer same-day service (when available)

• Help with financing if repairs are major

Schedule a diagnostic today and we’ll help you get back to cool in no time.

Don’t Wait Until It Gets Worse

A system that isn’t blowing cold air is usually trying to tell you something. Waiting too long could turn a simple fix into a costly repair.

Let’s catch it early—and keep your home comfortable all summer long.