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What Causes Your AC to Stop Cooling?

There’s nothing more frustrating than switching on your air conditioner only to realize it’s blowing warm air—or worse, nothing at all. When your home is heating up and the AC isn’t keeping up, it’s time to act fast. If you’re looking for professional AC repair in Black Forest, our team is here to help. But first, let’s take a look at what might be going on.

1. Dirty Air Filters

This is one of the most common and most preventable issues. When your air filter gets clogged with dust and debris, it restricts airflow. That means your system can’t circulate air effectively, and as a result, it may not cool your home properly. If it’s been a while since you changed the filter, start there. A fresh filter can make a big difference in how well your system cools.

2. Low Refrigerant Levels

Your AC relies on refrigerant to absorb heat from inside your home and transfer it outdoors. If your system is low on refrigerant due to a leak or improper installation, your AC can’t cool effectively. Signs of a refrigerant issue include warm air coming from the vents, ice on the evaporator coils, and hissing sounds near the unit. This is a job for the pros—refrigerant handling requires specialized tools and certification.

3. Faulty Thermostat

It may seem simple, but a malfunctioning thermostat can throw everything off. If your thermostat isn’t accurately reading the room temperature or isn’t communicating properly with your system, it could cause your AC to shut off too soon or not kick in at all. Try replacing the batteries or resetting the device. If that doesn’t work, let us take a look. In some cases, upgrading to a smart thermostat can improve overall comfort and efficiency. It’s a small change that can give you better control over your home’s cooling.

4. Frozen Evaporator Coils

When your AC runs constantly or has poor airflow, the evaporator coils can freeze. This ice build-up prevents the system from absorbing heat, so your home stays warm. You might notice water dripping around the indoor unit or a sudden loss of cooling. Turn the unit off and let it thaw, but make sure to call for service so we can determine what caused the freeze-up in the first place.

5. Electrical or Compressor Issues

Your AC system has several moving parts, and electrical issues—such as tripped breakers, blown fuses, or faulty wiring—can cause your system to shut down or stop cooling. A damaged compressor can also result in a total loss of cooling power. These problems usually require a trained technician to diagnose and repair safely.

Don’t Wait—Call the Pros

If your AC isn’t cooling, you don’t have to sweat it out. Robbins Heating & Air Conditioning has seen it all, and we know how to get your system back in shape. Whether it’s a simple fix or a more complex issue, we’re ready to respond quickly and effectively.

Robbins Heating & Air Conditioning serves Black Forest and the surrounding area. Contact us today!

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