Air Conditioner Not Cooling? Here’s What to Check

When your air conditioner isn’t cooling your home properly, it can be frustrating—especially during the hottest months. Before calling for professional HVAC service, follow these troubleshooting steps to identify and potentially resolve the issue.

Basic Troubleshooting Steps



1. Check the Thermostat Settings

• Ensure your thermostat is set to COOL mode.
• Make sure the temperature is set lower than the current room temperature.
• If your system has a FAN setting, switch it to AUTO to allow the AC to cycle properly.

2. Adjust the Temperature

• Lower the thermostat to its lowest setting and listen for the system to turn on.
• If the AC doesn’t start, there may be an issue with the power supply or components.

3. Inspect the Air Filter

• A clogged or dirty air filter can restrict airflow, reducing cooling efficiency.
• If the filter is dirty, replace it with a new one to improve air circulation.

4. Check Air Vents and Registers

• Ensure all air registers and vents are fully open and unblocked by furniture, curtains, or other objects.
• Obstructed vents can lead to reduced cooling and uneven temperatures.

5. Verify Power Supply

• Inspect the outdoor unit’s disconnect switch to ensure it’s turned on.
• Check your home’s circuit breaker or fuse box for any tripped breakers or blown fuses.
• Reset the breaker if necessary and see if the system restarts.

6. Examine the Outdoor Unit

• Make sure the condenser unit outside is free from debris such as leaves, dirt, or grass.
• A clogged condenser coil can reduce cooling efficiency.

Still Not Cooling? Call the Experts!

If your air conditioner still isn’t working after these checks, there may be a refrigerant leak, faulty compressor, or electrical issue that requires professional attention.