Common AC Problems in Summer Heat/Humidity in Tennessee and Tips for Troubleshooting

Tennessee summers are known for their sweltering heat and stifling humidity, and your air conditioner plays a crucial role in keeping your home livable during those long, sticky months. If your air conditioner is struggling or acting up, there are a few common problems that could be to blame. 

Fortunately, some issues can be addressed with a bit of DIY troubleshooting. But others require the expertise of a licensed HVAC technician, and we’re here to help. Let’s explore the typical AC issues Tennessee homeowners face during the summer and how to tell whether it’s something you can fix or a sign to call us in.

1. AC Not Turning On

DIY troubleshooting tips:

• Check the thermostat: Make sure it’s set to “cool” and the temperature is below the current room temperature. Sometimes, the fix is as simple as replacing dead thermostat batteries.
• Inspect the circuit breaker: A tripped breaker can stop your system from powering on. Reset it if necessary and see if the system starts up again.
• When to call a pro: If your thermostat is working and the breaker isn’t tripped, but your AC still won’t turn on, you may be dealing with a faulty capacitor, wiring issue, or compressor failure—all of which require professional attention.

2. Weak or Warm Airflow from Vents

DIY troubleshooting tips:

• Replace or clean the air filter: A clogged filter restricts airflow and can make your AC run inefficiently or blow warm air.
• Check vents and registers: Ensure they’re open and not blocked by furniture, rugs, or curtains.
• Inspect the outdoor unit: Remove leaves, dirt, or debris that might be preventing proper heat exchange.
• When to call a pro: If you’ve addressed the above and your AC is still blowing warm or weak air, a refrigerant leak, frozen evaporator coil, or failing compressor could be the issue—none of which should be handled without a professional.

3. Strange Noises Coming From the System

DIY troubleshooting tips:

• Rattling or vibrations: Loose screws or panels may cause minor noises. Tightening them might do the trick.
• Clicking: Normal during startup or shutdown but constant clicking could indicate a relay issue.
• When to call a pro: Screeching, grinding, or banging sounds are more serious. These may point to a damaged motor, loose fan blade, or broken internal component. Turn the system off and schedule service to prevent further damage.

4. Humidity Not Being Controlled

DIY troubleshooting tips:

• Ensure the system is properly sized: Both undersized and oversized systems can struggle to remove humidity. The just-right size really makes a difference.
• Check for maintenance issues: Dirty coils or filters can limit the system’s dehumidifying capacity.
• When to call a pro: If your AC isn’t effectively reducing humidity, the issue could be related to low refrigerant, a malfunctioning compressor, or an undersized system. An HVAC technician can recommend a solution—whether it’s repair, maintenance, or adding a whole-home dehumidifier.

Since 1943, it’s been Automatic in Memphis! Contact the experts at Automatic Air Conditioning, Heating & Plumbing to get started on your next AC maintenance appointment.