Hearing weird noises from your AC? While some sounds are normal, others can signal serious problems that need immediate attention. Whether it's a hissing, screeching, rattling, or buzzing noise, ignoring these signs can lead to expensive breakdowns or system failure.
An air conditioner can produce unusual noises for several reasons. Common causes include a dirty air filter that restricts airflow, loose parts inside the unit, a malfunctioning fan motor, a refrigerant leak, worn bearings in the motor, damaged isolation feet, loose screws, clogged condenser coils, or problems with electrical components, such as a failing capacitor.
Common Causes of Strange AC Noises
1. Whistling or Whooshing Noise
This often occurs due to restricted airflow, commonly caused by dirty filters or blocked ducts.
Quick Fix:
Replace or clean the air filter.
Check vents and registers for blockages.
If the noise persists, your ducts may have leaks that need professional sealing.
2. Rattling or Clanking Noise
A rattling AC typically means a loose part inside the unit, such as screws, fan blades, or internal components.
Quick Fix:
Turn off the AC and tighten any loose screws.
Remove debris from around the outdoor unit.
If the rattling continues, a technician should inspect the blower or fan motor.
3. Buzzing or Vibrating Noise
Electrical issues, refrigerant leaks, or frozen evaporator coils can cause buzzing noises.
Quick Fix:
Turn off your AC and check for ice buildup on the coils.
If buzzing continues, shut down the system and call a professional to inspect for electrical faults or refrigerant leaks.
4. Screeching or Squealing Noise
These high-pitched noises usually indicate a worn-out belt, motor issues, or compressor failure.
Quick Fix:
If the squeal stops after startup, your compressor may be aging.
A continuous screeching noise likely points to motor issues—schedule an inspection ASAP.
5. Gurgling or Bubbling Noise
This sound often signals a refrigerant leak or improper condensation drainage.
Quick Fix:
Check if the AC drain line is clogged and clear any blockages.
If bubbling continues, have a technician inspect for refrigerant leaks.
6. Clicking or Ticking Noise
Clicking is normal at startup but can become a problem if it happens excessively.
Quick Fix:
Check your thermostat settings and battery.
If clicking continues before the unit turns on, your capacitor or relay switch may need replacing.
7. Banging or Thumping Noise
This is often a sign of a major issue inside the compressor or blower assembly.
Quick Fix:
Shut off the AC immediately to prevent further damage.
Call a professional to diagnose and repair any loose or broken parts inside the system.
Preventative Maintenance: How to Keep Your AC Quiet
Schedule regular tune-ups to prevent unexpected breakdowns.
Keep filters clean and replace them every 1-3 months.
Inspect your ductwork for leaks and insulation issues.
Ensure proper airflow by keeping vents open and unblocked.
Time to Call a Professional?
If your AC is making strange noises, and troubleshooting doesn't resolve the issue, it's time to bring in the experts. Some noises indicate serious electrical or mechanical failures that require immediate attention.
For reliable AC repair in Roswell, Sandy Springs, or Dunwoody, GA, contact The Air Company at 470-291-5423 or schedule an online appointment.
Don't wait until your AC breaks down—get expert help today!
