Why Is My AC Making That Noise?

Air conditioners always make noise while running, but it’s a quiet drone that most people easily tune out. If your AC is making unusually loud noises, you probably need to get it looked at by a professional. Keep reading to learn the common causes of air conditioner noises and when to call a pro.

Don’t risk wearing out your system by delaying repairs. Heed the warning signs, and contact us to schedule your AC repair.

Common Causes of Strange Noises in AC Systems

The typical hum of operation and the occasional chirping are the only sounds your AC should be making. If your AC is making unusual noises, it’s a sign that something might be wrong. Here’s a breakdown of common sounds and what they might indicate:

Squealing: This often points to issues with the fan belt. It could be worn out or misaligned, which will need adjustment or replacement. Continuous squealing can also indicate motor bearings that need lubrication or replacement.

Clicking: Persistent clicking usually signals a problem with electrical components or the thermostat. This requires prompt attention to prevent further damage. Clicks at the start or end of a cooling cycle are normal, but continuous clicking is not and could be a sign of a failing relay or capacitor.

Buzzing: A buzzing sound can mean various issues, from loose parts and debris in the unit to electrical problems and failing components like the condenser fan motor. Buzzing can also indicate that the unit is not receiving enough voltage, which needs to be addressed by checking the electrical connections and components.

Rattling/Banging: These noises typically indicate loose or broken parts inside the AC. As components wear down, they can become dislodged, creating a rattling or banging sound. It could also mean that the fan is hitting other parts of the unit or that debris has entered the system.

Hissing/Bubbling: Hissing sounds often suggest a refrigerant leak, which can lead to decreased efficiency and higher energy bills. Bubbling noises can also point to issues within the refrigerant system, such as air entering the refrigerant line, which can reduce cooling performance.

Humming: Soft humming is normal, but loud humming can indicate low lubrication levels in the motor, contactor failure, or bent fin coils. It’s crucial to address these issues before they lead to more significant problems.

Whistling: Whistling noises often indicate air flow obstructions, such as dirty air filters or leaky ductwork. Ensuring that the ductwork is sealed and the filters are clean can prevent these issues.

Cracking: This noise can occur when the temperature is set too low, causing moisture not to drain correctly, or when the fins are clogged. Regular maintenance helps in preventing these issues.

Dangers of Ignoring These Noises

Ignoring unusual AC noises can lead to several risks and complications:

Increased Energy Bills: Malfunctioning components can cause your AC to work harder, leading to higher energy consumption and increased utility bills. Over time, the inefficiency adds up, resulting in significantly higher expenses than if the issue had been addressed promptly. Ignoring these sounds can strain your unit, causing it to consume more energy than necessary.

System Failure: Minor issues, if left unaddressed, can escalate into major problems that may cause complete system breakdowns, requiring costly repairs or replacements. Small problems like a loose component can lead to larger issues such as motor failure or compressor damage. Repairing these extensive damages can be far more expensive and time-consuming.

Safety Hazards: Electrical issues can pose serious safety risks, including electrical fires. It’s crucial to address any electrical noise immediately. Loose wires or malfunctioning electrical components can spark, creating a fire hazard. Immediate professional attention is necessary to ensure the safety of your home and family.

Reduced Air Quality: Problems like refrigerant leaks or dirty filters can compromise your indoor air quality, posing health risks to you and your family. Poor air quality can exacerbate respiratory issues, allergies, and other health problems. Maintaining clean filters and proper refrigerant levels is essential for healthy indoor air.

Decreased Lifespan: Running an AC unit with unresolved issues can significantly reduce its lifespan, leading to premature replacements. Regular maintenance and prompt repairs can extend the life of your unit, saving you money in the long run. Ignoring issues can cause wear and tear, reducing the system’s efficiency and overall longevity.

When To Call for Repair

In addition to the above noises, you should also call if you notice:

• Unpleasant smells coming from the AC
• Weak or inconsistent airflow
• Warm air blowing from the vents
• Uneven temperatures throughout your home
• Visible ice or frost on the unit
• AC cycling on and off frequently
• Difficulty maintaining the set temperature

Basically, anytime your AC acts strangely or doesn’t perform as well as it should, you need air conditioning repairs. You don’t want to regret putting it off after a small, fixable problem leads to significant damage or a system breakdown.

Step-by-Step Guide to Diagnosing AC Noises

1. Visual Inspection: Look for loose or damaged components, check fan blades for debris, and ensure the unit is free from obstructions.

2. Auditory Inspection: Identify the type and source of noise. Determine if the noise occurs during startup, operation, or shutdown.

3. DIY Checks: Tighten screws and bolts, remove debris from fan blades, and ensure no parts are vibrating against each other.

4. Professional Evaluation: If DIY checks do not resolve the issue, contact a professional HVAC technician for a thorough inspection and repair.

Preventive Maintenance Tips

Regular Cleaning: Keep the condenser coils clean to prevent high compressor pressure and reduce the likelihood of buzzing noises.

Check for Refrigerant Leaks: Have a professional inspect and recharge the refrigerant system if necessary.

Inspect Electrical Components: Ensure all wiring connections are secure to prevent clicking and buzzing noises caused by electrical faults.

Lubricate Moving Parts: Regularly lubricate motor bearings to prevent squealing and grinding noises.

Choose HVAC & Plumbing Unlimited for AC Repair

When your central AC, heat pump, ductless mini-split, or hybrid unit starts acting up, you need the expertise and years of experience that HVAC & Plumbing Unlimited’s top-class professional technicians bring to every job.

Our team of certified technicians specialize in diagnosing and fixing all types of AC issues efficiently. We stay updated with the latest technology and methods to ensure your system is running optimally. We service all makes and models, providing reliable solutions to keep your home comfortable.

Contact Us! If your AC is making strange noises or not performing as it should, contact HVAC & Plumbing Unlimited today. We’re here to provide expert AC repair and ensure your home stays cool and comfortable.