Why does my air conditioner make a noise? Causes and solutions

During periods of intense heat, air conditioners are our reliable allies, ensuring maximum comfort and letting us enjoy a cool, pleasant haven at home or in the office. 

However, when these guardians of coolness start making constant noise, the situation changes dramatically. How can we enjoy comfort when a persistent, annoying humming invades our space, disturbing the tranquillity we long for? 

In this article, we examine why the indoor units of our air conditioners make a noise, analyse the source of this unexpected issue, and see how we can resolve such problems.

What does this article cover?

• The noises your air conditioner makes and what they mean
• Causes of air conditioner noise
• Solutions
• What it means when the air conditioner's compressor makes a noise

The noises your air conditioner makes and what they mean

An air conditioner can produce a variety of sounds: from gentle humming, through to tapping or snapping. Each of these noises can indicate different issues depending on their source. 

A constant humming may indicate that the unit is operating normally. Unfortunately, some appliances are inherently noisy. So, next time, we suggest checking the appliance's noise level before purchasing to avoid any disturbance during your summer naps. However, if you’ve had your air conditioner for some time and the humming has only just started, it’s best to consult a professional. 

A tapping or mechanical noise may indicate a problem with the fan or its blades. Carefully listening and identifying the source of the sound is the first step towards diagnosing potential issues. 

Does your air conditioner make a noise? Here we'll tell you why

There are several reasons for air conditioner noise. Some of the most common causes include:

• Clogged filters: A buildup of dirt and dust can clog the filters, reducing airflow and causing noise. 

• Dirty fan: Dirt can also accumulate on the fan blades and other components. This not only affects performance, but can also cause unusual noises due to an imbalance in the system. Regularly cleaning these parts can prevent this type of noise. 

• Loose or worn components: Regular use can cause components to loosen or wear down, resulting in noise from movement or vibration.

• Temperature changes: Sudden temperature changes can cause internal parts of your air conditioner to expand and contract. These physical changes may cause creaking or banging noises, especially when the system is switched on or off after long periods of inactivity. 

• Broken blades: Broken or cracked fan blades in your air conditioner can affect rotation balance, causing unusual, annoying noises while also diminishing cooling efficiency. The noise may be a constant hum or a tapping sound, depending on the severity of the damage.

• Lodged objects: Outside objects like leaves, branches, or even small household items can sometimes become lodged in the air conditioner, particularly in the outdoor unit. These objects can disrupt the normal operation of the fan blades, causing scraping or tapping noises.  

• Dry bearing: Bearings enable the moving parts of your air conditioner, such as the fan motor, to turn smoothly. Over time, these bearings may lose lubrication, resulting in friction and unpleasant noise. 

How can I make the air conditioner less noisy?

To keep your air conditioner running quietly and efficiently, consider the following:

• Regular maintenance: Regular cleaning and inspections of the filters, blades, and other components can help prevent noise. 

• Correct installation: Make sure your air conditioner is properly installed and level. 

• Professional inspection: If you notice persistent or unusual noise, it’s best to call a certified professional for a thorough inspection.

What does it mean when the air conditioner's compressor makes a noise?

The compressor is a crucial part of your air conditioner, responsible for compressing the refrigerant and ensuring its circulation throughout the system. If this component starts making noise, it might indicate:

• Overload or failure: A compressor can become overloaded or fail due to incorrect refrigerant levels or leaks, resulting in noise.

• Wear: Like any mechanical component, wear and tear is inevitable and often manifests as noise. 

Noise from your air conditioner shouldn’t be ignored, as it could indicate problems that, if left unresolved, might cause major damage or increased energy consumption. Taking a proactive approach to maintenance and addressing any unusual noise promptly can help extend the lifespan of your climate control system, ensuring comfort and energy efficiency in your home or workplace. Remember, if in doubt, it’s always best to check with a professional.