7 Practical Ways to Reduce Air Conditioning Noise

  • Case Studies
  • 17 - 02 - 2021
  • By Climaterite
Ways to Reduce Air Conditioning Noise

Place to install Air Conditioner

You must install your new air conditioner in the right location. An air conditioner installation specialist will be able to guide you in the right direction. Based on your needs, the type of property and the environment, the specialist will help you choose the best location for the unit to ensure that it operates in an energy efficient manner. In addition to these requirements, you will need to ensure that the noise emitted by your air conditioner unit does not cause a nuisance to nearby residents. Check the layout of your property and any regulatory guidelines that apply to your property to ensure you have made the right installation decision.

Avoid Reflecting Surface

It is best to avoid installing outdoor air conditioning units near reflective surfaces. Sound waves will bounce off surfaces and travel further than expected if an acoustic barrier is not installed. Avoid installing outdoor units near walls and eaves. The outdoor unit should be positioned near surfaces that absorb sound like wood and foam.

Acoustic Barrier

When an air conditioner unit is installed, the outdoor unit may emit a loud noise. Split systems, wall mounted units and evaporative coolers all have external condenser and motor units. To ensure that the noise does not become a nuisance to neighbours, it is common for properties to have an acoustic barrier installed around the AC outdoor unit. While this is not always common, best practice guidelines specify that fences, noise-cancelling barriers and compartments can help to shield the noise to an acceptable level. It is best to engage a qualified builder who has an acoustics specialisation to ensure the design of the barrier works effectively.

Air Conditioning Noises You should never Ignore

Given below are few examples of Air Conditioning noise you should never ignore.


Squealing sounds are caused by high internal pressures. Modern AC systems have a sensor that measures pressure levels. If the level exceeds the tolerance, the unit will switch off. If this occurs frequently, engage a technician to assess the unit. In some circumstances the parts may need to be replaced, or a new unit installed.


If your cooling system is not working effectively and you can hear a hissing sound, this is commonly linked to refrigerant leaks. Refrigerant is handled by qualified technicians and needs to be checked by a professional. Switch off the unit and ensure that you engage a specialist who will inspect the unit, replace any parts and re-gas the unit.


This sound is commonly associated with electrical faults. Electrical issues can be dangerous and should not be ignored. The entire system operates with electrical power so ensure that you switch off the unit and isolate the power. Engage a licensed technician to conduct a thorough inspection so that the issue can be fixed without any further delay.


This is not an uncommon noise. A rattling sound simply means that there is a loose part such as a fin, cover plate, screw or other adjustable component. If you are unsure about how to fix the problem, engage a specialist who can diagnose the problem, identify the root cause and with the right know-how and tools, effectively remedy the issue without voiding the AC unit’s warranty.


A constant clicking noise indicates either an electrical or mechanical fault. There may be electrical damage to the AC unit’s wiring, or the outdoor condenser unit may not be operating correctly. To avoid damaging the unit further, switch off the AC unit and isolate the power to avoid any consequential electrical interference.


If you hear this sound, stop using the AC unit. Engage a professional to conduct a thorough inspection of the unit so that the parts can be fixed. If the crankshaft has come loose, blade is damaged or parts are falling apart, it is important to ensure that you do not continue to use the system as further operation can damage the unit.


When you hear this sound, it means that there are loose parts. A serious problem will be if the outdoor fan is not rotating properly and is touching or hitting other parts. If that’s the case, stop using the unit and contact a professional. Avoid conducting DIY repairs on your AC system and engage a licensed technician who knows what to do and has the right tools.


A light humming noise is normal. However, if the humming noise becomes louder, changes to another sound or is not consistent, then this may be a sign that the AC unit is dirty or the parts are loose. A quick inspection can help you to identify loose screws or parts, or a clogged filter. If you need help with these tasks, engage a specialist to avoid breaching your warranty terms.


A whistling sound is not a good sign. This may indicate that refrigerant is leaking. Refrigerant is a toxic gas that must be handled by a professional. An air conditioner specialist will inspect the lines and ensure that all parts are in working order. If there is a refrigerant leak, the technician may need to replace parts and re-gas the unit to ensure it works to its optimum level.


A gurgling or bubbling noise is not pleasant. When the air conditioner operates, the condenser compresses heat from the outdoor air with the refrigerant to create a cool breeze. During this conversion process, moisture is created which is drained through a pipe. If the drain line is clogged or cracked, you will hear a gurgling sound.

Common Checks to fix AC Noise

Since you know what kind of noises should you avoid, let’s have a look at common checks to fix noises in Air Conditioner.

Noisy Fan

A noisy fan is caused by debris resting on the fan blades or shaft, an insecure fan blade that has come loose or debris interfering with the rotation of the fan blade in its housing. In addition, damaged blades, blades that have deteriorated due to poor maintenance or blades that are not the right type can cause noises to be emitted during operation. This can be easily resolved by cleaning the blade or replacing the blade with the right part.


An air conditioner contains a motor that operates continuously when active. This motor does need to be maintained and lubricated over time. We recommend a qualified technician apply lubricant to the motor to minimise humming and grinding noises. The technician will use the right type of oil that has a viscosity ideal for motors. If the problem persists, you may need to replace the motor and/or ancillary parts connected to the motor.

Loose Screws

During operation, an air conditioner will vibrate. This will cause parts to come loose over time, especially screws. It is important during the annual check up of the condition and performance of the unit that all screws are checked and tightened correctly with the right amount of torque. A specialist technician should be engaged who has the right tools and know-how to complete the task effectively.

Coil Fins

Clogged coil fins can cause the air conditioner unit to make noises. If the coil needs cleaning, use a vacuum cleaner on a low suction setting and clean the coil fins when the air conditioner power is off. Alternatively, a small old tooth brush or paintbrush will do the trick too. Make sure that dirt, dust and other debris have been removed. Do not use a rag with water. You should also straighten any bent fins, however we recommend you leave that to a professional.

Tips to remove Air Conditioning Noise by AC Experts

We provide comprehensive and reliable air conditioning service in broad locations of Melbourne including, FrankstonGeelongDandenong and Burwood. If you are looking for an expert technician to fix your air conditioning noise then give us a call at 03 9878 4158

2 Replies to “7 Practical Ways to Reduce Air Conditioning Noise”

  1. Thanks for this detailed description! The air conditioner in my house makes strange sounds like thwapping. It says in this article that it means that something is stuck in its blades. What do you think?

Write A Comment

Your email address will not be published. Required fields are marked *