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Window AC Unit Making Noise? Heres How To Solve It

Window AC Unit Making Noise? Heres How To Reduce It

Are you bothered by the noise coming from your window air conditioner (AC)? If you find the hum or other noises discomforting, we have solutions to help you make your AC quieter. In this article, we have researched the reasons behind AC noise and compiled helpful steps to reduce it effectively.

Maintaining a comfortable indoor environment with minimal distractions from AC noise is crucial. Ignoring unusual sounds can lead to more significant problems with the internal components of the unit. To address this issue, we present a list of methods to make your window AC quieter.

Properly Position The AC

Ensure that the AC unit is not tilted and is centered correctly on the window. Loose screws may cause the AC cover to hit against the window, resulting in noise. Adjusting the position can help alleviate this issue.

Seal The Window

A gap between the AC unit and the window can create a low humming sound due to air pressure rushing through. You can resolve this problem by sealing the edges and corners of the window. Depending on the gap’s size, you can use a rubber strip or a suitable sealing material.

Window AC Unit Making Noise? Heres How To Reduce It

Check The Fan Blades And Motor

Inspect the fan blades for looseness and tighten them appropriately. Loose blades can contribute to AC noise during operation. Additionally, check if the blades are hitting any interior parts. If the blades are damaged or uneven, consider replacing them with new ones following the manufacturer’s instructions.

If blade replacement is necessary, follow these steps:

  • Disconnect the AC unit from power.
  • Remove the cover, starting from the corners.
  • Loosen and remove the old blade according to the user’s guide.
  • Install a new blade of the same type as your AC model, ensuring a secure fit.
  • Replace the cover and turn on the AC to test the noise reduction.

Also, inspect the motor. If the blade spins slower than usual, there may be motor damage. In such cases, it is advisable to seek professional assistance for motor repair or replacement. In extreme cases, you might need to consider replacing the entire AC unit.

Clean The AC

Regularly cleaning your AC can greatly improve its performance and reduce noise caused by accumulated dirt. Follow these steps to clean your AC without removing it from the window:

Window AC Unit Making Noise? Heres How To Reduce It
  • Detach the grill covering the motor and wash it with water and soap. Allow it to dry.
  • Spray a mixture of dishwashing liquid and water onto a soft cloth or rag. Wipe the external body of the AC.
  • Use a vacuum cleaner to remove dry dirt between the motor and other components.
  • Reattach the grill and start the AC to check for reduced noise levels.

Allow Your AC To Rest

Extended usage can lead to noisy operation due to exhausted motors. To alleviate this, periodically shut down your AC and allow it to rest. Consider using a ventilation fan after cooling the room to the desired temperature. This approach saves energy and promotes better air circulation.

Understanding The Causes Of AC Noise

To address AC noise effectively, it is essential to identify the underlying reasons. Here are some common causes of AC noise:

Ice Formation

  • Turn off the AC and let it sit for a few hours until the ice melts naturally.
  • Avoid scraping the ice off and instead wipe the interior with a soft cloth once the ice has melted.
  • Use an air dryer if needed to ensure the interior is completely dry.

Refrigerant Leak
Refrigerant leaks can cause air pressure to rush through and create a humming sound. If you suspect a refrigerant leak, consider replacing the gauge hoses or the refrigerant itself.

Tight Condenser Fan
A faulty condenser fan can produce a squeaky sound. Applying lubricant to the condenser fan motor can reduce friction and ensure smoother operation. Follow these steps to apply the lubricant:

  • Wear gloves and a mask before removing the cover.
  • Detach the condenser fan and place it on a carton for easier lubricant application.
  • Apply lubricant to the condenser fan motor and wipe off any excess.
  • Reinstall the condenser fan and test for noise reduction.

Knowing When To Replace Your AC Unit

Window AC Unit Making Noise? Heres How To Reduce It

While a noisy AC does not always necessitate immediate replacement, it can be an early sign of aging. Consider the following factors before deciding to replace your AC unit:

  1. Uncontrollable Temperature
    If you notice that your AC fails to change the temperature level as desired, a damaged thermostat motor may be the cause. Consult a technician to determine if a new thermostat is necessary before considering AC replacement.
  2. Weak Air Circulation
    If your AC is blowing air but with weak circulation, it indicates that the unit may have reached its limit. Check the fan capacitor responsible for air ventilation before considering a replacement.
  3. Burning Smell
    If you detect a burning smell inside your AC, disconnect it from power immediately. Overheating can cause internal wire melting and burning. Inspect the interior to locate the source of the smell and consult an expert if necessary. Consider using a scented air freshener to eliminate the odor temporarily.


By following the steps outlined in this article, you can effectively reduce the noise from your window AC unit. Cleaning, positioning, sealing gaps, and inspecting the fan blades and motor are key steps in achieving a quieter AC. Understanding the causes of AC noise and knowing when to consider a replacement will help you maintain a comfortable and noise-free indoor environment. Take action promptly to address any unusual noises and restore your AC to optimal functioning.

Window AC Unit Making Noise? Heres How To Reduce It

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