You have brought an Air conditioner into your house to enhance the comfort and luxury level of your lifestyle and not get irritated by the unwanted sounds coming from the vents. In this article, we will discuss the causes behind this phenomenon and elaborate on the possible solutions regarding the scratching sound. The sounds coming from your system serve as a signal of something bad happening to your device. Keep reading this article if you want to fix the issue of scratching sounds with your vents.
scratching sound in air vent

Scratching Sound In Air Vent - The Pertinent Causes

It is not very difficult to identify the issue you are crying in your system with the help of the sounds coming out of it. But we will recommend our readers get professional assistance to get rid of the issue properly and timely. You will hear several sounds from your system at some places during its regular use. The most common among them are given as follows:

  • Humming
  • Hissing
  • Scratching
  • Clicking
  • Knocking and Creaking

If you notice any of these sounds coming from your air conditioning system, we recommend you call a professional to analyze your system and fix it as per the system's requirements.

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scratching sound in air vent

The Blocked Vents

It's important to make sure all vent outlets are clear because when moving some furniture around your home, you may move and block or pinch the system's vents. It can slow down the air conditioning in your home and damage the HVAC system, and you may also notice unusual noises due to obstructed airflow and pressure in the system.

Dirty Air Filters

The frequency of changing air filters usually depends on your area and the density of your home or commercial or residential building. Remember that you should not rely on changing or cleaning these filters for more than two to three months.

If you don't clean and maintain the filters, so much dirt can build up in the drain that the filters can even become completely clogged. If you don't clean the filters, you might hear some knocking, buzzing, or whistling noises.

Damaged Air Duct

If you've heard unusual noises coming from your air vents, it's a sign that the ductwork is experiencing serious failure. Loose component joints can also cause a rattling or scraping sound. To fix them temporarily, you can use metal tape, but you should contact a professional to get the repair done as soon as possible.

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Stranded debris

Another reason your air vents make rattling, humming, and knocking noises when the air blows are various debris gets stuck in the ducts. You can solve this problem by cleaning the air filters. If the problem persists, seek professional help.

Leakage Of Refrigerants

The most annoying noises you will hear from ducts are hissing and falling. The possible reason behind this is refrigerant leakage, which is also extremely dangerous for your family's health and the environment.

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When an air conditioner's compressor leaks, it makes the same sound. If the compressor leaks, this is a serious malfunction. So if you hear the above noise, shut down the system and contact a professional technician.

Problems In Electrical Control System

If the clicking sound is listened to while turning your on and off your system, there is nothing to worry about. But if you are listening to a continuous clicking sound, there is a problem that requires a timely solution.

A clicking sound might indicate a problem with the electrical supply that professional experts should fix.

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The motor is having problems

If there is a problem with the motor, you may hear different sounds depending on the type of component that has the problem. If you hear a knocking and rattling sound, this indicates some loose parts in the ducts. At the same time, a screeching sound means that there is some problem with the worn belt or motor bearing.

Bad Compressor

The compressor is the component whose damage should be repaired as soon as possible. It can be stressed or overloaded, so don't put off repairs with squeaking, hissing, and buzzing sounds.

Frequently Asked Questions

Why does it sound like something's in my vent?

If you often hear whistling or roaring sounds from your air vents, it means that the airflow in the vent is too high or the volume damper inside the vent is temporarily closed or restricting normal airflow in some way. Is. Most homeowners often block vents in empty rooms, so they don't have to spend money to heat or cool the space.

Why do I hear crackling in my vent?

Does your home vent make a distinct popping or tinny sound every time you run your heater? This is because the vanes are expanding or contracting according to the temperature change.

How do you get an animal out of a vent?

By using the following steps, you can easily get an animal out of your air vent:

  • First, you must turn off your air conditioner and turn the squirrel or another animal into a crispy critter.
  • Contact pet control immediately.
  • You can use a net to trap the animal.

How do I stop my air ducts from popping?

You can solve the problem this problem in these ways:

  1. If you wrap your air ducts with insulation, this will help reduce duct noise on cold mornings.
  2. Another way to reduce the popping sound from the duct is to replace it. But generally, it is more cost-effective than their insulation.

Final Words

To summarize the whole discussion, we can conclude that if your air vent supply sounds like whistling or roaring, it means that there is too much airflow in the vent or volume inside the vent, or the damper is partially blocked. But if the vent sounds slightly popping, it's due to the vents expanding or contracting as the temperature changes.

Most homeowners close vents in empty rooms to save on cooling or heating electricity costs. If your air vents often smell ammonia, that's the smell of rat urine.


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