​​Unusual HVAC Noises to Watch Out For

Does your HVAC system sound like a plane that is about to take off? Or is it making a lot of loud banging noises? All HVAC systems make noises; however, it’s important to distinguish between good and bad ones since certain sounds can indicate that something is wrong with your HVAC system and that HVAC repair NYC NJ is required.

Normal HVAC Sounds

The sounds that are coming from your HVAC system should blend into the background. All HVAC systems make sounds when they turn on, off, and while they are running. Here are some common “safe” sounds that you may hear from your HVAC system:


When your HVAC system turns on, it will make a clicking sound followed by a noise that is best described as an airplane taking off. This is the result of the many moving parts in your unit jumping into motion and is considered normal until the humming becomes loud and doesn’t stop. In that case, you’ll need HVAC repair NYC NJ.

Gentle Blowing

The gentle blowing of air is to be expected from an HVAC system, as an AC unit operates by blowing cooled air through the ducts and vents of your home. This noise, however, should be quiet enough to fade into the background.


When your HVAC system cycles off, it will make several clicking sounds (that should last for a few seconds), similar to the sounds it makes when it turns on. However, if the clicking doesn’t stop or is extremely loud, there may be something stuck in the fan.

Problematic HVAC Sounds

Here are several dangerous HVAC system sounds to look out for:


If your AC unit is buzzing, it is usually not a good sign. When HVAC systems buzz, it might be because the motor isn’t running properly, there is debris in the system, or a fan blade is loose. In addition, this could mean that the condenser coil is dirty or that you have an electrical issue.

Banging or Rattling

Are you hearing banging or rattling noises from your AC unit? Banging and rattling noises can occur as a result of a loose screw or other components. This issue should be addressed immediately, since the component in question may be fully dislodged, causing a bigger issue down the line.


If you hear gurgling or bubbling sounds coming from your HVAC system, you may have a refrigerant leak. Because refrigerant contains chemicals that can be deadly if inhaled, a refrigerant leak can be extremely dangerous to your health.


Hissing noises can be another sign of a refrigerant leak or indicate that the compressor is faulty. Both are serious issues that should be taken care of by a professional HVAC technician as soon as possible.


Is your HVAC system producing pig-like noises? Squealing is usually an indication that a component, such as the blower wheel, fan motor, or belt needs to be replaced. Fortunately, a professional can quickly resolve this issue. It could also mean that high pressure is building up somewhere in your unit and is struggling to escape, which can be extremely dangerous! Turn off your AC unit immediately and call a professional technician for HVAC repair NYC NJ.


If your AC unit is making a whistling or low humming sound, it could signify that your ducts or air vents are blocked or that your filter is dirty and needs to be replaced. Both of these issues are quick fixes, and will either require a professional duct cleaning or air filter replacement. Another possibility is that a seal in the unit is loose or damaged and needs to be repaired.

When to Call an HVAC Technician?

Although this may seem obvious, you should call a professional HVAC technician for HVAC repair NYC NJ as soon as you notice strange noises emanating from your AC unit. Hearing odd noises usually indicates that there is some type of issue with your HVAC system that will only worsen if ignored. It’s better to call a professional HVAC technician sooner rather than later to avoid replacing the entire system. Another reason your HVAC system may be creating so much noise is because of its age. Have you had your current HVAC system for more than ten years? If so, it may be time to replace it. You can be assured that newer models are quieter and far more efficient. If you’re hearing strange noises coming from your HVAC system, you can always reach out to Quick Pro Serve for HVAC repairs! Our purpose is to keep you comfortable all year long and to ensure that your HVAC system is in good working order.

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