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There’s a Whistling Noise Coming From My Ductwork

When dirt and dust collect in your filter or ductwork, these blockages can make strange noises. Your first step: check your air filter. Here's where to start investigating.

Why Your Ducts Are Whistling

Your handyman might whistle while he works — your ductwork shouldn't. If your heating and cooling system is starting to screech and howl, it might be time to clean or change your system's filter.

Potential Issues

  • whistling noise from the ductwork

A furnace is a “forced-air” system that works by distributing heat via ductwork and an air handler. Without that airflow distribution, your system cannot work properly and you will experience inconsistent temperatures or poor airflow distribution in your home. If you are experiencing low airflow from your air vents, there may be a problem with your furnace or ductwork that will need to be inspected by a professional.


  • whistling noise from the ductwork
  • furnace keeps turning on and off
  • home is unusually dirty
  • AC keeps turning on and off

In order to properly provide hot/cold airflow in your home, the HVAC filter needs to be clear of debris to let air pass through. Over time, the filter on your heating and cooling system collects dirt and dust. You must clean the filters on a regular basis to keep the air in your home and your system running efficiently.

  • indoor allergens
  • puddle around the indoor air conditioning unit
  • high electricity bills
  • whistling noise from the ductwork
  • pockets of cold air

A well-designed AC system should provide a consistent temperature between rooms. Each room in your home has specific airflow needs that are calculated in CFM (cubic feet per minute). If your air ducts are leaking, each room is not getting the proper CFM of airflow. Cool air will escape through the leak, which means that your AC will need to run longer, raising energy bills to meet the demands of each room.

Let's Get It Fixed!

Our virtual experts can diagnose your issue (for free!) and resolve simple problems.

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