What Causes Noisy Air Conditioning and Heating Vents?


Air conditioning and heating vents produce noise when the system’s fan is running, which is normal. However, if the noise is so loud it’s becoming concerning, it’s best to contact a residential furnace repair expert.

Here are some of the most common causes of noisy air vents.

Closed or Blocked Registers

Check if the supply and return registers are being obstructed by furniture, rugs or long curtains or drapes. Make sure that they’re open to allow air to circulate properly through the system.

Narrow Air Ducts 

Vents can make loud whooshing noises if the supply air ducts are too narrow. Debris can also block the ducts or cause one or more vents to close. You can use a flashlight to see if the vents look too dirty. However, you’ll need to reach out to an HVAC contractor if the noise persists. You can count on Dependable Heating & Air Conditioning for quality air conditioning and furnace maintenance services.

Dirty Air Filters

Dirty or clogged filters can cause high-pitched whistling sounds, as well as loud thumping noises. Another indication of clogged filters is rapid on-and-off cycling. Clogged filters should be replaced immediately, which is why we recommend checking your air filter regularly and cleaning or replacing it every three months to combat this problem.

Loose or Separated Duct Joints

Metal duct sections will rattle, clank and flap if duct joints get loose or separated. You can wrap loose sections with metal tape.

Debris in the Ductwork

Nails, screws, and other small items can fall through the slats in the registers. You may need professional assistance if you can’t reach the debris.

Whether you need home heating replacement or indoor comfort equipment, Dependable Heating & Air Conditioning is here to help. We’re your leading provider of quality HVAC products and services.