How to Fix a Noisy HVAC

Tori Klein • December 9, 2021

With more individuals working from their houses than ever before, it's never been more important to make certain your house is comfortable and has a quiet area to where you can focus.

Picture of a woman working from her laptop with her husband and daughter playing next to her.

 So, what do you do when it seems more like a runaway freight train than a HVAC system? Let's begin by taking a look at the noises you might be hearing with your cooling and heating system, the reasons you're hearing them, as well as just how to repair if it's too loud.



Whistling sound


If you're hearing a low whistling sound when your air conditioning is running that simply doesn't sound normal, it could be a sign that you have a problem. Here are some of the reasons and also how to fix it:


  • Registers or vents aren't secured correctly, and the air is displaced around the edges creating whistling audio. Tighten up or replace used registers or air vent covers.
  • Leaks are caused by openings or cracks in the duct. Contact an HVAC specialist for a ductwork evaluation.
  • Fan setups are incorrect-- If your fan settings are too high, it can overload the ductwork. Attempt changing the setting speed to a lower setup.
  • The air filter needs changing or cleaning-- clogged or dirty filters can produce sound and likewise make your system run less successfully. Make sure to change your filters consistently.



Loud squealing or screeching


  • Much like the shrilling noise your car makes when a belt malfunctions, the blower belt might be slipping or is just worn out.
  • Bearings in the motor might require lubricating-- this is generally done during routine maintenance however if you have not had a tune-up lately, your motor can loosen and also can sound like it's taking a beating. If you think of either of the above, consult an HVAC professional.


Rattling sounds


  • The Exterior unit isn't level-- when your unit isn't appropriately leveled, it can create a rattling sound.
  • Fan blades, bearings, or motor are worn-- if the audios seem to be originating from the air trainer or the follower motor, you'll want an HVAC pro to assess what the problem is.
  • Shut vents-- if you have actually got several vents shut, it can create noise as well as also require your system to function more difficult. Keep your vents open to make sure that air can be dispersed easily.
  • Ductwork needs cleaning-- dirt and debris can develop inside your ductwork hindering the air movement and triggering a rattling noise. Try to arrange to get your ducts cleaned routinely.


The best way to keep your heating and cooling system from being the loudest voice in your home is to stay on top of preventative upkeep. Being proactive can not only conserve your time as well as the stress of all that noise, but it can also save you money on pricey repairs down the road. Arrange your regular tune-up or maintenance service today by calling the experts at Best Owner Direct. We're dedicated to the interior quality of the air you and your family breathe every day.

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