The furnace is too noisy - How to Fix?

Homeowners won’t be happy if their furnace starts being noisy one day. We can assure you this noise is the sign of a serious breakdown. There are several reasons your furnace could be disrupting you. Clogged filters restrict airflow in your furnace. Restricted airflow can generate a whistling sound. If the whistling is a recent noise you’ve never heard before, trying turning off your furnace and removing the furnace filter. If it is clogged with dirt and dust, it should be cleaned or replaced. When you turn the furnace back on – with the fresh filter in place – listen closely for any whistling sounds. There’s a good chance replacing the filter fixed the issue. If the whistling stops as soon as you take the doors off the furnace, it may have gone away just because you've opened up the unit and relieved the suction that was being created. If you can’t find any other cause for the noise, it could be a sign that your ducts are improperly sized; your furnace wants a greater flow of air. In some cases, an old unit may be weak and allow the motor to sort of bounce as it runs. You may be able to place a sturdy piece of styrofoam under the squirrel cage to stop this, but if the bearings themselves are the culprit, you may need to call a professional. If you believe the noise is coming from the furnace’s motor, this may be due to “bouncing.” You may be able to alleviate this bouncing by placing a sturdy piece of Styrofoam under the squirrel cage. However, if the bearings are worn out, you may need to call in an HVAC specialist. Never try any internal DIY furnace repairs as it is risky for your safety.