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Why is My Furnace So Loud?

by VitalStorm Content on November 29, 2018

why is my furnace so loud

Is your furnace the thing going bump in the night at your house? Have you found yourself constantly asking, “Why is my furnace so loud?”

There are all sorts of odd noises furnaces make, and sometimes they can indicate problems you should address sooner rather than later. Here are a few common furnace problems that might make you listen.

Common Furnace Noises

Lots of furnaces are loud, but not all of them sound just alike. Some common furnace noises that could be driving you crazy include:

  • Scraping
  • Screeching
  • Humming
  • Rumbling
  • Thumping
  • Tapping
  • Popping
  • Banging
  • Rattling
  • Whistling

Is your furnace making any of these sounds? There are several possible reasons why. It is best to have your furnace assessed by a professional HVAC technician who can offer a proper solution. When you ask a professional “Why is my furnace so loud?” these are a few of the most common answers you will hear.

Loose Parts

If you hear a rattling noise coming from your furnace, it probably means one of two things: loose parts, or a faulty heat exchanger (which we will discuss below). Check for loose screws and covers first because it’s an easier fix. First, shut off the power to your furnace at the source so that you can handle it safely. Then simply tighten all screws and plates into place with a screw driver and enjoy the peace and quiet.

Faulty Heat Exchanger

If your furnace is rattling and you don’t find any loose parts, the most likely explanation is a faulty heat exchanger. Restricted airflow can easily cause a crack or leak in your heat exchanger because too much heat has built up over time. This is common for furnaces that have been neglected, so we urge our customers to schedule annual maintenance on their furnaces to prevent problems like these. A faulty heat exchanger is not a DIY fix. If you notice cracks in your heat exchanger, call an HVAC professional immediately.

Blower Motor

Have you heard rattling inside your furnace accompanied by a rough scraping or piercing screeching sound? This horrible sound bite could be coming from your furnace’s blower motor. Blower motors need frequent and specific lubrication to keep them functioning normally as they push the warmer air from your furnace into your ductwork. If you suspect your blower motor is the culprit behind your furnace noises, call a licensed HVAC company you can trust.

Damaged Blower Belt or Fan

If you hear a tapping or thumbing sound in your furnace, it might be something caught in your blower fan. These sounds or a squealing noise can indicate a problem with your blower belt. Turn off the power and look for damage or debris. If you find that your blower belt is loose or damaged, an HVAC technician will need to replace it. If not, you may just need routine lubrication maintenance to keep the mechanical parts of your furnace from becoming too dry as they work together.

Have you found yourself wondering, “Why is my furnace so loud?”

If your furnace doesn’t sound right, schedule an inspection with a NATE-certified technician at Blue Flame. We can help you assess what’s wrong with your furnace and repair it right away. Give us a call today for on time, professional service!

At Blue Flame, we are committed to an exceptional and eco-friendly experience every time you use our heating, air conditioning, and electrical services. Call us at (206) 388-5667 and speak to a member of our team.