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Atlantic Refrigeration and Air Conditioning, Inc. Blog

Those Weird Furnace Noises Explained


Your furnace is reliable, always there when you need it, and you barely notice it’s on. That is, until it starts making a ton of noise.

Once your furnace makes itself known through excessive (and unsettling) noise, that’s when it’s usually time to call for furnace repair in Sussex County, DE.

Let’s walk you through some of these sounds and what they mean so you can be prepared for anything that comes your way.

Light Chirping or Tweeting Sounds

Your blower sends air through your vents. Once your furnace heats air, it’s sent to the blower, but your blower can run into one big problem that results in a chirping sound: it grinds against the mounting plate.

In many cases, the mounting plate simply comes loose and needs to be tightened to solve the issue. If the chirping sound persists, additional damage may have occurred that requires replacing several parts.

Quiet Repetitive Clicking

Clicking indicates a problem with your heat exchanger. If you’re not already aware of what this is, it’s the area in your furnace that deals with harmful gases. It funnels them outside through your exhaust and away from your home.

If your heat exchanger is cracked, it may produce a clicking sound. This means carbon monoxide is leaking into your home. It may leak at levels too low for your carbon monoxide detector to catch, but these levels are still harmful to your health.

We can’t stress enough that this is not an issue you should tackle on your own. You should always contact professionals to turn your furnace off and replace the heat exchanger. We have the tools, experience, and safety equipment necessary to handle these issues.

High-Pitched Wailing or Screeching

Any time you hear a high-pitched wailing or whining noise from your furnace, it’s a bad sign. What you’re hearing is metal scraping against metal.

Metal components are meant to work in tandem, but there’s lubricant between them to prevent screeching. When that lubrication dries up, you get that awful sound.

The friction and heat of metal grinding against metal will quickly degrade multiple components in your furnace. It’s a sign that something’s really wrong, and needs to be taken care of immediately.

Abrupt Banging Sound

It’s quiet, and then … BANG. You hear a loud sound that comes from the vents or the area where your furnace is located.

There are standard operational banging sounds. This happens from metal expanding and contracting due to the sudden heat when you turn your furnace on.

However, you’re probably already used to that happening. It’s when you hear a banging sound that doesn’t sound like when you just turn your furnace on that you have to worry.

It’s Time to Fix That Furnace

Is your furnace making any of the sounds we mentioned? Try to turn everything off in your house and just listen for a little while.

If you hear any of these noises, it’s time for professional repair. Let’s avoid a complete furnace breakdown and maintain your family’s level of comfort.

Contact Atlantic Refrigeration & Air Conditioning, Inc. today to schedule furnace repair as soon as possible to get your furnace back on track.

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