Is Your Furnace Making Strange Noises? What It Could Mean & What to Do

When your furnace kicks on during a cold Pennsylvania or West Virginia winter night, it should be comforting—not concerning. But if your furnace is making strange noises, it could be trying to tell you something. From subtle rattles to loud bangs, unusual sounds can signal a variety of underlying issues.

At Van Bremen’s Heat & Air, we’ve helped countless homeowners get to the bottom of noisy furnace problems. Here’s what those sounds might mean—and what you should do next.

Common Furnace Noises and What They Mean

1. Banging or Popping

Possible Cause: This often happens when your ductwork expands and contracts due to temperature changes. However, if the noise is coming directly from the furnace, it could indicate delayed ignition in the burner—an issue that can be dangerous over time.

What to Do: Have one of our technicians inspect the burners and ignition system. Delayed ignition can crack the heat exchanger if left unresolved.

2. Squealing or Screeching

Possible Cause: A high-pitched squeal usually points to worn-out blower motor bearings or a frayed or loose fan belt.

What to Do: This type of issue typically requires professional attention. Our team can replace belts and lubricate or replace bearings to eliminate the noise and restore efficient operation.

3. Rattling

Possible Cause: Loose panels, screws, or internal components can create a rattling noise when the furnace is running. In more serious cases, it might indicate a cracked heat exchanger.

What to Do: Check to ensure the access panels are securely screwed in. If the rattling persists, give us a call—we’ll inspect for deeper issues that could affect safety and performance.

4. Clicking

Possible Cause: It’s normal to hear a few clicks when the furnace starts up. But continuous clicking could mean a faulty ignition system or a failing flame sensor.

What to Do: If your furnace won’t ignite or the clicking goes on for too long, it’s time for a professional inspection. Our team will test the ignitor, flame sensor, and control board to pinpoint the problem.

5. Booming

Possible Cause: A booming sound—especially on startup—can be a sign of gas buildup due to delayed ignition. This is not something to ignore.

What to Do: Turn off your system and contact Van Bremen’s immediately. We’ll safely inspect the burners, gas pressure, and ignition sequence to protect your home and family.

6. Humming or Buzzing

Possible Cause: While a low hum is usually normal, loud buzzing may indicate electrical issues such as a failing capacitor or loose wiring.

What to Do: Electrical components should only be handled by trained technicians. We’ll inspect and replace any damaged parts and ensure your system is safe and running smoothly.

7. Whistling

Possible Cause: A whistling noise often comes from restricted airflow—possibly due to a dirty air filter, closed vents, or improperly sized ductwork.

What to Do: Start by replacing your air filter. If the noise continues, our team can inspect the ductwork and airflow system to ensure proper balance and efficiency.

When to Call Van Bremen’s Heat & Air

Any unusual noise from your furnace should be treated as a warning sign. While some issues are minor, others—like gas buildup or electrical failure—can pose serious risks if ignored. At Van Bremen’s, we specialize in identifying the source of furnace noise quickly and providing long-lasting, safe repairs.

Keep Your Home Quiet, Warm & Safe

Don't let strange furnace sounds keep you up at night. Our licensed HVAC technicians are here to diagnose the issue, explain your options clearly, and get your system running quietly and efficiently again.

Hear Something Strange? Let’s Fix It Fast. Contact Van Bremen’s Heat & Air today at (814) 442-8618 or request service online. We proudly serve homeowners throughout Somerset, PA and Morgantown, WV with honest, dependable heating repairs you can trust.

Strange noises never fix themselves—call the team who can.