Why Is My Heating System Making a Loud Noise?

A healthy furnace is a quiet furnace. Although it’s normal for your system to make a little noise during operation, the sound shouldn’t be more than a low hum. Unusual sounds like rattling or whistling are symptoms of heater problems. In fact, you can often troubleshoot what the problem is based on the specific sound the system is making.


When your furnace makes a rattling sound, it could mean that a panel is loose. Loose panels are easy to fix on your own with a screwdriver. Simply make sure all the screws holding the panel on are tightened correctly. If the rattling continues, it may be something more serious that should be evaluated by a professional. At Cota's Comfort Heating & Cooling, our repair technicians offer fast, reliable solutions in Seymour.


Whistling usually means there’s a problem with the duct. Small holes or gaps in the duct make a whistling sound when air is leaking through them. You can usually pinpoint where the gap is by listening for the sound’s point of origin. Occasionally, whistling is caused by a clogged filter. Simply swap out the filter to see if the whistling clears up.

Loud Booming or Banging

If you hear a sound like a gunshot when your furnace kicks on, there may be gas built up somewhere in the system. This can be a dangerous situation, so you should never ignore loud booming or banging sounds coming from the furnace. We recommend turning off your system immediately and calling us so we can do emergency repairs.

Furnace Repairs and More

Furnaces are capable of making an entire range of sounds, and the specific noise can tell you what’s wrong with the system. Some of these are easy fixes, like changing the furnace filter, while others are best left to the professionals. Cota's Comfort Heating & Cooling offers top-notch AC and heating services, including repairs, maintenance, and installation. Our goal is to help you stay happy and comfortable all winter long. Call us today to schedule an appointment.

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