Furnaces, boilers, heat pumps — no HVAC system operates in complete silence. That’s not necessarily a bad thing. There’s something comforting about the quiet hum of warm air blowing through the vents on a cold winter’s night. Certain sounds, on the other hand, signal it’s time to take action. If you hear any of the following noises, you might need an HVAC system repair.

Whistling or Hissing Noises

Here’s the good news: a filter change might be all it takes to stop your system from making hissing or whistling sounds. The sound you hear comes from the air whistling around a clogged filter. The fix might be simple, but the problem is still serious. An obstructed filter can drive up your energy bills as the system runs overtime to draw in enough air. A persistent whistling noise can also indicate the unit is pulling exhaust gases into your home. Contact a qualified technician to identify the underlying issue.

Rattles and Bangs

It’s normal for ductwork to make an occasional ping or ding as the metal surfaces contract and expand due to temperature changes. Loud rattles, thumps and bangs are something else altogether. A loud racket indicates a motor bearing or other component within the blower has come loose. If the sound repeats at quick intervals, chances are something inside the blower is hitting the fan blades as they spin.

Screeching or Squealing

If your HVAC system suddenly starts making very loud noises, don’t panic. It may sound like the system is about to fall apart, but that’s often not the case. There might be a bad belt, or the motor might need lubricant. An expert service technician can help you keep a minor heating repair from turning into an unexpected replacement.

At Air Specialists Heating & Air Conditioning, Inc., we’re dedicated to providing HVAC systems with the attention they need to operate safely and reliably. For more information, check out our heating services or call us today.

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