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Elliott-McElwee, Inc. Blog

What Hissing May Mean In Your Furnace


When you run your furnace, have you noticed that you hear some additional noise beneath the normal whoosh of air from the system? If this noise is like a hissing sound, then it may mean you need furnace repair in Egg Harbor Township. There is more than one problem that can cause a hissing noise in your furnace. The main thing to remember is that you should have a technician check out your system when you hear this noise no matter what because some of the issues causing it can be dangerous

When it comes to servicing your heating system, it is always best to go with a professional for your maintenance, repairs, and more. Let’s dive into the possible causes of a hissing heater so you know why it is so important to call in an expert ASAP.

3 Possible Causes For A Hissing Heater

If you have noticed that your furnace is hissing, it is worthwhile to get it checked. Chances are high that you need a repair. Here are the key issues that might be causing this problem.

  • Your air filter is clogged. never underestimate the importance of your HVAC system’s filter. If it becomes overly dirty, it can stifle the flow of air into your furnace. This can create a hissing sound, due to air forcing its way through the debris, and can also create major problems for the heating process. Filter changes should be made every one to three months to avoid this.
  • The ductwork in your home has a leak. When was the last time that you had your ductwork checked out? If it has been a few years and you’ve begun to hear a whistling or hissing noise in a certain part of your home, the source may be a leak in your ductwork. This is bad news for your system efficiency and your home comfort. Having a technician check out your ductwork allows them to find and address any holes or leaks that are causing problems.
  • Your furnace has a cracked heat exchanger. If you have a gas-powered furnace, a hissing noise may indicate that your system has a crack in the heat exchanger. The heat exchanger holds the combustion gases and allows heat to permeate through its metal to warm the air that is blown into your home. A crack in this component puts your home at risk of issues due to carbon monoxide exposure. If you hear a hissing noise combined with the scent of gas or feelings of dizziness, fatigue, or nausea, make sure to shut your system off and follow safety procedures before calling for repairs.

Whatever the source of the hissing noise, or any other concerning noise coming from your heater, it is always best to reach out to a professional for repairs. Only an expert technician has the necessary training to properly service this system without causing further damage or, worse, putting your home at risk.

Schedule your furnace repair with Elliott-McElwee, Inc. today. Your comfort is our business.

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