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When is it time to replace your furnace?

In every home’s life, someday there will be a time when you have time to bid farewell to a super warm friend – your furnace.

Before you start to get sad, let’s talk about how long a traditional furnace lasts. For most common furnaces, anywhere from 15 to 30 years is the norm. But in our experience, we believe once you hit the 15-year mark its time to start looking.

So you might be wondering, so how do I keep my furnace healthy and in shape. Well for starters, the type of fuel it uses is a big deal. Many homeowners choose to install a new electric furnace because they boast a long average lifespan of 20 – 30 years. On the other hand, a gas furnace is engineered with a lifespan of 15 – 20 years. Although new gas furnaces have a lower lifespan, they cost less money to operate when compared to new electric furnaces. In addition, gas furnaces are able to heat your home at a faster rate when compared to electric systems.

Some other tips that’ll keep your furnace in good spirits are continuously replacing dirty filters in your furnace, seal the windows and doors in your home and consider investing in a programmable thermostat.

What’s That Sound?

When your furnace is on its last legs, it will let you know. In fact, the noises your furnace makes can tell you a lot. Let’s go over some of the most common furnace noises and what they mean.


This is caused by fluctuations in temperature within your furnace.


A rattling sound may be caused by loose ducts or equipment.


This type of noise indicates a damaged furnace blower motor. However, it can also be caused by a damaged belt or pulley.


This is caused by the furnace’s blower motor. If it has become noticeably loud, then it’s time to invest in a new furnace.


This may be a sign of a problem with the flame sensor or an ignition issue.


This could be a severe gas emission issue with your furnace. This noise is often caused by a brief delay during the ignition process.

Do you have a question about a potential furnace problem? We’d love to help. Simply call your local Louisville or Lexington Dauenhauer, any hour.

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