Signs It Is Time To Replace Your Furnace


The return of the colder winter months can bring about unpredictable weather conditions that may leave you feeling bluer than before. From blustery snowstorms to extremely cold, rainy days that are just downright miserable, feeling warm and cozy in the comfort of your home is crucial.

Yet if the gas or electric furnace you have at home is struggling to generate enough heat to keep you feeling comfortable during the winter months, it may be time for you to consider getting a replacement. 

Sometimes, issues surrounding a furnace can be resolved with a simple quick fix from a knowledgeable professional in this field. Yet other times, more drastic measures may need to be taken. The key here is knowing exactly if and when a replacement is required. 

If you’re not sure what to look out for or are unsure of whether you need a replacement furnace, this article will tell you everything you need to know!

Your Home Is Heated Unevenly

Have you ever stopped and noticed that particular areas of your home are much colder than others, despite having your furnace switched on? Yes? Well, it’s a surefire sign that your furnace is on its last legs!

If your furnace is heating your home unevenly then you will not be reaping the benefits of the heat, nor will the system be performing its function correctly. This is especially common in furnaces that are a lot older as they will struggle to generate and push out enough heat to warm up an entire room.

If you need to purchase a replacement furnace but aren’t sure how much it will cost, check out for more information.

You Are Experiencing Poor Air Quality

Toward the end of your furnace’s life, you may begin to notice that the air quality in your home has worsened. If this is true, there will likely be far more dust and additional harmful particles being easily distributed throughout your home.

Some of the more obvious signs that you are beginning to struggle with lower indoor air quality include dry skin and hair, exacerbated allergies, continuous coughing and sneezing, and bouts of fatigue. 

If this is the case, you need to replace your furnace as quickly as possible!

You’re Making Frequent Repairs

Let’s say you’re driving around an older car and it’s continuing to fall apart, or require frequent part replacements. In this case, you likely wouldn’t hesitate to fork out the additional money to find a replacement vehicle as you could be putting your and others’ safety at risk.

A furnace is no different.

If you’ve noticed that your furnace requires far more repairs than normal, and it’s also over the age of 15, it might be high time that you think about getting a replacement. Keeping a furnace way past its usefulness may do considerably more harm than good!

Your Furnace Is Over 15 Years Old

Like many other appliances in your home, a furnace has a generic lifespan. Gas systems can usually last for around 15 years, while electric systems are set for about 20 years. So, if you’ve officially had your furnace for anywhere between 15 and 20 years, it might be the best possible time to replace it.

Not only will it save you a considerable amount in terms of repair bills and energy use, but it will also create a more efficient heating system within your home.

Your Furnace Is Starting To Look Different

Your furnace was probably shiny and new when you first had it installed. But as the years have passed by, it’s likely lost all of that and has instead begun to showcase extreme signs of wear and tear. This will immediately indicate that you need a new furnace.

Some of the most common changes to keep an eye out for include:

  • Cracks: these can form in a furnace due to issues with the heat exchanger or extensive rusting. All cracks in a furnace – regardless of location or size – are a major cause for concern.
  • Rust: furnaces can easily rust in areas where the metal is directly exposed to combustion gases. Rust can begin to weaken the furnace structure over time and cracks may develop, which increases the risk of leaks occurring. 
  • Streaks of Soot: soot typically forms as a direct result of incomplete combustion, meaning the furnace produces high carbon monoxide levels. Keeping on top of cleaning and maintenance will do wonders to help resolve this issue.

Your Heating Bill Has Increased

Old or damaged furnaces that are neither effective nor efficient, and will likely end up costing you far more to run than a replacement. Make sure to scan through your bills to see if you can notice a trend in the price increase from the previous year or two.

Even the smallest of differences could make a huge deal. If you notice a difference in the price of at least 10% then it may be time to have the furnace thoroughly checked or, in the worst cases, completely replaced.

Your Furnace Flames Are Yellow Instead of Blue

A well-maintained furnace will always produce bright blue flames which indicate an efficient and safe combustion process. A furnace with yellow flames either means that there is an imbalance in the overall amount of gas and oxygen being used in the furnace. 

In worst-case scenarios, it might even indicate that a gas leak has occurred. It’s in your best interests to have an HVAC expert on hand so they can come in to diagnose the issue and also show you the best course of action to go about fixing it.

Your Furnace Is Making Strange Noises

Your furnace is also not in good condition if it is making some strange and unidentifiable noises. You will often be able to work out the root of the issue from the type of sound that the furnace makes.

  • Boom: If your furnace is emitting sounds that resemble small explosions, this will usually be due to issues with gas emissions. If you also notice a lingering gas smell after the sound, the furnace must be immediately checked.
  • Clicking: This indicates an issue with the flame sensor or igniter.
  • Humming: It’s common for a motor to produce a low humming noise. If you notice that it is beginning to get a lot louder, it’s a clear sign that your furnace needs to be replaced.
  • Popping: This noise tends to come from many different parts of the furnace. These usually occur as the temperature fluctuates.
  • Rattling: A rattling noise is produced by the movement of a loose part within the furnace. 
  • Rumbling: A furnace might begin to make a rumbling sound at the exact moment that the fuel ignites or as the air begins to travel through the ducts. However, if the rumble is loud and persistent, it might be a big sign that an issue is occurring either with the ignition system or with the burner.
  • Screeching: Screeching signals that a major part of the furnace has suffered damage. This is usually either the pulley, belt, or blower motor.


These are the main signs that show it is time to replace your furnace. However, you are not limited simply to these things. 

For instance, if you notice something slightly odd or simply feel that something is not right, it may be best for you to contact an expert to get their opinion about whether the issue can be fixed, or if a replacement furnace is needed.

After all, it’s better to be safe than sorry!