How to Know When It’s Time to Replace Your Furnace
A reliable furnace is essential in Chilliwack and the surrounding Lower Mainland, where winters can be long and damp. But like all appliances, furnaces don’t last forever. At some point, repairs just aren’t enough, and replacement becomes the smarter, safer, and more cost-effective option.
Still, knowing exactly when to make that call isn’t always easy. You may not notice gradual changes in performance or rising energy bills until the system is already struggling.
In this post, we’ll walk you through the top signs that it’s time to replace your furnace, plus what you can expect during the process. If your heating system is acting up, this guide will help you make an informed decision before an emergency strikes.
1. Your Furnace Is Over 15 Years Old
The average furnace lasts between 15 and 20 years. If yours is nearing or past that range, it’s worth considering a replacement, even if it’s still working.
Older units may still run, but they lose efficiency and become more prone to breakdowns. Today’s high-efficiency furnaces are far more energy-efficient and environmentally friendly, meaning lower monthly bills and better performance.
If your furnace is over 15 years old and starting to show any of the signs below, it’s likely time to plan for a replacement.
2. Frequent Repairs
Every furnace needs a little maintenance now and then, but if you’re calling a technician every few months, something’s not right.
Frequent repairs often signal that the system is on its last legs. Instead of sinking more money into an outdated unit, it may be smarter to invest in a new, more efficient model. Not only will you save on service calls, but you’ll also get the peace of mind that comes with a dependable heating system.
A good rule of thumb: if your repair bills add up to 50% or more of the cost of a new unit, replacement is your best bet.
3. Rising Energy Bills
Have your heating bills crept up lately, even though your usage hasn’t changed? That’s a red flag.
Older furnaces naturally lose efficiency over time, especially if they haven’t been regularly serviced. This means your system uses more energy to produce the same amount of heat, and you end up paying for it.
Switching to a high-efficiency model with an AFUE (Annual Fuel Utilization Efficiency) rating of 90% or more can significantly reduce your energy costs and environmental footprint.
4. Uneven or Inconsistent Heating
Are some rooms in your house warm while others stay chilly? Do you notice drafts, hot spots, or a general inability to maintain a stable temperature?
These issues could point to problems with your ductwork, or a furnace that’s no longer distributing heat properly. While duct cleaning or sealing might help, persistent uneven heating is often a sign that the furnace can’t keep up with your home’s demands.
Modern systems offer improved airflow control, zoning options, and smart thermostat compatibility to deliver more even heating.
5. Strange Noises or Smells
A healthy furnace should run quietly and without any noticeable odours. If you hear banging, rattling, squealing, or notice odd smells, especially metallic, burning, or musty scents, it’s time to take action.
Some noises may indicate loose components or minor issues. But repeated or worsening sounds often point to mechanical failure, particularly in older units. Similarly, unpleasant smells could mean mold, combustion issues, or other hazards.
Don’t ignore the warning signs. A professional inspection can help you determine if repair or replacement is the right solution.
6. Excessive Dust or Dry Air
If your home feels stuffier, drier, or dustier than usual, your furnace might be the culprit. Older systems are less effective at filtering air and maintaining balanced humidity levels.
Excessive indoor air pollutants and dry air can affect your comfort and health, particularly if anyone in your home suffers from allergies or asthma.
Replacing your furnace with a modern model that integrates advanced filtration and humidity control can make a big difference in indoor air quality.
7. Yellow Pilot Light or Carbon Monoxide Risk
If your furnace uses a pilot light and it burns yellow instead of blue, that’s a serious concern. A yellow flame may indicate incomplete combustion and the potential for carbon monoxide buildup.
Carbon monoxide is colourless, odourless, and extremely dangerous. If you suspect a leak—or your carbon monoxide detector goes off, turn off your system immediately and call for professional help.
Upgrading to a sealed combustion furnace not only improves safety but also enhances efficiency and airflow.
8. Your Home’s Needs Have Changed
Sometimes it’s not the furnace that’s failing, it’s your home that’s evolved. If you’ve added square footage, finished a basement, or updated your insulation, your old system may no longer be the right size or capacity.
An undersized or outdated unit can struggle to keep up, driving up costs and reducing comfort. Replacing it with a properly sized, high-efficiency furnace ensures you get consistent, cost-effective heating throughout your home.
Plan Ahead—Before It Becomes an Emergency
No one wants to face a furnace failure during a cold snap. Replacing your furnace on your terms, rather than in an emergency, means more time to choose the right model, evaluate your options, and schedule the installation at your convenience.
At Cohesive Mechanical, we provide expert advice, transparent pricing, and trusted service to help you make the best decision for your home. Our experienced technicians handle everything from assessment to installation with care and precision.If you’re noticing the signs above, contact us today to schedule a furnace evaluation and explore your replacement options. We’ll help you stay warm, efficient, and worry-free for years to come.