Wondering when to replace your furnace in Lethbridge? Most homeowners wait until the system fails in the middle of winter, but there are clear warning signs long before that point. Knowing when to upgrade can save you money and prevent a mid-season emergency.
Here’s how to know when your furnace is nearing the end of its lifespan.
1. Your Furnace Is 15–20+ Years Old
Most furnaces in Lethbridge last 15–20 years.
After that, parts wear down and efficiency drops.
General lifespan guide:
- 15–18 years: start planning
- 18–22 years: expect replacement
- 22+ years: system is on borrowed time
Age is the most reliable predictor of failure.
2. Repairs Are Becoming More Frequent
Occasional repairs are normal.
But if you’re calling for service every winter, the system is declining.
As a rule:
If repairs cost more than 25–30% of a new furnace, replacement is the smarter long-term move.
3. Heating Bills Keep Rising
Older furnaces lose efficiency over time.
If your energy bill keeps climbing without changes to usage, the system is working harder than it should.
A new high-efficiency furnace can cut heating costs by 20–30%.
4. Your Furnace Struggles in Cold Snaps
If your home feels cold even when the thermostat is set correctly, the furnace may not be producing enough heat.
Common culprits:
- Weak blower motor
- Failing burners
- Worn heat exchanger
- Furnace undersized for the home
These issues indicate it’s time to consider replacement.
5. Strange Noises or Smells
Banging, grinding, clicking, or metallic smells aren’t normal.
These may signal:
- Cracked heat exchanger
- Motor failure
- Ignition issues
- Gas problems
Don’t ignore warning signs — they often become safety issues.
Replacing Early Saves Money
When a furnace dies in mid-winter, you’re stuck with:
- No heat
- Limited equipment options
- After-hours or emergency labour rates
- Zero time to compare or plan
Replacing before failure gives you better pricing, better selection, and a smoother installation.
Top Notch Mechanical can size, install, and maintain the right furnace for your Lethbridge home.