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What size furnace should I buy?

Square FootageFurnace BTU
1,000-1,200 sq. ft. Home40,000 - 60,000 BTU
1,200-1,500 sq. ft. Home60,000 BTU
1,500-1,800 sq. ft. Home60,000 - 80,000 BTU
1,800-2,500 sq. ft. Home80,000 - 100,000 BTU
2,500-3,500 sq. ft. Home100,000 to 120,000 BTU

Furnace Repair or Replace Quiz

Get a scored recommendation — should you fix your current furnace or replace it? Our quiz weighs age,
repair cost, efficiency, and reliability to give you a clear answer.
🔧 Scored Recommendation
💰 Cost Comparison
⏱️ 3 Minutes
🔧
Should You Repair or Replace Your Furnace?
Not sure whether to fix or replace your furnace? Answer a few quick questions and we’ll give you a personalized recommendation based on your situation.
How old is your current furnace?
How often has your furnace required service calls in the last few years?
Roughly how much have you spent on repairs in the last 3 years?
Is your furnace currently requiring repairs?
Is your furnace still under warranty?
Has your furnace been red-tagged or had carbon monoxide issues?
Are there any other significant issues with your furnace?
Select all that apply
Do your heating bills seem to have increased over previous heating seasons?
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Get a Free Furnace Quote

Connect with certified local HVAC contractors for a no-obligation estimate on repair or replacement.

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Should I Repair or Replace My Furnace?

The decision to repair or replace a furnace is one of the most common questions Canadian homeowners face. The answer depends on four key factors: the age of the furnace, the cost of the repair, the efficiency of the current unit, and the frequency of past breakdowns. Our quiz scores each factor and provides a weighted recommendation.

The 5,000 Rule (Industry Standard)

HVAC professionals often use the “5,000 Rule” as a quick guide: multiply your furnace’s age (in years) by the repair cost (in dollars). If the result exceeds $5,000, replacement is generally the more economical choice.
Scenario5,000 Rule ResultRecommendation
8-year-old furnace, $400 repair3,200✓ Repair
15-year-old furnace, $600 repair9,000✗ Replace
12-year-old furnace, $350 repair4,200✓ Repair (borderline)
18-year-old furnace, $800 repair14,400✗ Replace

Signs It’s Time to Replace Your Furnace

📅 Age Over 15 Years
Most furnaces have a lifespan of 15–25 years. After 15 years, efficiency degrades and breakdown frequency increases. Replacement prevents unexpected failures.
🔄 Frequent Repairs
If you’ve paid for two or more significant repairs in the past two years, the pattern will likely continue. Cumulative repair costs often exceed replacement cost.
📈 Rising Gas Bills
Unexplained increases in your heating bills despite normal usage often indicate declining furnace efficiency — a sign the heat exchanger or combustion system is degrading.
🌡️ Uneven Heating
If some rooms are too hot and others too cold, your furnace may no longer be able to distribute heat effectively — a sign of declining capacity or duct issues.
🔊 Unusual Noises
Banging, rattling, popping, or squealing often indicate cracked heat exchangers, failing blower motors, or worn belts — expensive repairs that may signal end-of-life.
⚠️ Yellow Burner Flame
A healthy furnace flame is blue. A yellow or orange flame can indicate excess carbon monoxide production — a safety hazard requiring immediate inspection.

When Repair Makes More Sense

Repair is usually the right choice when your furnace is less than 10 years old, the repair is a minor component (ignitor, pressure switch, thermocouple), the cost is under $500, and your heating bills haven’t been trending upward. A well-maintained furnace can last 20+ years, so protecting that investment with timely repairs makes good financial sense in the early years.

Frequently Asked Questions

How much does furnace repair cost in Canada?

Minor furnace repairs (ignitor, flame sensor, thermocouple) typically cost $150–$400 in Canada including labour. Mid-range repairs (blower motor, control board, gas valve) run $400–$800. Major repairs (heat exchanger, inducer motor) can cost $800–$1,500+. If a heat exchanger needs replacement, replacement of the whole furnace is almost always more economical.

No — a cracked heat exchanger is a serious carbon monoxide hazard and is almost never worth repairing. Replacement parts cost $500–$900 plus labour, and the underlying age/stress that caused the crack typically means other failures are coming. In virtually all cases, replacing the furnace is the right decision.

Standard home insurance in Canada does not cover mechanical breakdown of a furnace due to age or wear. Coverage may apply if the failure was caused by a covered peril (fire, flood, etc.). Some homeowners purchase appliance protection plans that cover heating equipment.

🇨🇦 Rebates Available
Canadian homeowners may qualify for up to
$5,000
in federal and provincial rebates on qualifying systems.
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