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| Square Footage | Furnace BTU |
|---|---|
| 1,000-1,200 sq. ft. Home | 40,000 - 60,000 BTU |
| 1,200-1,500 sq. ft. Home | 60,000 BTU |
| 1,500-1,800 sq. ft. Home | 60,000 - 80,000 BTU |
| 1,800-2,500 sq. ft. Home | 80,000 - 100,000 BTU |
| 2,500-3,500 sq. ft. Home | 100,000 to 120,000 BTU |
Calculate the estimated monthly operating cost of your furnace with this quick quiz.
AFUE = Annual Fuel Utilization Efficiency. Standard furnaces are ~80β85%, high-efficiency models are 95β98%.
Better insulation = your furnace works less = lower monthly cost.
Colder climates mean your furnace runs far more hours per heating season.
Check your gas bill for the rate per cubic metre (mΒ³). Average is around $1.20/mΒ³.
Our certified partners can quote a newer high-efficiency furnace that could cut your costs significantly.
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Important: This is a general estimate for informational purposes only. Your actual operating costs may vary based on thermostat settings, furnace age, local climate, and usage patterns.
These are estimates. Get precise quotes from certified contractors β for free.
GET FREE QUOTES| Home Size | Old 80% AFUE | New 95% AFUE | Annual Savings |
|---|---|---|---|
| Under 1,000 sq ft | $900 β $1,200/yr | $750 β $1,000/yr | ~$150/yr |
| 1,000 β 1,800 sq ft | $1,400 β $1,900/yr | $1,100 β $1,500/yr | ~$300/yr |
| 1,800 β 2,500 sq ft | $1,800 β $2,400/yr | $1,450 β $1,950/yr | ~$400/yr |
| 2,500+ sq ft | $2,400 β $3,200/yr | $1,900 β $2,600/yr | ~$550/yr |
| Province | Avg. Gas Rate (per GJ) | Avg. Annual Heating Cost |
|---|---|---|
| Ontario | $12β$16/GJ | $1,300 β $2,200 |
| Alberta | $8β$14/GJ | $1,100 β $1,900 |
| British Columbia | $11β$15/GJ | $900 β $1,600 |
| Quebec | $10β$14/GJ | $1,000 β $1,800 |
| Saskatchewan | $9β$13/GJ | $1,200 β $2,000 |
The formula is: (Furnace BTU/h Γ· AFUE) Γ Hours of Operation Γ Gas Rate per BTU. Our calculator does this math automatically. For example, a 100,000 BTU furnace at 95% AFUE running 8 hours/day at $0.38/mΒ³ costs approximately $3.20/day to operate.
As of 2025, the most efficient residential gas furnaces reach 98β98.7% AFUE. Top models include the Lennox SLP99V, Carrier Infinity 98, and Trane XV95. These use variable-speed blowers and condensing technology to minimize fuel waste.
Common causes include: a dirty air filter, an oversized or undersized furnace short-cycling, air leaks in the ductwork, inadequate insulation, extreme cold snaps, or a declining furnace efficiency due to age. Our troubleshooting wizard can help diagnose the issue.
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