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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 |
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Get Free Quotes| Old Furnace AFUE | New Furnace AFUE | Annual Savings (on $2,000/yr gas bill) | 10-Year Savings |
|---|---|---|---|
| 60% (pre-1990s) | 96% | ~$750/yr | ~$7,500 |
| 70% (1990s) | 96% | ~$542/yr | ~$5,420 |
| 80% (2000s) | 96% | ~$333/yr | ~$3,330 |
| 92% (2015+) | 96% | ~$83/yr | ~$830 |
For most Canadian homeowners spending $1,500–$3,000/year on gas heat, the upgrade saves $60–$120/year. Given the cost premium of ~$800–$1,500 for a higher AFUE model, payback is typically 10–15 years without rebates, or 5–8 years with rebates. For long-term homeowners in cold climates, it's usually worthwhile.
Check the yellow EnerGuide label on your furnace, look in the owner's manual, or search your furnace's model number online. Furnaces installed before 2000 are often 60–78% AFUE. Furnaces from 2000–2019 are typically 80–92% AFUE.
Not necessarily. Annual furnace tune-ups ($100–$200) can improve efficiency by 5–10%. Sealing air leaks and improving attic insulation often delivers better ROI than furnace replacement alone. Use our savings calculator to compare your options.
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