A 97% AFUE furnace costs $300–$800 more than a 95% AFUE model. Is that efficiency difference worth it for a Minnesota homeowner? Here's the actual math.
What AFUE Means in Dol lars
AFUE (Annual Fuel Utilization Efficiency) tells you what percentage of fuel becomes heat. A 95% AFUE furnace wastes 5 cents of every dollar of gas. A 97% AFUE furnace wastes 3 cents. The difference is 2 cents per dollar of gas burned.
The Payback Calculation
Average Minnesota home uses 800–1,000 therms of gas per year for heating. At $1.10/therm (2026 average):
| Scenario | Annual Gas Cost | 95% AFUE | 97% AFUE | Annual Savings |
|---|---|---|---|---|
| 800 therms/yr | $880 | $46.3 wasted | $27.8 wasted | ~$18/yr |
| 1,000 therms/yr | $1,100 | $57.9 wasted | $34.7 wasted | ~$23/yr |
| 1,200 therms/yr | $1,320 | $69.5 wasted | $41.6 wasted | ~$28/yr |
The Verdict
At $18–$28/year in savings, a $400 premium for 97% AFUE takes 14–22 years to pay back. Most furnaces last 15–20 years. That means in many cases, you'll never recoup the premium before replacement.
95% AFUE is the sweet spot for most Minnesota homeowners — you're already capturing the big efficiency gains over 80% AFUE (which saves $150–$200/year vs. 80%), and you're not paying a premium that doesn't pencil out.
When 97% AFUE Makes Sense
• You heat a very large home (2,500+ sq ft, 1,200+ therms/year) — savings approach $30–$40/year, better payback
• Gas prices in your area are significantly higher than average
• You plan to stay in the home 20+ years
• The price difference is under $200 (common when buying factory-direct)
Compare 95% and 97% AFUE Goodman furnaces side-by-side at Furnace Direct — factory-direct pricing to Minnesota.
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