Minnesota's heating costs vary significantly by location. Duluth, on Lake Superior in northern Minnesota, has dramatically more heating degree days than Rochester in the southeast. Understanding your city's climate data helps you make better furnace efficiency and sizing decisions. Here's a breakdown of heating costs by major Minnesota city.
Heating Degree Days by Minnesota City
Heating Degree Days (HDD) measure the cumulative demand for heating energy. Each day's HDD is calculated as 65°F minus the average outdoor temperature for that day (if positive). More HDD = more heating required = higher gas bills.
| City | Annual HDD (65°F base) | Design Winter Temp | Climate Zone |
|---|---|---|---|
| Duluth | ~10,000 HDD | -22°F | Zone 7 |
| International Falls | ~10,600 HDD | -36°F | Zone 7 |
| St. Cloud | ~8,800 HDD | -22°F | Zone 6 |
| Minneapolis / St. Paul | ~8,000 HDD | -16°F | Zone 6 |
| Rochester | ~7,800 HDD | -16°F | Zone 6 |
| Mankato | ~7,500 HDD | -16°F | Zone 6 |
Estimated Annual Heating Costs by City
For a 2,000 sq ft average home with average insulation, on natural gas at approximately $1.00/therm (approximate 2026 MN average):
| City | 80% AFUE Furnace | 96% AFUE Furnace | Annual Savings (96% vs 80%) |
|---|---|---|---|
| Duluth | ~$1,650/yr | ~$1,375/yr | ~$275/yr |
| International Falls | ~$1,750/yr | ~$1,460/yr | ~$290/yr |
| St. Cloud | ~$1,450/yr | ~$1,210/yr | ~$240/yr |
| Minneapolis / St. Paul | ~$1,320/yr | ~$1,100/yr | ~$220/yr |
| Rochester | ~$1,285/yr | ~$1,070/yr | ~$215/yr |
| Mankato | ~$1,235/yr | ~$1,030/yr | ~$205/yr |
Estimates based on average home size, insulation, and thermostat settings. Actual costs vary significantly by home characteristics and utility rates.
What This Means for Furnace Efficiency Decisions
Duluth and northern Minnesota homeowners benefit most from high-efficiency furnaces — the longer heating season and colder design temperatures mean faster payback on the premium for 96% vs. 80% AFUE equipment. A Duluth homeowner saves ~$275/year vs. ~$220/year in the Twin Cities — meaning a Duluth homeowner recoups the efficiency premium in 3–4 years vs. 4–5 years in Minneapolis.
For Duluth and northern Minnesota: strongly consider 96% or 98% AFUE — the math is very favorable. For Twin Cities metro: 96% AFUE remains the right choice for most homeowners. For Rochester and southern Minnesota: 96% AFUE is still the right call given Minnesota's code requirements and reasonable payback periods. See our full guide on AFUE explained and Minnesota furnace installation costs.
Propane Users: The Efficiency Premium Is Even Higher
If you're heating with propane (common in rural Minnesota), the efficiency payback is even faster because propane costs 2–3x more per BTU than natural gas. See our guide on propane vs. natural gas cost comparison and propane furnaces for rural Minnesota.
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