St. Clair is a Blue Earth County community south of Mankato with natural gas service. Here's what St. Clair homeowners pay for furnace replacement in 2025.
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| System | AFUE | Installed |
|---|---|---|
| Natural Gas Standard | 80% | $2,900–$3,700 |
| Natural Gas High-Efficiency | 96% | $3,600–$4,600 |
| Natural Gas Premium | 98% | $4,100–$5,100 |
Natural gas in St. Clair makes high-efficiency units pay back in 5–7 years through reduced fuel bills.
Top Goodman Models
The Goodman GCVC96 (96% AFUE, two-stage) is the top value pick for Blue Earth County homes. Furnace Direct delivers factory-direct. See North Mankato for Greater Mankato area pricing context.
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Furnace replacement cost St. Clair MN? $2,900–$5,100 installed.
Furnace Direct delivery? Yes—same-day to Blue Earth County.
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Tell us a little about your home and what you're replacing. We'll send real numbers on a Goodman 96% AFUE setup — shipped direct to your door anywhere in the lower 48. No contractor markup, no obligation.