If you live outside the Twin Cities metro—or anywhere natural gas lines don't reach—you've probably dealt with the propane question. Propane furnaces work just as well as natural gas models, but there are key differences in cost, installation, and efficiency that every rural Minnesota homeowner should understand before buying.
Natural Gas vs. Propane: The Core Differences
Both fuels power standard forced-air furnaces, but they're not interchangeable without a conversion. Here's how they compare for Minnesota homeowners:
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| Factor | Natural Gas | Propane (LP) |
|---|---|---|
| Availability | Urban/suburban only | Available anywhere |
| Energy content (BTU/cu ft) | ~1,020 BTU | ~2,516 BTU (2.5× denser) |
| 2026 avg. price/gallon equiv. | ~$0.80–$1.10/therm | ~$1.80–$2.60/gallon |
| Annual heating cost (2,000 sq ft home) | ~$900–$1,400 | ~$1,600–$2,400 |
| Tank required? | No (utility line) | Yes (250–1,000 gal) |
| Supply interruption risk | Low (utility grid) | Low if tank is full |
| Furnace purchase price | Same | Same (needs LP orifice kit) |
| Burn efficiency at high-altitude | Slightly affected | More consistent |
Bottom line: Natural gas is cheaper per BTU when available, but propane is your best option if you're rural—and it works just as reliably through a Minnesota winter.
Do I Need a Special Propane Furnace?
No—most Goodman furnaces are designed for natural gas but can be converted to propane using an LP conversion kit. The conversion changes the orifices (the small jets inside the burner assembly) to accommodate propane's higher BTU density. This is a standard process that any licensed HVAC tech can do, and it's often done at the factory when you order a propane-ready unit.
How to Order a Propane-Ready Furnace
When buying a furnace from Furnace Direct, simply specify that you need an LP (propane) unit. Our Goodman furnaces can be ordered with the LP conversion kit included or pre-installed. The process is straightforward:
- Choose your furnace model based on BTU output and AFUE rating
- Specify LP/propane fuel type at checkout or in your order notes
- A licensed HVAC technician installs the unit and connects it to your propane tank
- Tech verifies combustion and sets manifold pressure per LP specs (typically 10–11 inches W.C.)
Propane Tank Sizing for Minnesota Winters
Undersizing your tank is the #1 mistake rural homeowners make. Running out of propane in a Minnesota January is a genuine emergency. Here's a sizing guide:
| Home Size | Recommended Tank | Fill Frequency (avg MN winter) | Notes |
|---|---|---|---|
| Under 1,200 sq ft | 250–500 gal | 2–3× per season | May need more in extreme cold snaps |
| 1,200–2,000 sq ft | 500 gal | 2–3× per season | Add water heater usage to estimate |
| 2,000–3,000 sq ft | 500–1,000 gal | 2–4× per season | 1,000 gal = fewer fill trips |
| 3,000+ sq ft or very old home | 1,000 gal or dual tanks | 2–3× per season | Dual-tank setup keeps pressure stable |
| Any size + backup generator | Add 200–500 gal | — | Generator load adds significant usage |
Pro tip: Sign up for automatic delivery with your propane supplier. They track degree-days and refill your tank before it hits 20%. Never let it run below 15%—lines can lose pressure and you'll need a safety check-and-relight, which is a service call.
Propane Furnace Efficiency: Does AFUE Still Matter?
Yes—and it matters more with propane because the fuel costs more per BTU. The math is simple: upgrading from 80% AFUE to 96% AFUE saves 16 cents of every dollar you spend on propane. Over a $2,000/year propane heating bill, that's $320/year in savings. The upgrade typically pays for itself in 4–6 years.
| AFUE Rating | Annual Propane Cost (2,000 sq ft) | 10-Year Fuel Cost | vs. 80% AFUE Savings |
|---|---|---|---|
| 80% AFUE | ~$2,100 | ~$21,000 | Baseline |
| 92% AFUE | ~$1,830 | ~$18,300 | Save ~$2,700 |
| 96% AFUE | ~$1,750 | ~$17,500 | Save ~$3,500 |
| 96% + two-stage | ~$1,680 | ~$16,800 | Save ~$4,200 |
Propane Safety in Minnesota: What to Know
Propane is heavier than air—unlike natural gas, which rises and dissipates. This means a propane leak settles in low areas (basements, crawl spaces) and can accumulate to dangerous levels. Key safety rules for rural MN homes:
- Install a propane/CO detector near floor level in utility rooms and near sleeping areas
- Know where your shutoff valve is—it's at the tank. Turn it clockwise to close
- If you smell gas, leave immediately, don't flip any switches, and call your propane supplier from outside
- Annual inspection: Have a tech check the regulator, supply lines, and connections every year before heating season
- Outdoor tank clearances: Tanks must be at least 10 ft from structures; 1,000-gal tanks need 25 ft
Is Propane Right for My Rural Minnesota Home?
If natural gas isn't available at your property, propane is the most cost-effective and reliable heating fuel available. It's cleaner than fuel oil, cheaper than electric resistance heat, and delivers the same furnace performance as natural gas. The higher per-BTU cost compared to natural gas is simply the tradeoff for living off the utility grid—but a high-efficiency Goodman propane furnace minimizes that gap.
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