Heating Oil vs. Natural Gas: Should You Convert?
About 5.7 million homes in the Northeast heat with oil. Every few years, when natural gas prices are low or a utility company runs gas lines into a neighborhood, many homeowners start asking the same question: should I convert?
The honest answer is: sometimes yes, sometimes no, and the math is more complicated than the utility salespeople usually present it. This guide gives you the full picture so you can make the call for your specific situation.
The Core Trade-Off
Converting from oil to natural gas involves a significant upfront cost — typically $4,000 to $8,000 for a standard residential conversion — in exchange for potentially lower annual fuel costs. Whether that trade-off is worth it depends on three things: how much you spend on heating today, the local price differential between gas and oil, and how long you plan to stay in the home.
What Conversion Actually Costs
The conversion cost includes several components, and the total varies significantly by home and situation:
- New gas furnace or boiler: $2,500–$4,500 for equipment and installation
- Gas service connection: The utility company runs a gas line to your meter. This can be subsidized or free if the utility is actively expanding service; otherwise $1,000–$3,000 depending on distance to the main
- Gas piping inside the home: Running pipe from the meter to the furnace location, $500–$1,500
- Oil tank removal: If your above-ground tank needs to be removed or an underground tank decommissioned, add $500–$2,500. Underground tank removal and soil testing can run significantly higher if contamination is found.
- Permits and inspections: $200–$500
Total realistic range: $4,000 to $10,000+ depending on your home's specific situation. Get multiple quotes. Conversion estimates vary significantly between contractors.
Subsidies exist: Several Northeast utility companies and state energy programs offer conversion rebates or subsidized connection fees — sometimes covering $1,000–$2,000 of the cost. Check with your state energy office and the local gas utility before getting quotes; available subsidies significantly change the math.
The Annual Savings Calculation
The key variable is the current price differential between natural gas and heating oil in your area. As a general rule of thumb:
A gallon of heating oil contains roughly the same BTU energy as 1.4 therms of natural gas. So to compare on a per-heat-unit basis: multiply your gas price (in dollars per therm) by 1.4. If that number is lower than your current oil price per gallon, gas is cheaper per unit of heat delivered.
Example: If natural gas in Connecticut is $1.50/therm and heating oil is $3.80/gallon: $1.50 × 1.4 = $2.10 effective oil-equivalent cost for gas. That's a 45% discount on fuel cost per BTU. For a home using 800 gallons of oil per year at $3.80 ($3,040/year), the comparable gas cost would be roughly $1,680/year — saving approximately $1,360/year. At that rate, a $6,000 conversion pays back in about 4.4 years.
But this math changes significantly with price movements. Natural gas prices have historically been more volatile than heating oil in certain years. The calculation that looks great in a year of cheap gas looks less compelling when gas prices spike. The difference between oil and gas prices fluctuates — some years gas has a large advantage, some years the gap narrows considerably.
The Arguments for Converting
- Lower fuel cost in most years: On average, natural gas has been cheaper per BTU than heating oil over the past decade in the Northeast. The long-run trend favors gas.
- No tank to worry about: Oil tanks have a finite life (20-25 years above ground, 15-20 years underground), require periodic inspection, and carry environmental liability if they leak. Gas eliminates the tank entirely.
- On-demand fuel: You never run out of natural gas. No delivery scheduling, no watching the gauge, no emergency call when you hit empty in January.
- Lower carbon intensity: Natural gas combustion produces roughly 30% less CO2 per BTU than heating oil. If this matters to you, it's a real difference.
- Gas appliance integration: Converting opens the option for gas cooking, gas water heating, gas clothes drying — potentially lowering costs across multiple appliances.
The Arguments Against Converting
- Large upfront cost: $4,000–$10,000 out of pocket, with a payback period of 4-8 years in typical scenarios. If you're planning to move in 3 years, the math doesn't work.
- Price volatility risk: Natural gas prices spiked dramatically in 2022 across North America, narrowing or eliminating the cost advantage over oil in that period. You're trading one commodity price risk for another.
- Rural and suburban access issues: Natural gas is simply not available in many Northeast communities — particularly rural CT, RI, Vermont, Maine, and New Hampshire. If the gas main doesn't pass near your street, conversion isn't an option regardless of price.
- New equipment may underperform old oil equipment: Modern high-efficiency oil furnaces (85–87% AFUE) or boilers are competitive in efficiency with mid-range gas equipment. If you're replacing a 30-year-old oil system that's reaching end of life, a new high-efficiency oil system is a legitimate alternative to conversion.
- Pipeline infrastructure concerns: Some homeowners have concerns about long-term natural gas infrastructure in the context of energy transition policies. This is a real consideration in some regulatory environments — check your state's energy policy direction.
Quick Comparison
| Factor | Heating Oil | Natural Gas |
|---|---|---|
| Upfront conversion cost | $0 (already installed) | $4,000–$10,000 |
| Annual fuel cost (typical NE) | Higher on average | Lower on average |
| Price volatility | Moderate | Moderate (different cycle) |
| Supply reliability | Delivery scheduling required | On-demand, no scheduling |
| Tank / infrastructure | Tank aging/liability | No tank |
| Rural availability | Available everywhere | Not available in many rural areas |
| Payback period | N/A | 4–8 years typically |
Who Should Convert (and Who Probably Shouldn't)
Convert makes sense if: Natural gas is available on your street, you're planning to stay in the home 7+ years, your oil tank is aging and needs replacement soon anyway (that cost should be counted against the conversion — you're replacing equipment either way), and the local price differential is consistently significant.
Stay with oil if: Natural gas isn't available in your area, you're planning to sell in the next few years, you've recently replaced your oil equipment with high-efficiency units, or you're considering eventual transition to electric heat pumps (in which case converting to gas now is an intermediate step that may not be worth the cost).
The heat pump question: Electric heat pumps are increasingly competitive with both oil and gas in the Northeast, particularly with cold-climate models rated for operation down to -15°F. Federal Inflation Reduction Act credits (25C) and many state incentives can reduce heat pump installation costs significantly. If you're at a decision point on heating system replacement, it's worth getting a heat pump quote alongside gas conversion and high-efficiency oil replacement quotes before deciding.
Bottom line: Natural gas conversion is financially sound for many Northeast homeowners — but do the specific math for your home, get multiple contractor quotes, check available rebates, and think honestly about your time horizon in the property. It's not a universal yes.
If you're staying with oil: Compare oil prices from dealers in your area → · 11 ways to reduce your oil heating costs
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See Current Prices →Related: Heating Oil vs. Natural Gas Cost Comparison: What You Actually Pay · Oil to Gas Conversion: What It Actually Costs to Switch from Heating Oil