Natural Gas vs. Oil Heating Cost: The Real Numbers
Quick answer: Natural gas is cheaper than heating oil for most homes — typically 30–50% less per year of heating. A gas furnace costs roughly $1,200–$2,400 per season for an average home, versus $2,000–$3,500 for oil, depending on region and prices. Oil only wins where gas lines don’t reach and electric alternatives are impractical — and even there, heat pumps increasingly beat both.
Cost per Unit of Heat, Compared
| Fuel | Typical Price | Energy Content | Cost per Million BTU* |
|---|---|---|---|
| Natural gas | $1.20–$2.00 per therm | 100,000 BTU/therm | $13–$22 |
| Heating oil | $3.50–$4.50 per gallon | 138,500 BTU/gallon | $27–$35 |
| Electric heat pump | $0.13–$0.20 per kWh | 3,412 BTU/kWh (×2.5–4 COP) | $11–$20 |
*Adjusted for typical system efficiency: 92% gas furnace, 85% oil boiler, heat pump COP 3. Prices vary by region and season — check your utility’s current rates.
“When clients compare gas and oil, I make them look at ten years, not one winter. Oil tanks age out, oil burners need annual service, and oil prices swing twice as hard as gas. The sticker price of the furnace is the smallest number in the equation.”
— Sandra Whitmore, Certified Energy Auditor, GreenPath Home Energy
Beyond the Fuel Bill
- Equipment: gas furnaces run $4,000–$8,000 installed; oil boilers $6,000–$10,000, plus tank replacement ($1,500–$3,000 every 20–30 years).
- Maintenance: oil systems need annual cleaning ($150–$300); gas systems are lower-maintenance.
- Conversion: switching oil to gas typically costs $5,000–$12,000 including the line hookup — and often pays back in 5–8 years.
- Resale: buyers and inspectors increasingly flag aging oil tanks, especially buried ones, as a liability.
When Oil Still Makes Sense
No gas line on the street, a recently replaced high-efficiency oil boiler, or a region with unusually cheap oil delivery. Otherwise, if a conversion quote pays back inside eight years, the math favors switching — or leapfrogging both with a cold-climate heat pump.
Frequently Asked Questions
Is it cheaper to heat with natural gas or oil?
Natural gas, in almost every market — usually 30–50% less per year for the same house.
How much does an oil-to-gas conversion cost?
Typically $5,000–$12,000 including equipment and utility hookup, with payback commonly in 5–8 winters.
Should I convert to gas or install a heat pump?
Get quotes for both. In moderate climates, modern heat pumps often beat gas on running cost; in severe cold, dual-fuel setups pair the two.
Keep reading: the maintenance calendar that catches problems early and which home upgrades actually pay back.
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