Propane vs Natural Gas: Complete Cost Comparison (2026)
BTU-normalized comparison using 2026 prices. The honest answer: natural gas is cheaper per BTU, but 40% of US homes have no access to it.
Source: EIA SHOPP residential propane survey. Current data is the final release of the 2025/26 heating season (week ending 30 March 2026). EIA pauses weekly publication April-September; next release expected October 2026. Refreshed 15 May 2026.
Propane vs Natural Gas: 15-Factor Comparison
| Factor | Propane | Natural Gas | Winner |
|---|---|---|---|
| Unit price | $2.67/gal (Apr 2026) | $1.38/therm (Apr 2026) | Natural Gas |
| BTU per unit | 91,500 BTU/gal | 100,000 BTU/therm | Natural Gas |
| Typical furnace efficiency | 95-98% AFUE | 80-98% AFUE | Propane |
| Cost per 100k BTU | $3.08 | $1.45 | Natural Gas |
| Annual heating cost (avg home) | $2,500-$3,500 | $1,000-$1,800 | Natural Gas |
| Availability | All 50 states, all areas | 60% of US homes only | Propane |
| Infrastructure needed | Tank on property | Gas main connection required | Propane |
| Monthly supply fee | $0 (pay per fill) | $15-$30/month utility fee | Propane |
| Energy density | 91,500 BTU/gal (higher) | 1,020 BTU/cu ft (lower) | Propane |
| CO2 emissions per MMBtu | 139 lbs | 117 lbs | Natural Gas |
| Methane leakage risk | Negligible | Pipeline/wellhead leaks | Propane |
| Price volatility | Moderate (more domestic) | Moderate (Henry Hub tied) | Tie |
| Cooking BTU output | Higher BTU burners available | Lower BTU burners typical | Propane |
| Power outage resilience | Fully independent of grid | Grid-independent on fuel side | Tie |
| Tank/line installation cost | $1,500-$2,800 (tank) | $500-$3,000 (line connection) | Tie |
The Real Question: Is Natural Gas Even Available to You?
Natural gas is cheaper per BTU, full stop. But this comparison is irrelevant for the approximately 40% of US homes that cannot access a natural gas pipeline. Rural homes, new suburban developments, and most homes in mountainous regions have no gas line access and never will, given the economics of pipeline extension.
If you cannot access natural gas, the propane vs natural gas comparison is a thought experiment. Your real choice is propane vs electric (including heat pumps) vs heating oil (in the Northeast). See our detailed comparisons for each:
Scenario-Based Recommendations
You have no choice. Focus on getting the best propane price: own your tank, fill in summer, get multiple quotes.
Connect to the gas line. The $1,000 to $1,500 in annual savings will pay for the connection in 2 to 3 years.
Budget the infrastructure cost from the start. Consider a dual-fuel system (heat pump + propane backup) for the best efficiency in cold climates.
Professional-grade propane burners deliver higher BTU output than residential gas ranges. Many chefs prefer propane.
Heat pump efficiency (COP 3.0+) in mild climates makes it cheaper than both propane and natural gas at current prices.