Natural Gas vs Propane: Cost Comparison

The natural gas vs propane cost question comes down to more than the price on the bill. Natural gas is usually cheaper per unit of heat, but it only reaches homes connected to a utility pipeline. Propane can go anywhere a delivery truck can reach, but you pay for the tank, the delivery, and a fuel whose price moves with oil markets. For a typical home, natural gas heating costs hundreds of dollars less per year, yet propane remains the right choice for millions of rural households that have no pipeline option.

Fuel Prices Compared

Fuel prices are quoted in different units, which makes direct comparison tricky. Natural gas is billed per therm, where one therm equals 100,000 BTU. Propane is sold per gallon, where one gallon contains about 91,500 BTU. To compare fairly, convert both to cost per million BTU, or MMBtu. In 2026, residential natural gas commonly runs $1.00 to $1.80 per therm, or roughly $10 to $18 per MMBtu, while residential propane commonly runs $2.50 to $3.50 per gallon, or roughly $27 to $38 per MMBtu before accounting for appliance efficiency.

That gap is the core of the cost story. Even at the high end of natural gas pricing and the low end of propane pricing, natural gas delivers heat at roughly half the fuel cost per BTU. The gap narrows in regions with expensive natural gas delivery charges and widens where propane must be trucked long distances. Local rates matter enormously, so pull your actual utility tariff and your local propane dealer's delivered price before making a decision.

Price stability also differs. Natural gas prices are regulated in many states and move gradually, while propane prices swing seasonally, often peaking in winter when demand is highest. Many propane dealers offer budget plans, pre-buy contracts, and summer fill discounts that smooth out the spikes. If you heat with propane, buying in summer and locking a price before heating season can save 10 to 20 percent compared with spot winter deliveries.

Heating Cost per Household

The table below estimates annual heating fuel costs for a typical 2,000-square-foot home in a moderate climate, assuming an 80 percent efficient furnace. Warmer climates will cost less, colder climates more, but the relative gap between fuels holds in most regions.

The difference, roughly $1,200 to $1,600 per year for heating alone, is why homeowners with access to a natural gas main rarely switch to propane. Add water heating, cooking, and clothes drying, and the annual gap grows further, since every gas appliance benefits from the cheaper fuel. Over a 15-year furnace lifespan, the fuel savings from natural gas can exceed $15,000, which dwarfs most connection costs.

Propane households can narrow the gap with efficiency. A 95 percent efficient condensing propane furnace uses about 16 percent less fuel than an 80 percent model, and a heat pump paired with a propane furnace as backup can cut propane consumption sharply in mild weather. Insulation, air sealing, and a programmable thermostat reduce fuel use regardless of which gas you burn, and they pay back fastest for propane households because each saved gallon is worth more.

Equipment and Installation Costs

Equipment costs are similar for both fuels, with propane carrying a few extras. A gas furnace costs roughly the same whether it burns natural gas or propane, since most models ship as natural gas units and convert to propane with a kit costing $50 to $150. Water heaters, ranges, and dryers follow the same pattern: the appliance price is nearly identical, and conversion is a minor add-on.

The bigger difference is infrastructure. A natural gas connection involves a utility service line from the street main to your meter, and the utility may charge $0 to $2,000 for the hookup depending on distance and local policy. Some utilities waive the fee or amortize it to win a new customer. Propane requires a tank, which costs $400 to $1,200 to buy for a 120-gallon tank, $1,200 to $2,500 for a 500-gallon tank, or $50 to $150 per year to lease from a dealer. Underground propane tanks cost more to install but keep the yard clear.

Ongoing infrastructure costs also favor natural gas slightly. Natural gas has a monthly service charge, typically $10 to $30, but no tank rental or delivery fees. Propane households may pay tank rental, delivery fees, and minimum delivery charges, though many dealers waive fees for customers on automatic delivery or budget plans. When comparing total cost, add these fixed charges to the fuel cost for a complete picture.

Availability and Convenience

Availability is propane's strongest advantage. Natural gas reaches about half of US homes through utility pipelines, concentrated in cities and suburbs. Rural homes, mountain properties, and homes far from a gas main often have no pipeline option at all, and extending a main can cost $20,000 or more if the utility agrees to it. Propane delivery trucks serve nearly every region of the country, making propane the default gas choice beyond the grid.

Convenience cuts both ways. Natural gas never runs out, needs no deliveries, and requires no tank monitoring. You pay a monthly bill and the fuel is always there. Propane requires watching the tank gauge, scheduling deliveries, and keeping the tank accessible for trucks in winter. Automatic delivery programs, where the dealer monitors your usage and schedules fills, remove most of this burden, and tank monitors that send readings to the dealer are increasingly standard.

For homes that do have a natural gas main nearby, connection is usually straightforward. The utility runs the service line, sets the meter, and a plumber connects the house piping. For an overview of home gas piping, see our gas lines hub. If you are adding appliances after connecting, our gas appliance hookup cost guide covers what each connection typically runs.

Efficiency and Performance

Both fuels burn cleanly and power the same high-efficiency equipment. Modern condensing furnaces reach 95 to 98 percent efficiency on either fuel, and tankless water heaters perform identically once properly converted. The practical performance difference is minimal, and appliance choice matters far more than fuel choice for efficiency.

One technical difference is energy density. Propane contains about 2,500 BTU per cubic foot as a vapor, compared with about 1,000 BTU per cubic foot for natural gas. That means propane appliances use smaller gas orifices and, for the same BTU output, move less gas volume through the piping. It also means propane lines are sized differently, so a system designed for one fuel cannot simply be switched to the other without re-sizing and conversion. Our gas line sizing guide explains how pipe size is calculated for each fuel.

Cooking performance is a wash for most homeowners. Both fuels give instant, adjustable flame heat that electric ranges cannot match. Some cooks prefer natural gas for its slightly softer flame, but the difference is subtle, and burner design matters more than fuel type. For clothes drying and water heating, the two fuels are functionally interchangeable.

Safety and Storage Differences

Both fuels are safe when handled properly, but their properties differ in ways that affect safety planning. Natural gas is lighter than air, so a leak rises and disperses outdoors or through ventilation. Propane is heavier than air, so a leak pools in low spots such as basements, crawlspaces, and floor drains, where it can accumulate to dangerous concentrations. This is why propane appliances are never installed in below-grade pits without special ventilation, and why propane leak detectors are placed low on walls.

Storage is a propane-only consideration. A propane tank must sit on a stable base, at required distances from the house, ignition sources, and property lines, typically 10 feet for a 500-gallon tank. The tank needs periodic inspection, and the relief valve must stay clear. Natural gas has no on-site storage, which removes this entire category of maintenance and risk. Both fuels are odorized with a rotten-egg smell so leaks are detectable, and both require the same response to a suspected leak: leave the area and call the utility or 911 from a safe distance.

Environmental Comparison

Natural gas burns cleaner than propane per unit of energy delivered. Per MMBtu, natural gas produces about 117 pounds of CO2, compared with about 139 pounds for propane. Natural gas also produces less soot and particulate matter. Natural gas also produces less soot and particulate matter. The more significant environmental concern for natural gas is methane leakage during production and pipeline transport, since methane is a potent greenhouse gas.

Propane's environmental profile is cleaner on leakage, since it is transported as a liquid in sealed tanks with minimal fugitive emissions, and it produces no methane slip. Neither fuel is a low-carbon solution compared with electric heat pumps powered by renewable electricity, but both are substantially cleaner than heating oil or coal. Homeowners prioritizing emissions should focus first on efficiency, insulation, and, where practical, a heat pump, since those steps cut fuel use regardless of which gas is burned.

Which Fuel Should You Choose?

Choose natural gas if a main is available at reasonable connection cost. The fuel savings, typically $1,000 or more per year for a full-gas home, pay back the connection cost quickly and continue for the life of the home. Natural gas also removes tank management entirely and adds resale appeal in neighborhoods where buyers expect it.

Choose propane if no gas main is available, if connection costs are prohibitive, or if you value fuel independence. Propane pairs well with solar and backup generators, since a propane tank stores energy on site through outages, while natural gas service can be interrupted during major disasters. Many rural homeowners also appreciate that propane works for the whole property, from the house to a workshop, barn, or pool heater, without utility permission.

If you already heat with propane and a gas main arrives in your neighborhood, run the numbers before switching. Compare the utility's connection fee, the cost of converting or replacing appliances, and your projected annual savings. For most full-gas homes, the payback is two to four years. If you are planning a new gas installation or appliance hookup and want a qualified local installer, call (877) 762-1902.