Gas vs Electric Furnace Replacement Cost: Full Comparison
Gas vs electric furnace: upfront replacement cost
When replacing a furnace, fuel type is one of the biggest cost decisions you will make. Gas furnaces cost more upfront but typically run cheaper month to month in most U.S. climates. Electric furnaces are less expensive to purchase and install but carry higher operating costs in cold climates where the furnace runs heavily.
Use our furnace replacement cost calculator to compare total cost of ownership for gas versus electric in your specific climate zone and utility rate.
Side-by-side cost comparison
| Furnace type | Unit cost | Installation | Total installed |
|---|---|---|---|
| Natural gas (80% AFUE) | $1,200 to $2,200 | $800 to $1,500 | $2,000 to $3,700 |
| Natural gas (96% AFUE) | $1,800 to $3,500 | $800 to $1,800 | $2,600 to $5,300 |
| Propane furnace | $1,400 to $3,000 | $900 to $2,000 | $2,300 to $5,000 |
| Electric furnace (basic) | $700 to $1,500 | $400 to $1,000 | $1,100 to $2,500 |
| Electric furnace (larger) | $1,200 to $2,500 | $600 to $1,500 | $1,800 to $4,000 |
| Oil furnace | $2,000 to $5,000 | $1,500 to $3,000 | $3,500 to $8,000 |
Why gas furnaces cost more to install
Gas furnaces require a flue pipe, a gas line connection, and often a drain for high-efficiency condensate. If the home does not already have a gas line, running one from the street to the furnace can add $500 to $2,000 or more to the project. In homes already set up for gas, the installation is straightforward and takes 4 to 6 hours.
Electric furnaces only need an electrical connection, typically a 240-volt circuit. If your panel can support the load, installation is simpler and faster, which is part of why labor costs are lower.
Operating cost difference over time
In most U.S. regions, natural gas costs roughly $1.00 to $1.50 per therm, while electricity averages $0.13 to $0.17 per kilowatt-hour. Heating a 2,000 square foot home through a cold winter can cost $600 to $1,200 with natural gas and $1,200 to $2,400 with an electric resistance furnace. Over 10 years that gap can exceed $5,000 to $12,000, which easily offsets the higher upfront cost of a gas unit in cold climates.
- Gas furnace is usually better for: Cold climates (Midwest, Northeast, Mountain West), homes already on a gas line, homeowners who plan to stay 5 or more years.
- Electric furnace makes sense for: Mild climates (parts of the South and Pacific Coast), homes without access to a gas line, short-term ownership, or as backup heat in a dual-fuel heat pump system.
Propane and oil: the alternatives
Propane furnaces work like gas units but require a tank on the property. Fuel cost per BTU is typically higher than natural gas, making them more expensive to operate. Oil furnaces are common in the Northeast, where natural gas infrastructure is less widespread. Oil prices fluctuate significantly and oil systems require annual maintenance to stay efficient. Both fuel alternatives have higher long-term operating costs than natural gas in most scenarios.
Get quotes from a licensed HVAC pro before switching fuel types, as the conversion cost can be substantial.
Frequently asked questions
Is a gas furnace always cheaper to operate than electric? In most U.S. climates yes, because natural gas costs less per BTU of heat produced than electric resistance heating. In mild climates with cheap electricity and a heat pump, the math can flip.
Can I switch from oil to gas when I replace my furnace? Yes, but budget an extra $1,000 to $3,000 or more for running a gas line. Contact your local utility first to confirm availability and line extension costs in your area.
Does an electric furnace last longer than a gas furnace? Electric furnaces have fewer moving parts and no combustion components, so they often last 20 to 30 years versus 15 to 20 for gas. Factor longevity into your total cost comparison.
Bottom line
Gas furnaces cost $2,000 to $5,300 installed for most homes and have lower operating costs in cold climates. Electric furnaces run $1,100 to $4,000 installed but cost more to run in cold winters. Choose fuel type based on what line is already in your home, your climate, and how long you plan to stay. Get quotes from a licensed HVAC contractor before deciding.
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