The heating technology decision—heat pump vs. furnace—is shifting rapidly. Ten years ago, furnaces dominated. In recent years heat pumps have outsold gas furnaces in the U.S., helped by better cold-weather performance and the fact that one unit both heats and cools.
But the cost comparison is more complex than equipment price and efficiency rating. Most people miscalculate by ignoring electricity rates, backup heating needs, installation complexity, and regional climate differences.
Understanding Heat Pumps vs. Furnaces
Furnace (Gas or Electric):
- Heats by combustion (gas) or resistance (electric)
- Efficiency: 80-98% AFUE
- Fuel: Natural gas or electricity
- Cost: $3,000-$6,000
- Setup: Direct replacement, simple install
- Lifespan: 15-20 years
Heat Pump (Air-Source or Ground-Source):
- Moves heat from outside air into home (or ground)
- Efficiency: 300-400% COP (Coefficient of Performance) in mild climates, worse in extreme cold
- Fuel: Electricity only
- Cost: $6,000-$12,000+ (especially ground-source)
- Setup: More complex installation
- Lifespan: 15-20 years
- Backup heating: Often requires electric resistance or gas furnace
The Operating Cost Comparison (Where People Miscalculate)
The biggest mistake: comparing efficiency ratings without accounting for fuel prices. A heat pump delivers two to four units of heat per unit of electricity, but a kilowatt-hour of electricity usually costs several times more than the same energy as natural gas.
Two conversions make the comparison possible:
- 1 therm of gas = 100,000 BTU; a 95% furnace turns it into 95,000 BTU of heat
- 1 kWh of electricity = 3,412 BTU; a heat pump with a seasonal COP of 2.5 turns it into 8,530 BTU
Real cost comparison example:
Scenario: a 2,000 sq ft home in a cold climate that needs 60 million BTU of heat over a winter. Gas at $1.60 a therm and electricity at $0.17 a kWh, close to U.S. averages.
| Heating system | Fuel used | Cost per winter |
|---|---|---|
| Gas furnace, 95% efficient | 632 therms | $1,011 |
| Air-source heat pump, seasonal COP 2.5 | 7,034 kWh | $1,196 |
| Propane furnace, 95%, at $2.80 a gallon | 690 gallons | $1,933 |
| Oil furnace, 85%, at $3.80 a gallon | 510 gallons | $1,937 |
| Electric resistance (baseboard or furnace) | 17,585 kWh | $2,989 |
What this shows:
- Against natural gas at average prices, a heat pump in a cold climate costs slightly more to run, here about $185 a year
- Against propane, heating oil or electric resistance heat, the heat pump saves $700–$1,800 a year
- In a mild climate the same home might need 30 million BTU at a seasonal COP of 3.2: $505 a year with gas against $467 with the heat pump
There's no universal winner. It depends on your fuel prices, your climate and what you are replacing.
The Climate Factor: Where Heat Pumps Lose Efficiency
A heat pump's efficiency falls as the outdoor air gets colder, because it has to lift heat across a bigger temperature difference. Typical figures for a modern variable-speed unit:
- At 47°F: COP of about 3–4
- At 17°F: about 2–2.5
- At 5°F: about 1.5–2, still 50–100% more heat per kWh than resistance heating
- Below 0°F: cold-climate models keep running, many down to −13°F or lower, but capacity drops and backup heat covers more of the load
Seasonal averages follow the climate: roughly 3–3.5 in mild winters, 2.5–3 in moderate ones and 2–2.5 in cold ones once backup heat is counted. A heat pump in Minneapolis performs very differently from one in Austin, so ask for a cold-climate model (on the NEEP cold-climate list) and size it for your design temperature.
The Price Ratio That Decides It
Running cost comes down to the ratio of your gas and electricity prices. The heat pump is cheaper to run when gas costs more than the break-even price below for your electricity rate (compared with a 95% furnace):
| Electricity price | Break-even gas price at seasonal COP 2.5 | At seasonal COP 3.0 |
|---|---|---|
| $0.10/kWh | $1.11/therm | $0.93/therm |
| $0.15/kWh | $1.67/therm | $1.39/therm |
| $0.20/kWh | $2.23/therm | $1.86/therm |
| $0.25/kWh | $2.78/therm | $2.32/therm |
| $0.30/kWh | $3.34/therm | $2.78/therm |
The rule of thumb: divide your gas price per therm by your electricity price per kWh. Above about 11, a heat pump wins even in cold climates; below about 9, gas usually wins; in between it depends on the climate and the unit. Use the prices on your bills, including delivery charges, not just the supply rate.
Installation Complexity: Heat Pump Hidden Costs
Heat pump installation is more complex than furnace replacement:
- Outdoor unit placement - Requires adequate space, may need landscaping
- Refrigerant lines - Must be precisely sized, sealed, and charged
- Electrical upgrade - Heat pumps draw significant power; some homes need electrical upgrades ($1,000-$3,000)
- Ductwork modifications - Heat pumps require balanced airflow design
- Backup heating - Requires integration with existing system or new installation
These complicating factors add $2,000-$5,000 to heat pump costs compared to furnace replacement.
Most quotes don't itemize these, so you don't realize the true cost.
Incentives: What Changed in 2026
Until the end of 2025, the federal energy efficient home improvement credit (Section 25C) paid 30% of a qualifying heat pump's cost, up to $2,000. It does not apply to heat pumps installed after December 31, 2025, so the federal tax credit is no longer part of the comparison.
What remains is local: some states and utilities still offer heat pump rebates, discounted electricity rates for homes that heat electrically, or financing programs. Check your utility and state energy office before you get quotes, because a rebate can still change which option is cheaper up front.
Actionable Decision Framework
Choose Heat Pump if:
- Your gas price per therm is more than about 10 times your electricity price per kWh, or you heat with propane, oil or electric resistance
- Your climate is mild to moderate, or you buy a cold-climate model
- Your state offers significant rebates/incentives
- You're replacing existing AC (no additional outdoor unit cost)
- You want integrated heating/cooling efficiency
- Long-term ownership (15+ years)
Choose Furnace if:
- Your gas price per therm is less than about 9 times your electricity price per kWh
- You're in a very cold climate and don't want to rely on backup heat
- No state incentives available
- You need budget-friendly installation today
- You want simple, proven technology
- Short-term ownership (less than 10 years)
Hybrid approach:
Install a heat pump for heating/cooling, with a gas furnace as backup for extreme cold. This captures heat pump efficiency while avoiding extreme-cold performance collapse.
More expensive upfront, but optimal performance in many climates.
The Bottom Line: Fuel Prices and Climate Determine the Winner
There is no universal "best" choice between heat pump and furnace.
The decision depends entirely on:
- Your local electricity and gas prices
- Your climate (average winter temperature)
- Available incentives in your state
- Your planned holding period
Run the numbers with your actual local rates before deciding.
A heat pump in Washington State, with cheap hydroelectric power, wins easily. A heat pump in a cold state with expensive electricity and cheap gas can cost more to run than a furnace, while still beating propane or oil by a wide margin.
Don't accept the industry trend toward heat pumps without verifying the economics make sense for your specific location and situation.