Heat Pump vs Gas Furnace: Operating Cost Math, Cold Weather, Emissions and What to Buy in 2026

A heat pump costs less to run than a gas furnace wherever its seasonal efficiency beats the break-even point set by your local electricity and gas prices, and at 2026 national-average prices that point is a coefficient of performance (COP) of roughly 3.2. In mild and moderate climates, or anywhere with cheap electricity, a modern heat pump clears that bar and also gives you air conditioning; in the coldest regions with cheap gas, a furnace or a dual-fuel hybrid still wins on operating cost. This guide walks through the math, cold-weather performance, emissions, lifespan, installed cost and the 2026 incentive picture, using published price data and manufacturer specifications rather than hands-on testing.

At a glance

The operating cost math

Every comparison comes down to one conversion: 1 therm of gas contains 100,000 BTU, and 100,000 BTU equals 29.3 kWh of electricity. A furnace turns therms into heat at its AFUE (annual fuel utilization efficiency), so a 96% AFUE furnace burns 1.04 therms to deliver 100,000 BTU. A heat pump moves heat rather than making it, so it delivers 100,000 BTU using 29.3 kWh divided by its COP. Our how heat pumps work explainer covers why that COP can exceed 1.

Using round numbers close to 2026 national averages, $0.17 per kWh and $1.50 per therm:

The break-even COP is (electricity price × 29.3) ÷ (gas price ÷ AFUE). At these prices against a 96% furnace it is 3.2; against an older 80% furnace it is 2.7. A heat pump’s seasonal COP is roughly its HSPF2 divided by 3.41, so an HSPF2 of 9 suggests a seasonal COP near 2.6 and an HSPF2 of 11 near 3.2, before real-world adjustments for climate, sizing and duct losses. See our SEER2, HSPF2 and COP explainer for the caveats.

Because prices vary so much by region, the break-even point does too:

Two adjustments matter. First, many utilities now offer heat pump or time-of-use rate plans that lower the effective electricity price. Second, if you keep a gas furnace you also keep the gas meter’s fixed monthly charge, typically $10–$40, which a fully electric home avoids. Pull your last twelve months of bills and plug your own prices into our heat pump cost calculator.

A worked annual example

Take a 2,000-square-foot home in a climate-zone-5 city that needs about 60 million BTU of heat per year. A 96% furnace uses 625 therms, or about $938 at $1.50 per therm. A cold-climate heat pump averaging a seasonal COP of 2.8 uses about 6,280 kWh, or $1,068 at $0.17 per kWh; at a seasonal COP of 3.2 it uses 5,500 kWh, or $934. In other words, in a cold climate at average prices the two are within about $130 a year of each other, and the heat pump also replaces the air conditioner. In a climate-zone-3 home needing 30 million BTU, the furnace costs about $469 and a heat pump at COP 3.3 about $453, again nearly even on heating, with the heat pump’s cooling efficiency as a bonus.

Cold-weather performance

A furnace produces its full output at any outdoor temperature. A heat pump’s capacity and efficiency both fall as the air gets colder, because there is less heat to extract. Standard heat pumps may deliver only 50–70% of rated capacity at 5°F and lean on electric strip heat (COP 1.0) below their balance point. Cold-climate models from Mitsubishi, Fujitsu, Bosch, Carrier and others hold 100% of rated capacity at 5°F and keep operating to -13°F or lower, with NEEP-listed COPs at 5°F typically around 1.8–2.3. That is still cheaper than strip heat but usually more expensive than gas at that temperature. Our best heat pumps for cold climates guide and DOE Cold Climate Heat Pump Challenge coverage list the models that do this well.

A dual-fuel hybrid pairs a heat pump with a gas furnace and lets the thermostat switch to gas below an economic balance point, usually set somewhere between 20°F and 35°F depending on your prices. It costs the most up front but gives the lowest operating cost at every temperature and full backup during an outage-free cold snap. It is the standard recommendation in climate zones 6 and 7 where gas is available.

Comfort is different too. A furnace blows air at 120–140°F in short bursts; a heat pump supplies air at 90–110°F for longer, steadier cycles. Some homeowners describe heat pump air as “cool” at first, but the steadier temperature and humidity usually win people over within a season.

Emissions

Burning a therm of natural gas releases about 5.3 kg of CO2, so a 96% furnace emits roughly 5.5 kg per 100,000 BTU of heat delivered, not counting methane leakage upstream. A heat pump has no on-site emissions; its footprint depends on the grid. At the EPA eGRID U.S. average of roughly 0.37–0.39 kg CO2 per kWh, a heat pump at COP 3.0 causes about 3.7 kg per 100,000 BTU, a third less than the furnace, and at COP 2.0 about 5.6 kg, roughly even. On clean grids (the Pacific Northwest, upstate New York, California) the heat pump wins at any COP; on coal-heavy grids the advantage narrows. Grids are getting cleaner every year, so a heat pump installed today will have a lower footprint in 2036 than it does now, while a furnace will not.

Lifespan and maintenance

Gas furnaces typically last 15–20 years and often longer, because they run only in winter. Heat pumps run year-round for heating and cooling, and 12–15 years is the usual planning figure, with well-maintained inverter systems sometimes reaching 20. In a dual-fuel setup the furnace usually outlasts the heat pump. Annual maintenance costs are similar ($150–$300 per visit), but a furnace adds combustion-safety items: heat exchanger inspection, venting and a carbon monoxide detector. Our maintenance checklist covers what a heat pump needs each year.

Installed cost

Typical installed prices (2026, before incentives), assuming existing ductwork and gas service:

• Gas furnace only (95–98% AFUE): $4,500–$9,000
• Gas furnace plus central AC: $9,000–$17,000
• Central heat pump with air handler: $10,000–$20,000; premium cold-climate variable-speed systems can reach $25,000
• Dual-fuel heat pump plus furnace: $12,000–$22,000
• Extras: electrical panel upgrade $1,500–$4,000 if needed for a heat pump; new gas line or venting $500–$2,500 for a furnace; new ductwork $3,000–$8,000+ for either

The fair comparison is heat pump versus furnace plus AC, because nearly every U.S. home that installs a furnace also wants cooling. On that basis the up-front gap is small or nonexistent. Our 2026 heat pump cost guide breaks down the drivers.

Which should you choose

Heat pump:

Gas furnace:

Choose a heat pump if you are in climate zone 1–4, you need to replace your AC anyway, your home has no gas service, or your electricity costs less than about 3× your gas price divided by 29 (the break-even rule above). Choose a furnace, or better, dual fuel, if you are in climate zone 6 or 7 with gas under $1.25 per therm and electricity above $0.15 per kWh, or you have a newer furnace and only need cooling, in which case read our heat pump vs air conditioner comparison. If you are unsure which zone or situation you are in, our is a heat pump right for my home guide walks through the decision.

Our recommendation

For most U.S. homes, a modern heat pump is the better choice: it costs about the same to install as a furnace and air conditioner together, it costs the same or less to run at typical prices in climate zones 1–5, it cuts emissions, and it is the only option most rebate programs still fund in 2026. Choose a cold-climate model sized by a proper load calculation (see our sizing guide) and you will not miss the furnace. If you live where winters are severe and gas is cheap, a dual-fuel system gives you the best of both, and a high-efficiency furnace alone remains a sound choice only if you already have a working air conditioner you intend to keep. Start with our best heat pumps rankings when you are ready to compare models.