The short answer
It depends on what you are replacing. If your furnace and AC are both due, a same-size ducted heat pump actually installs for slightly less — about $8,100–$14,200 for a 3-ton mid-tier unit against $9,300–$16,600 for the AC-plus-gas-furnace combo on existing ductwork — because one outdoor unit replaces two machines. The heat pump costs more only when the alternative is replacing the furnace alone ($5,700–$9,800 for 80k BTU) and keeping a working AC. And since a heat pump burns no fuel, whether it saves money after install day depends on your climate and on how your local electricity price compares with gas.
Rule of thumb: in mild-winter regions, or where electricity is cheap and gas is expensive, a heat pump often wins over its life. In cold climates with cheap natural gas, a high-efficiency furnace (or a dual-fuel setup) usually stays ahead. The figures below are planning ranges, not bids — price your exact tonnage, efficiency tier, and duct condition in the HVAC replacement calculator, then use the band to sanity-check any contractor bid.
Heat pump vs furnace: side-by-side cost comparison
| System | Installed cost | Heats? | Cools? | Fuel | Lifespan |
|---|
| AC + gas furnace combo (3-ton, mid) | $9,300 – $16,600 | Furnace | AC | Gas + electric | Furnace 15–20 / AC 12–15 yr |
| Gas furnace only (80k BTU) | $5,700 – $9,800 | Yes | No | Gas | 15 – 20 yr |
| Ducted heat pump (3-ton, mid) | $8,100 – $14,200 | Yes | Yes | Electric | 10 – 15 yr |
| Ductless mini-split (3-zone) | $11,200 – $18,200 | Yes | Yes | Electric | 15 – 20 yr |
Upfront cost: it depends on what you are replacing
When only the furnace dies and the AC still works, the like-for-like swap is the cheapest way back to comfort: a furnace by itself (80k BTU) runs $5,700–$9,800 installed. But when both machines are due, the arithmetic shifts. A mid-efficiency 3-ton AC-plus-gas-furnace combo on existing ducts runs $9,300–$16,600, while a 3-ton mid-tier ducted heat pump runs $8,100–$14,200 — slightly less, because one outdoor unit and an air handler replace a condenser and a furnace. High-efficiency and cold-climate models push the heat-pump band up from there.
Two add-ons move the heat-pump number more often than the furnace number. If the existing ducts are leaky or undersized, full duct replacement adds $4,700–$8,000. And because a heat pump draws more electrical load than a gas furnace, an older home sometimes needs a $2,050–$3,500 panel upgrade to a 200-amp service. Model both against your ducts and panel in the HVAC calculator.
Operating cost: where the heat pump earns it back
A furnace makes heat by burning gas; a heat pump moves heat that already exists in the outside air, which is why it can deliver several units of heat per unit of electricity. That efficiency is real, but whether it lowers your bill depends on two local variables the sticker price can't capture: your climate and the price of electricity versus gas in your area.
In a mild winter, or where electricity is cheap and gas is dear, a heat pump's running cost can undercut a gas furnace enough to pay back the higher install over several years. In a cold climate with cheap natural gas, the furnace often stays cheaper to run. Because those energy prices vary so widely by state, we don't bake a single national operating-cost number into this guide — for a state-by-state electric-heat comparison with rebates and payback, ElectrifyCost's heat pump cost calculator models it directly.
Cold climates and the dual-fuel middle path
The old knock on heat pumps — that they quit in real cold — is largely outdated. Modern cold-climate heat pumps hold useful capacity well below freezing, which has pushed them far north of where they used to make sense. Still, the coldest zones have a smart hedge: the dual-fuel (hybrid) system.
A dual-fuel setup pairs a heat-pump-capable outdoor condenser with a gas furnace indoors. The heat pump does the cooling and carries mild-weather heating on electricity; the furnace takes over on the handful of days each winter when burning gas is both warmer and cheaper. It is the natural choice when a working furnace is staying and you want to add efficient cooling and shoulder-season heat — and it insulates you against a spike in either fuel's price.
Lifespan: one clock or two
A furnace-and-AC pair runs on two replacement clocks: a gas furnace lasts about 15–20 years, central AC about 12–15. A ducted heat pump is a single machine, but it runs year-round for both heating and cooling, so it tends to wear faster — plan on 10–15 years. Ductless mini-splits last longer, around 15–20 years.
That difference matters for the long-run math: a heat pump you replace every 12 years or so has to earn its operating-cost savings inside that window, while a furnace can quietly run for two decades. Annual service and clean filters stretch all of these; coastal salt air and neglect shorten them.
The federal tax credit has changed
Through 2025, the federal Section 25C credit sweetened the heat-pump math for many homeowners. That window has closed. The credit applied only to qualifying high-efficiency heat pumps, central AC, and furnaces placed in service on or before December 31, 2025. Under current IRS guidance following the One Big Beautiful Bill Act (July 2025), projects placed in service in 2026 generally do not qualify.
What may still help: state and local utility rebates for high-efficiency and electric equipment often continue independent of the federal credit — check your utility's program before you buy. Verify any federal eligibility on IRS Form 5695.
Frequently asked questions
Is a heat pump cheaper than a furnace?
Against a furnace alone, no: a ducted heat pump installs for $8,100–$14,200 (3-ton mid-tier) versus $5,700–$9,800 for an 80k BTU furnace. But against replacing a furnace and AC together, the heat pump is actually slightly cheaper — $8,100–$14,200 versus $9,300–$16,600 — because one machine does both jobs. On top of that it moves heat instead of burning fuel, so in mild climates or where electricity is cheap relative to gas, its running cost can pull further ahead over the system's life.
How much does a heat pump cost vs an AC and furnace?
At the same 3-ton mid-efficiency tier in 2026, a ducted heat pump runs about $8,100–$14,200 installed versus $9,300–$16,600 for an AC-plus-gas-furnace combo on existing ducts. A ductless mini-split heat pump for three zones runs about $11,200–$18,200. Duct replacement, if needed, adds $4,700–$8,000, and a heat pump sometimes needs a $2,050–$3,500 electrical panel upgrade.
Does a heat pump work in cold climates?
Modern cold-climate heat pumps hold useful capacity well below freezing, which has made them viable far north of their old territory. In the coldest zones many homeowners still pair a heat pump with a gas furnace as a dual-fuel system so the furnace covers the few days a year when it is most efficient to burn gas.
What is a dual-fuel system?
A dual-fuel (hybrid) system pairs a heat-pump-capable outdoor condenser with a gas furnace indoors. The heat pump handles cooling and mild-weather heating on electricity; the furnace takes over on the coldest hours. It is a practical middle path when a working furnace is staying, and it hedges against both high electricity and high gas prices.
How long does a heat pump last compared with a furnace?
Planning figures: gas furnaces last about 15–20 years, central AC 12–15, ducted heat pumps 10–15 (they run year-round for both heating and cooling), and mini-splits 15–20. A furnace-plus-AC pair therefore has two replacement clocks; a heat pump has one machine that wears faster because it works in every season.
Is there still a federal tax credit for a heat pump in 2026?
The federal Section 25C credit for qualifying high-efficiency heat pumps, central AC, and furnaces applied only to systems placed in service on or before December 31, 2025. Under current IRS guidance following the One Big Beautiful Bill Act (July 2025), projects placed in service in 2026 generally do not qualify. State and utility rebates may still apply, so check your local programs. Verify federal eligibility on IRS Form 5695.
Which should you pick?
- Old furnace and AC both dying, cold climate, cheap gas? Compare hard: the combo is familiar and cheapest to run where gas is cheap, but at the same size a heat pump now installs for slightly less — dual-fuel splits the difference.
- Mild winters, or expensive gas / cheap electricity? A heat pump — the higher install can come back on the energy bill over its life.
- Working furnace you want to keep, but need cooling and efficiency? Dual-fuel — add a heat-pump condenser and let the furnace cover the coldest hours.
- No ductwork, or adding heat and cooling to an addition? A ductless mini-split — longer-lived than a ducted heat pump and no duct-replacement bill.
Whichever way you lean, price your exact tonnage, efficiency tier, and duct condition — then check any contractor quote against the band with the built-in bid check:
HVAC replacement calculator →
Sources and assumptions
