Summary: Summary: In 2026 a gas furnace costs $4,500 to $8,000 installed, central AC $5,000 to $9,000, the AC-plus-furnace pair $7,000 to $15,000, and an air-source heat pump $10,000 to $22,000. Heat pumps win on total cost of ownership in moderate climates with average electricity rates, especially with state and utility rebates. Gas wins where gas is cheap and electricity is expensive, and in very cold climates without cold-climate heat pump equipment.
The pair most homeowners compare: central AC plus gas furnace at $7,000 to $15,000 installed versus an air-source heat pump at $10,000 to $22,000. The heat pump premium is $3,000 to $7,000 on day one. But the comparison most people actually need is total system cost: a homeowner replacing a dead AC today ($5,000 to $9,000) will face a furnace replacement ($4,500 to $8,000) within a few years, totaling $9,500 to $17,000 across two projects.
A heat pump replaces both boxes with one: heating and cooling from a single system. Compared against the two-project total, heat pumps are price-competitive before incentives, and state plus utility rebates (up to $8,000 for income-qualified households in some programs) can make them decisively cheaper. Always compare the heat pump quote against both replacements, not just the AC.
Heat pumps move heat rather than making it, delivering 2 to 4 units of heat per unit of electricity (more in mild weather, less in deep cold). At $0.15 per kWh electricity and $1.20 per therm gas, a heat pump typically heats cheaper than an 80-percent furnace and roughly ties a 95-percent furnace. The crossover moves with your local rates: cheap gas plus expensive electricity favors the furnace.
Cooling costs are similar between a heat pump and a central AC of equal SEER2: the equipment is fundamentally the same in cooling mode. The operating-cost difference lives almost entirely in heating season. Ask each bidder to model annual operating cost at your actual utility rates: reputable contractors do this routinely, and the answer is specific to your house and your rates, not to national averages.
Heat pumps shine in moderate climates (roughly zones 1 through 4): mild winters keep efficiency high and the single-system simplicity pays off. In cold climates (zones 5 through 7), standard heat pumps lose capacity and efficiency below about 30 degrees; cold-climate models work to 5 degrees or below but cost $14,000 to $28,000. Dual-fuel (heat pump plus gas furnace backup) is the sophisticated answer for cold climates with cheap gas: the heat pump handles mild weather efficiently and the furnace takes over in deep cold.
Straight gas furnace plus AC remains the pragmatic choice where natural gas is cheap and electricity is $0.20-plus per kWh, and where the home already has gas infrastructure. There is no shame in the conventional answer: the best system is the one matched to your climate, your rates, and your existing infrastructure.
Gas furnaces last 18 to 25 years (the heat exchanger is the limiter), central AC condensers 12 to 18 years, air-source heat pumps 12 to 16 years (15 to 20 for variable-speed inverter models). The heat pump works year-round, so it accumulates runtime faster: expect to replace it sooner than a furnace, roughly on the AC's schedule rather than the furnace's.
Maintenance is similar across systems: annual professional service ($150 to $300), monthly filter checks, and keeping the outdoor unit clear. Heat pumps need their outdoor coil kept clear of snow and ice in winter. None of the systems is maintenance-free, and skipped maintenance voids warranties faster than any brand difference.
Choose the heat pump if you are in a moderate climate, your electricity rates are reasonable, you value the single-system simplicity, or available rebates are strong: in 2026, state and utility heat pump rebates are the richest incentives in residential HVAC. Choose AC plus gas furnace if gas is cheap, electricity is expensive, or you are in a very cold climate without cold-climate heat pump budget.
Choose dual-fuel if you want heat pump efficiency most of the year with gas backup for the coldest weeks. Whatever you choose, get the Manual J load calculation, compare AHRI-rated efficiency numbers, and weight the installer's quality at least as heavily as the equipment brand: installation quality decides real-world efficiency and lifespan more than the nameplate.
Data current as of October 2026. Sources: contractor pricing data and manufacturer guidance. Estimates only, not a quote. Always get multiple written quotes from licensed local HVAC contractors.