Heat Pump vs. Furnace Cost in the US

A heat pump is one outdoor unit that both heats and cools, reversing its refrigerant cycle to pull heat into the house in winter and push it out in summer. Choose it in the calculator and you're pricing a single all-season system. A furnace heats only — to get cooling you pair it with a central air conditioner, which is why the calculator's 'Full system' option prices a furnace, coil, and condenser together rather than a furnace alone.

That scope difference is the root of the comparison. With a heat pump you buy and maintain one piece of outdoor equipment for the whole year; with a furnace-plus-AC setup you have two systems, two sets of components, and two things that can eventually fail. If you only need to replace a dead furnace and your AC is healthy, though, a furnace-only swap is the narrower, cheaper job — the calculator lets you price exactly that instead of a full system.

The cheapest install is almost always the one that reuses what's already there. Replacing a furnace with a furnace, or an AC with an AC, lets the ducts, gas line, electrical connections, and refrigerant routing stay largely in place, so the crew is swapping boxes rather than rebuilding infrastructure. In the calculator, that's the difference between a single-component selection and a full redesign.

Switching to a heat pump can add upfront cost when the home isn't already set up for it. An all-electric heat pump may need an electrical panel or circuit upgrade to carry the load, and a home heated by gas today has no electric heating circuit to inherit. The outdoor unit itself also tends to carry a premium over a cooling-only condenser of the same size, because it has to run a reversing, year-round cycle. A furnace-plus-AC replacement, by contrast, keeps an existing gas home on familiar infrastructure — which is often why its sticker comes in lower on day one.

Heat pumps are remarkably efficient at heating because they move heat instead of creating it — the U.S. Department of Energy notes a modern heat pump can cut electricity use for heating by up to about 75% compared with electric resistance heat like baseboards or an electric furnace. Their heating efficiency is rated in HSPF2 and their cooling in SEER2, and they also dehumidify better than a standard AC in summer. Against an electric furnace, the running-cost case for a heat pump is overwhelming.

Against a gas furnace the math is closer and depends on local prices. A furnace's efficiency is rated in AFUE — a condensing model converts 90% or more of its fuel to heat — and in regions with cheap natural gas, gas heat can be inexpensive to run even at high usage. Where electricity is reasonably priced or gas is dear, a heat pump's efficiency usually wins on operating cost; where gas is cheap and winters are brutal, a furnace can still come out ahead on the heating bill. The honest comparison weighs installed cost and the running cost in your own utility market together, not in isolation.

Climate is the factor that most often settles the choice. In mild and moderate regions a heat pump comfortably carries both seasons on its own and is frequently the efficient default. In genuinely cold climates the question is capacity at the design temperature: a standard heat pump loses output as the air gets colder, which is why cold-climate models — carrying the ENERGY STAR Cold Climate label and engineered to keep heating in temperatures as low as around 5°F — exist specifically for northern homes.

Below a heat pump's effective range, backup heat fills the gap. A common northern setup is a dual-fuel or hybrid system: the heat pump handles efficient heating through the milder months and a gas furnace takes over in deep cold, both sharing the same ductwork. A furnace-plus-AC system sidesteps the cold-weather question entirely, since combustion heat doesn't fade as temperatures drop — which is why it remains a sensible pick where design temperatures are extreme or where reliable backup heat is non-negotiable.

Incentives can meaningfully narrow the upfront gap, and they lean toward heat pumps. The federal Energy Efficient Home Improvement Credit covers 30% of the cost of a qualifying high-efficiency heat pump that meets the current ENERGY STAR tier, and as of 2025 the regional restriction is gone, so homes in any climate can qualify. Many states and utilities stack their own rebates on top — often only for equipment and installers meeting specific standards — so the after-incentive price of a heat pump is frequently far closer to a furnace-plus-AC bid than the sticker suggests. For owners moving away from fossil fuel, a heat pump also consolidates heating and cooling into one electric system.

Put it together this way. Choose a heat pump when your climate, electrical capacity, and ductwork support it and you want one efficient system for all four seasons — especially if you can claim the incentives or you're electrifying the home. Choose furnace-plus-AC when a like-for-like swap keeps the job simple on an existing gas home, when design-temperature extremes make dependable combustion backup essential, or when only one unit has actually failed. Either way, set your conditioned area, system type, efficiency tier, and state in the calculator first, so you're weighing the two against a real number for your house rather than a national average.