A heat pump and a furnace both keep a house warm, but they get there in fundamentally different ways: one moves heat, the other makes it. That difference shapes efficiency, running cost, air quality, and how each behaves in deep cold.
Two different ways to make heat
Carrier explains that a heat pump uses electricity to move existing heat from the outside air into your home, while a furnace burns fuel such as natural gas, propane, or oil to create heat. Because the heat pump transfers energy instead of burning fuel, it also reverses in summer. Carrier notes a heat pump provides heating in winter and reverses the process to act as an air conditioner in summer, while a furnace only heats. That makes the heat pump a two-in-one system and the furnace a single-season appliance paired with a separate air conditioner.
Efficiency: moving heat beats making it
Moving heat is inherently efficient. ENERGY STAR states that air-source heat pumps deliver up to three times more heat energy than the electrical energy they consume, and that heat pumps are more energy-efficient than a furnace or boiler even during winter. A furnace is capped by combustion. Carrier notes high-efficiency gas furnaces achieve up to 98.5% AFUE, which is excellent for a combustion appliance but still means every unit of fuel yields at most about one unit of heat, whereas a heat pump can yield roughly three.
Cold weather and air quality
Cold performance used to be the furnace's trump card, but that gap has narrowed. Carrier states modern cold climate heat pumps provide efficient heating down to -22F. On air quality, ENERGY STAR notes that no combustion means better indoor air quality because there are no direct emissions, an advantage unique to the heat pump since a furnace burns fuel inside the home. In the coldest climates many homeowners still pair a heat pump with a backup, but a straight furnace is no longer the only option that works in freezing weather.
Installed cost and lifespan
Upfront, furnaces are often cheaper. EnergySage puts a gas furnace between $4,000 and $10,000 and an electric furnace between $2,000 and $7,000, versus a central heat pump around $14,500 ($3,790 per ton) and a ductless system around $26,000 ($9,163 per ton). On longevity, EnergySage reports furnaces last 15 to 20 years and heat pumps around 15 years, partly because a heat pump runs year-round for both heating and cooling. The trade is a higher heat-pump purchase price against its efficiency and its second job as your air conditioner.
Frequently asked questions
Is a heat pump more efficient than a furnace?
Yes. ENERGY STAR states heat pumps deliver up to three times more heat energy than the electricity they use and are more efficient than a furnace or boiler even in winter. A top gas furnace reaches up to 98.5% AFUE.
Do heat pumps work in cold weather?
Modern ones do. Carrier states cold climate heat pumps provide efficient heating down to -22F. In severe climates many homeowners still add a backup heat source.
Which costs more to install?
Heat pumps usually cost more upfront. EnergySage puts gas furnaces at $4,000 to $10,000 versus a central heat pump around $14,500 and a ductless system around $26,000.
Does a heat pump improve air quality?
It can. ENERGY STAR notes no combustion means better indoor air quality because there are no direct emissions, unlike a fuel-burning furnace.
How long does each last?
EnergySage reports furnaces last 15 to 20 years and heat pumps around 15 years, partly because a heat pump runs for both heating and cooling.