Gas Furnace vs Heat Pump: How to Compare Them

A gas furnace and a heat pump both heat a home, but they work on opposite principles, and that difference drives the comparison. A furnace burns fuel to create heat, while a heat pump uses electricity to move heat from outside to inside. This guide sets the two side by side on efficiency, cold-climate performance, and running cost using dated federal sources. Any tax-credit note is caveated, and unverifiable claims are left out.

Two Different Ways to Heat

The core distinction is create versus move. A gas furnace measures its efficiency by AFUE, which ENERGY STAR defines as the percentage of the heat in the incoming fuel which is converted to space heat instead of being lost. Even the best furnace is capped at converting fuel it burns.

A heat pump does not burn fuel to heat. ENERGY STAR explains that a heat pump is so efficient that it can deliver up to three times more heat energy to a home than the electrical energy it consumes, because it transfers existing heat rather than generating it.

That is why the two devices are measured differently and why a heat pump's output can exceed the energy it draws, something no fuel-burning furnace can do.

Efficiency on the Furnace Side

High-efficiency gas furnaces have improved substantially and are the benchmark a heat pump competes with in cold regions. ENERGY STAR requires certified gas furnaces to rate 97 percent AFUE or greater in the U.S. North and 95 percent or greater in the U.S. South.

Those certified units carry real savings over older models. ENERGY STAR states a certified gas furnace in the U.S. North can be up to 18 percent more efficient than a baseline model and save about $160 a year, and in the U.S. South up to 16 percent more efficient for about $60 a year.

The federal minimum is also rising. The DOE finalized a standard requiring an annual fuel utilization efficiency of at least 95 percent for residential furnaces, which pushes the whole market toward condensing efficiency.

Cold-Climate Performance

The old objection to heat pumps was cold weather, and modern cold-climate models directly answer it. ENERGY STAR certification requires third-party verified performance for low temperatures, testing air-source heat pumps down to 5 degrees Fahrenheit.

That testing is meant to give real confidence in winter. ENERGY STAR states the 5 degree testing ensures that a certified heat pump will provide the heat needed to keep a home comfortable all winter.

Some cold-climate units are designed to stand alone. ENERGY STAR describes extended-capacity cold-climate heat pumps as intended to supply enough heat for a home without a furnace or other fossil-fuel heating source, though a furnace still offers a familiar backup where homeowners want one.

Cost, Fuel, and Which to Choose

Running cost depends on the price of gas versus electricity in your area, so the comparison is regional rather than universal. ENERGY STAR notes a heat pump can cost less to operate than traditional equipment such as furnaces, boilers, or electric resistance heat, given its three-to-one heat delivery.

Fuel type also shapes the decision. A gas furnace needs a gas supply and proper venting, while a heat pump runs on electricity alone and provides cooling in summer as the same unit. Homes without gas service often lean toward a heat pump for that reason.

Incentives can change the math, but they change often. ENERGY STAR notes qualifying air-source heat pumps have been eligible for a federal tax credit up to $2,000, though the 25C tax-credit rules changed after 2025, so confirm current eligibility, amounts, and dates directly with the IRS before counting on any credit.