The choice between a heat pump and a gas furnace is the single most consequential HVAC decision a homeowner makes, and it has changed substantially in the last five years. Heat pump technology has improved sharply in cold-climate performance, federal tax credits have shifted the up-front math, and electricity prices relative to natural gas have moved meaningfully in some markets. None of this is reflected in conventional wisdom from a decade ago, which is worth setting aside.
How each system actually works
A gas furnace burns natural gas (or propane) inside a sealed combustion chamber. The heat from the combustion is transferred to indoor air through a heat exchanger. Combustion byproducts are vented outside through a flue. Efficiency is measured by AFUE (Annual Fuel Utilization Efficiency), which represents the fraction of the fuel's energy that ends up as useful heat. Modern condensing furnaces are typically 92 to 98 percent AFUE.
A heat pump moves heat rather than generating it. In winter, it extracts heat from outdoor air (yes, even cold outdoor air contains a great deal of heat) and pumps it indoors. In summer, the cycle reverses and the same unit functions as an air conditioner. Because the system is moving heat rather than burning fuel, it produces two to four units of heat for every unit of electricity it consumes. Efficiency is measured by HSPF (Heating Seasonal Performance Factor) for heating and SEER2 for cooling.
The climate question
The conventional wisdom that heat pumps are inappropriate for cold climates is now substantially outdated. Cold-climate heat pumps from major manufacturers are rated to deliver full heating capacity down to 5°F outdoor temperature, with continued (reduced) capacity to -15°F or lower. In climates like New England, the upper Midwest, and the Rockies, heat pumps now perform credibly through the heating season, often paired with a small electric or gas backup for the coldest days.
In moderate climates — the mid-Atlantic, Pacific Northwest, the South, and most of California — heat pumps are now generally the better choice on both cost and performance grounds. The marginal case is the deep cold of northern Maine, North Dakota, Montana, and similar climates, where the answer depends on local electricity rates and the specific equipment selected.
The fuel-cost question
A heat pump consumes electricity. A gas furnace consumes natural gas. The relevant comparison is not the price per therm versus price per kilowatt-hour — the units differ — but the cost to deliver a given amount of heat to the house.
A rough way to compare: at a 95 percent efficient gas furnace and a heat pump with a coefficient of performance (COP) of 3.0, the heat pump uses about one-third as much energy to deliver the same heat. If electricity costs three times as much per equivalent unit of energy as natural gas, the costs are roughly equal. If electricity is cheaper than that ratio (relative to gas), the heat pump wins. If electricity is more expensive, the furnace wins.
In most American markets in 2026, this math now favors heat pumps, sometimes substantially. The historical pattern of "gas is always cheaper" no longer holds in many regions. Pull a current gas bill and a current electric bill before assuming.
The capital-cost question
A gas furnace replacement typically runs $4,000 to $8,000 installed. A new central air conditioner runs $4,000 to $8,000. Together, $8,000 to $16,000.
A heat pump replaces both functions in a single piece of equipment. Installed cost typically runs $7,000 to $14,000 for a cold-climate-capable unit. Apples to apples (heat pump versus furnace + AC), the heat pump is often the cheaper installation, before incentives.
The incentive question, as of 2026
The federal Inflation Reduction Act (IRA) of 2022 introduced significant heat pump incentives that remain in effect. The 25C tax credit covers 30 percent of equipment and installation cost, up to $2,000, for qualifying heat pumps installed in a primary residence. The High-Efficiency Electric Home Rebate Act (HEEHRA) provides up to $8,000 for heat pump installation for income-eligible households, administered through state energy offices on rolling timelines.
State and utility rebates add further to this. In some markets, the combined incentives now cover the majority of the heat pump's installed cost. For a fuller treatment of the available incentives and how to capture them, see HVAC Tax Credits and Rebates.
When a furnace is still the right choice
A gas furnace is still the better answer when:
- The home is in a very cold climate with extremely cheap natural gas (less common than it used to be)
- The home has an undersized electrical service that cannot accommodate a heat pump without an expensive panel or service upgrade
- The existing furnace is relatively new and the homeowner is only addressing a failed air conditioner
- The home is connected to a stable, low-cost natural gas supply and the homeowner does not place value on the carbon-emissions reduction of switching
What to ask a contractor
Two questions tell you a great deal about an HVAC contractor's expertise with heat pumps.
The first is whether they will perform a Manual J load calculation — an actual room-by-room measurement of heating and cooling loads based on the home's construction, orientation, insulation, and windows. Sizing a heat pump by rule of thumb (typically "one ton per 500 square feet") will substantially oversize most homes, which hurts efficiency and comfort. Manual J is the standard. A contractor who declines to perform one is not selling you a heat pump installation; they are selling you a heat pump. For more on this, see Sizing HVAC: Why Bigger Is Almost Always Worse.
The second is whether they will install a cold-climate-rated heat pump if you live in a climate where cold-weather performance matters. Standard heat pumps lose substantial capacity below 35°F. Cold-climate-rated units (sometimes labeled "CC" or "Hyper-Heat" or "Heat Pump for Cold Climates," depending on the manufacturer) maintain capacity to much lower temperatures. The price difference is modest; the performance difference in February is not.
The single most useful comparison
Before you finalize a decision, ask your contractor for an apples-to-apples 15-year operating cost projection: equipment + installation + estimated annual energy + estimated maintenance for both options. Quality contractors do this routinely. It is the only honest way to compare.
For more on when an HVAC system actually needs replacement and how to know it, see When to Replace HVAC Equipment.
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