Which Is Cheaper to Run: Heat Pump or Gas Furnace

The choice between a heat pump and a gas furnace depends on fuel prices, system efficiency, local climate, and home characteristics. This article compares operating costs, performance metrics, incentives, and lifecycle expenses so readers can evaluate which option is more economical and practical for typical U.S. homes.

Factor	Heat Pump	Gas Furnace
Typical Efficiency Metric	HSPF/SEER, COP (1.5–3.5 COP in heating)	AFUE (80%–98%)
Primary Fuel	Electricity	Natural Gas / Propane
Best Climate	Mild to Moderate Cold	Cold Climates
Typical Operating Cost	Often lower where electricity is cheap or heat pump is high-efficiency	Often lower where natural gas is very cheap
Carbon Emissions	Lower If Grid Is Clean	Higher Direct Combustion Emissions

How Efficiency Is Measured

Understanding efficiency metrics is essential to compare operating costs. Heat pumps use Coefficient Of Performance (COP) in heating and Seasonal Energy Efficiency Ratio (SEER) for cooling. COP indicates how many units of heat are delivered per unit of electricity; a COP of 3 means 3 units of heat per 1 unit of electricity. Heat pump efficiency varies with outdoor temperature.

Gas furnaces are rated by Annual Fuel Utilization Efficiency (AFUE), the percentage of fuel converted to useful heat. An AFUE of 95% means 95% of the gas energy becomes indoor heat; the rest is lost in exhaust and standby losses.

How To Compare Running Costs

To compare running costs, convert efficiencies and fuel prices to a common unit of useful heat, typically dollars per million British Thermal Units (MMBtu) or dollars per kWh equivalent. This method accounts for both energy price and equipment efficiency.

A practical formula: Operating Cost Per Useful Unit = (Fuel Price Per Energy Unit) / (System Efficiency). For electricity, include the heat pump’s COP or HSPF; for gas, use AFUE and the gas price per therm or MMBtu.

Example Calculation

Assume: Electricity price $0.15/kWh, Natural gas $1.20/therm (1 therm ≈ 29.3 kWh), Heat pump COP 2.8 average in heating season, Gas furnace AFUE 95%.

Convert gas price to kWh equivalent: $1.20/therm ÷ 29.3 kWh/therm = $0.0409 per kWh (fuel). Adjust for AFUE: $0.0409/0.95 = $0.043 per useful kWh. For heat pump: $0.15 per kWh ÷ 2.8 COP = $0.0536 per useful kWh. In this case, the gas furnace is cheaper to run.

Changing assumptions (lower electricity price, higher COP, or higher gas price) can flip the result. This illustrates sensitivity to local rates and system performance.

Climate And Performance Considerations

Climate impacts heat pump performance strongly. Traditional air-source heat pumps lose efficiency as outdoor temperature drops because they extract heat from colder air. Modern cold-climate heat pumps retain higher COPs at lower temperatures due to improved compressors and refrigerants.

In milder climates, heat pumps usually provide the lowest operating costs because they deliver multiple units of heat per unit of electricity and also provide efficient cooling. In very cold climates, a gas furnace or a hybrid system (heat pump + gas furnace) often has lower operating costs and better comfort during extreme cold.

Electric Rates, Time-Of-Use, And Demand Charges

Electricity pricing can significantly affect heat pump economics. Areas with low residential rates or renewable-heavy grids may favor heat pumps. Time-of-use (TOU) rates can lower running costs if heating can be shifted to off-peak hours, or if a heat pump is paired with thermal storage or smart controls.

Large commercial or multifamily buildings may face demand charges that increase electric heating costs, making gas more competitive in those contexts.

Installation, Maintenance, And Lifespan Costs

Operating cost is only part of the financial picture. Installation costs for heat pumps, especially ductless mini-splits or cold-climate models, can be higher than a standard gas furnace. Conversely, replacing an old furnace with a high-efficiency gas model also entails significant expense.

Maintenance differs: gas furnaces require annual inspection of burners, venting, and combustion safety. Heat pumps need refrigerant checks, coil cleaning, and occasional compressor work. Lifespans: modern furnaces often last 15–20 years; heat pumps typically last 10–15 years depending on use and maintenance.

Incentives, Rebates, And Tax Credits

Federal, state, and utility incentives can shift the cost calculus. The U.S. Inflation Reduction Act and various state programs have expanded rebates and tax credits for high-efficiency heat pumps and electrification, lowering upfront costs.

Utilities may offer rebates for heat pump installations, especially for heat-pump water heaters or building electrification pilots. Gas utilities sometimes offer incentives for high-efficiency furnaces and emissions-reduction programs.

Carbon Emissions And Policy Trends

From a carbon perspective, heat pumps often produce fewer emissions over their lifetime when the electric grid has lower carbon intensity or continues to decarbonize. Gas furnaces emit CO2 directly through combustion. Long-term policy trends favor electrification and grid decarbonization, increasing the environmental case for heat pumps.

When A Hybrid System Makes Sense

Dual-fuel or hybrid systems combine a heat pump with a gas furnace. The system uses the heat pump at mild temperatures for high efficiency and switches to the gas furnace during extreme cold to maintain comfort and lower peak electric loads.

This approach can deliver best-of-both-worlds economics in homes located in colder climates where electric prices are high or where the heat pump’s COP drops significantly in winter.

Practical Steps To Decide For A Specific Home

1. Collect Local Energy Prices: Get current electricity ($/kWh) and gas ($/therm or $/MMBtu) rates from utility bills.
2. Estimate Efficiency: Use estimated COP for heat pump and AFUE for gas furnace based on equipment models.
3. Calculate Cost Per Useful Heat Unit: Convert fuel prices to comparable units and apply efficiency to find operating cost per useful kWh or per MMBtu equivalent.
4. Consider Climate: Review expected winter low temperatures and seasonal heating needs.
5. Factor Installation And Incentives: Add upfront costs minus rebates and tax credits to evaluate payback and lifecycle cost.
6. Include Maintenance And Lifespan: Estimate annual maintenance and expected replacement timelines.

Real-World Cost Example Scenarios

Scenario A — Mild Climate, Clean Grid: Electricity $0.12/kWh, heat pump COP 3.2 average. Gas $1.00/therm, AFUE 90%. Heat pump cost per useful kWh = $0.0375; gas cost per useful kWh ≈ $0.038 per kWh equivalent. Heat pump slightly cheaper and has lower emissions if grid mix is clean.

Scenario B — Cold Climate, Cheap Gas: Electricity $0.16/kWh, heat pump COP 2.2 average, Gas $1.35/therm, AFUE 95%. Heat pump cost per useful kWh = $0.0727; gas cost per useful kWh ≈ $0.046. Gas furnace is notably cheaper in operation.

Other Factors: Ductwork, Indoor Air Quality, And Zoning

Ducted systems lose heat through poorly sealed ducts, affecting running costs for both technologies. Ductless mini-split heat pumps can avoid duct losses and enable room-by-room zoning, improving comfort and lowering energy use for partial-home heating.

Indoor air quality considerations differ: gas furnaces involve combustion and venting concerns, which require proper ventilation and carbon monoxide safety measures. Electric heat pumps avoid on-site combustion risks.

Key Takeaways For U.S. Homeowners

• There Is No Universal Answer: Operating cost depends on local electricity and gas prices, system efficiencies, and climate.
• Mild Climates Favor Heat Pumps: Heat pumps typically cost less to run and also cool efficiently.
• Very Cold Climates May Favor Gas: In extreme cold with cheap gas, furnaces can be cheaper to run unless a cold-climate heat pump is used or a hybrid system is installed.
• Incentives Matter: Rebates and tax credits can make heat pumps economically attractive despite higher upfront cost.
• Long-Term Trend: Electrification and grid decarbonization improve the long-term economics and environmental benefits of heat pumps.

Resources And Tools To Model Costs

Homeowners can use online calculators from the Department of Energy, local utility rate pages, and manufacturer sizing tools to estimate seasonal performance. Energy auditors and HVAC contractors can provide load calculations and tailor comparisons using actual home characteristics.

Reliable sources include the U.S. Department of Energy (energy.gov), state energy offices, and reputable HVAC industry resources for efficiency ratings and sizing guidance.