PowerLab

Home Electrification & Heating Economics

Heat Pump Running Cost Calculator

Compare seasonal operating costs between an electric air-source heat pump and natural gas, propane, or heating oil furnaces using delivered thermal demand, seasonal COP assumptions, and local fuel prices.

Compare Heat Pump vs. Combustion Heating Costs

⚡ 1-Click Autofill: Illustrative Scenarios

📍 Regional Climate & Reference Energy Rates

Select your state to load representative ASHRAE 99% winter design temperatures and illustrative EIA residential electricity rates.

❄️ ASHRAE 99% Winter
44.2°F DB
🔥 ASHRAE 1% Summer
86.2°F DB
⚡ EIA Reference Rate
$0.315 /kWh

Reference data: NREL NSRDB & EIA Form EIA-861 benchmarks (reference data — not a live utility tariff).

Calculations run in your browser•No sign-up required•Instant client-side model
Heating Demand & Heat Pump Seasonal Efficiency

*Simplified seasonal COP used for planning. Actual operating COP varies with outdoor dry-bulb temperatures and auxiliary heat engagement.

Baseline Heating System & Fuel Price

How to Compare Heat Pump vs Furnace Heating Costs

  1. Select Heat Pump Efficiency (COP): Enter your system's simplified seasonal COP. Modern cold-climate inverter heat pumps deliver seasonal COP values between 2.5 and 3.5 (corresponding to approximately 8.5 to 11.5 HSPF2).
  2. Choose Comparison Fossil Fuel: Select natural gas ($/Therm), delivered propane ($/gal), heating oil ($/gal), or electric resistance baseboards ($/kWh) to compare against your baseline.
  3. Set Annual Heating Thermal Demand: Enter your home's annual heating load scenario (e.g. 50 MMBTU for a standard residential scenario).
  4. Analyze the Break-Even Rate: The calculator estimates the break-even electricity rate ($/kWh) below which heating with your heat pump is projected to cost less than your baseline combustion heating system.

DOE Appendix M1: HSPF vs. HSPF2 Rating Transition Matrix

Effective January 1, 2023, the U.S. Department of Energy (DOE 10 CFR Part 430 Appendix M1) mandated HSPF2 (Heating Seasonal Performance Factor 2) to replace legacy HSPF metrics. The primary engineering change is testing blowers under 0.50 inches of water column (in. w.c.) external static pressure (ESP), compared to 0.15 to 0.20 in. w.c. in legacy Appendix M testing.

Because real residential duct systems create static pressure, testing against 0.50 in. w.c. increases blower power consumption and reduces measured airflow. In Region IV, HSPF2 is approximately 15% lower than legacy HSPF for the exact same physical equipment.

DOE Appendix M1 heating efficiency transition and seasonal COP equivalence
Efficiency TierLegacy Rating (App. M)Modern Rating (App. M1)Testing ESPEquivalent Seasonal COPStandard / Code Tier
DOE 2023 National Minimum8.8 HSPF7.5 HSPF20.50 in. WG2.20 COPMandatory U.S. baseline for split systems
High-Efficiency Standard9.5–10.0 HSPF8.1–8.5 HSPF20.50 in. WG2.37–2.49 COPENERGY STAR v6.1 baseline
Cold-Climate Inverter Tier10.5–11.5 HSPF9.0–9.8 HSPF20.50 in. WG2.64–2.87 COPENERGY STAR Cold Climate specification
Premium Ultra-Efficient Inverter12.0–13.5+ HSPF10.2–11.5+ HSPF20.50 in. WG2.99–3.37+ COPHigh-performance mini-splits and advanced systems

*Seasonal COP equivalence is calculated using the relationship: COP = HSPF2 ÷ 3.412142. Actual operating COP varies with outdoor dry-bulb temperatures.

Annual Heating Bill Comparison by Fuel Type

Representative annual operating costs for heating a 50 MMBTU/year illustrative heating-demand scenario, evaluated at illustrative U.S. residential fuel price benchmarks:

Residential heating system operating costs, fuel consumption, and estimated differences
Heating Fuel SystemEfficiency MetricFuel Energy NeededReference Fuel PriceAnnual Costvs Heat Pump
Cold-Climate Inverter Heat PumpCOP 3.20 (approx. 11.0 HSPF2)4,579 kWh$0.1834 / kWh$840 / yrBaseline
Standard Inverter Heat PumpCOP 2.80 (approx. 9.5 HSPF2)5,233 kWh$0.1834 / kWh$960 / yr+$120 / yr
High-Efficiency Natural Gas Furnace96% AFUE521 Therms$1.45 / Therm$755 / yrSave $85 / yr
Standard Natural Gas Furnace80% AFUE625 Therms$1.45 / Therm$906 / yr+$66 / yr
Propane Gas Furnace80% AFUE683 Gallons$3.20 / Gallon$2,186 / yrSave $1,346 / yr
Heating Oil Boiler / Furnace80% AFUE451 Gallons$4.10 / Gallon$1,850 / yrSave $1,010 / yr
Electric Resistance Baseboards100% (COP 1.00)14,654 kWh$0.1834 / kWh$2,688 / yrSave $1,848 / yr

Illustrative Modeled Heat Pump Electrical Input by Tonnage

Electrical input scales with compressor capacity, efficiency, and outdoor temperatures. The table below illustrates modeled electrical power demand and running costs evaluated at an illustrative benchmark of 18.34¢/kWh ($0.1834/kWh):

Illustrative modeled electrical power demand and operating cost by capacity rating
Capacity RatingIllustrative Scenario AreaMild Modeled Input (COP 3.2)Mild Cost / Run HrCold Modeled Input (COP 2.0)Cold Cost / Run HrWith Auxiliary Heat Active
1.5 Ton (18,000 BTU/h)800–1,100 sq ft1.65 kW$0.30 / hr2.64 kW$0.48 / hr7.64 kW ($1.40 / hr)
2.0 Ton (24,000 BTU/h)1,100–1,400 sq ft2.20 kW$0.40 / hr3.52 kW$0.65 / hr8.52 kW ($1.56 / hr)
2.5 Ton (30,000 BTU/h)1,400–1,800 sq ft2.75 kW$0.50 / hr4.40 kW$0.81 / hr9.40 kW ($1.72 / hr)
3.0 Ton (36,000 BTU/h)1,800–2,200 sq ft3.30 kW$0.61 / hr5.28 kW$0.97 / hr10.28 kW ($1.89 / hr)
3.5 Ton (42,000 BTU/h)2,200–2,600 sq ft3.85 kW$0.71 / hr6.15 kW$1.13 / hr11.15 kW ($2.04 / hr)
4.0 Ton (48,000 BTU/h)2,600–3,000 sq ft4.40 kW$0.81 / hr7.03 kW$1.29 / hr17.03 kW* ($3.12 / hr)
5.0 Ton (60,000 BTU/h)3,000–3,800+ sq ft5.50 kW$1.01 / hr8.79 kW$1.61 / hr18.79 kW* ($3.45 / hr)

*Note: 4.0-ton and 5.0-ton scenarios reflect an illustrative 10 kW auxiliary resistance heat assumption (drawing 10,000 W supplemental input during extreme weather or recovery cycles), compared to 5 kW for smaller capacities.

Heating Fuel Equivalence & Calculation Formulas

Deterministic thermodynamic energy balance modeling electric heat pump COP, combustion furnace AFUE, and delivered fuel heating values.

AnnualCost=(DeliveredBTU, Demand(FuelEnergy, Density × Efficiency)) × FuelPrice

Variable Definitions

Delivered_BTU_DemandDelivered Thermal Heating Load(BTU/year)
Total seasonal heat energy required by the building envelope (e.g. 50M BTU for standard scenario)
COPCoefficient of Performance(dimensionless)
Heat pump thermal multiplier (e.g. 3.0 COP delivers 3.0 units of heat per 1.0 unit of electricity)
AFUEAnnual Fuel Utilization Efficiency(%)
Combustion efficiency percentage of furnace or boiler (e.g. 80% standard vs 96% condensing)
Break_Even_RateBreak-Even Electricity Price($/kWh)
Estimated electricity price ($/kWh) where heat pump operating cost matches baseline fuel cost

Calculation Notes

  • 1 kWh electricity delivers 3,412.142 BTU of thermal energy at 1.0 COP.
  • 1 Therm of natural gas contains 100,000 BTU gross heating value (HHV).
  • 1 Gallon of propane contains 91,500 BTU; 1 Gallon of #2 fuel oil contains 138,500 BTU.
  • Natural Gas Break-Even: BreakEven ($/kWh) = (Gas_Price_per_Therm / 100,000) × 3,412.142 × (COP / AFUE).
  • Propane Break-Even: BreakEven ($/kWh) = (Propane_Price_per_Gallon / 91,500) × 3,412.142 × (COP / AFUE).
  • Heating Oil Break-Even: BreakEven ($/kWh) = (Oil_Price_per_Gallon / 138,500) × 3,412.142 × (COP / AFUE).
  • Electric Resistance Break-Even: BreakEven ($/kWh) = Baseboard_Electricity_Rate × COP.

Frequently Asked Questions (FAQ)

Is a heat pump cheaper to run than a natural gas furnace?
Whether a heat pump costs less to run than a natural gas furnace depends on local utility rates, furnace efficiency, and seasonal climate. Heat pumps deliver heat at a seasonal Coefficient of Performance (COP) typically between 2.5 and 3.8 (delivering 2.5 to 3.8 units of heat per unit of electricity consumed). In regions with moderate electricity rates ($0.12 to $0.18/kWh) and typical natural gas tariffs ($1.30 to $1.60/therm), heat pumps and modern 80%–96% gas furnaces have comparable annual operating costs. When replacing delivered propane ($3.20/gal) or heating oil ($4.10/gal), heat pumps typically offer substantial annual operating savings depending on heating demand and local prices.
What is the difference between HSPF and HSPF2 ratings?
HSPF2 (Heating Seasonal Performance Factor 2) is the Department of Energy test standard mandated under 10 CFR Part 430 Appendix M1. Unlike legacy HSPF (Appendix M) which tested blowers against an external static pressure (ESP) of 0.15 to 0.20 inches of water column (in. w.c.), HSPF2 tests at 0.50 in. w.c. to reflect real-world residential ductwork resistance. As a result, HSPF2 ratings are approximately 15% lower than legacy HSPF numbers for the exact same physical equipment (e.g., 8.8 HSPF ≈ 7.5 HSPF2 in Region IV).
How much does an electric heat pump cost to run per hour?
At an illustrative reference rate of 18.34¢/kWh ($0.1834/kWh), a 3-ton (36,000 BTU/h) heat pump drawing an illustrative 3.30 kW in mild heating weather (COP 3.2) costs approximately $0.61 per continuous run hour. In freezing weather (COP 2.0), compressor power demand increases to approximately 5.28 kW ($0.97/hr). If an illustrative 10 kW supplemental electric resistance heat kit activates during severe cold snaps, total power draw reaches approximately 15.28 kW, costing about $2.80 per continuous hour. Actual input depends on equipment model, ambient temperature, and defrost cycles.
What is COP and how does it relate to outdoor temperature?
COP (Coefficient of Performance) measures thermal heat energy delivered divided by electrical energy consumed. A COP of 3.0 means 3.0 units of heat delivered per 1.0 unit of electricity consumed. In sub-freezing air, lower ambient vapor density decreases refrigerant mass flow, reducing compressor capacity and COP. In illustrative AHRI test conditions, standard single-stage heat pumps drop from approximately COP 3.4 at 47°F to COP 1.3 at 0°F, while cold-climate inverter heat pumps (ccASHP) with variable-speed compressors maintain approximately COP 1.8 to 2.2 at 0°F and operate into sub-zero conditions.
What is a heat pump's thermal balance point?
The thermal balance point is the outdoor ambient temperature where a home's heat loss rate matches the maximum heating capacity of the heat pump. Above this temperature, the heat pump meets the heating load without assistance. Below this temperature, supplemental heat (such as electric resistance strips or a dual-fuel combustion furnace) stages on to satisfy indoor thermostat demand.
What is the break-even electricity rate for a heat pump vs natural gas?
The break-even rate is the estimated electricity price ($/kWh) where heating with a heat pump costs the same as heating with combustion fuel. For natural gas, the formula is: Break-Even ($/kWh) = (Gas Price per Therm ÷ 100,000 BTU) × 3,412.142 BTU/kWh × (Heat Pump COP ÷ Furnace AFUE). If natural gas costs $1.45/Therm with an 80% AFUE furnace and your heat pump operates at COP 3.0, the break-even electricity rate is ($1.45 ÷ 100,000) × 3,412.142 × (3.0 ÷ 0.80) ≈ $0.1855/kWh (18.5¢/kWh). If your electricity tariff is below 18.5¢/kWh, the heat pump is estimated to cost less to run.

Technical References & Model Basis

Heating calculations use deterministic thermodynamic conversions (3,412.142 BTU per kWh), fuel higher heating values, and user-entered efficiency and tariff inputs. See our methodology and sources.

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Engineering Standards & Technical Methodology References

Calculations, electrical losses, and design safety margins adhere to recognized engineering guidelines:

NEC Article 220Branch-Circuit, Feeder, and Service Load Calculations• National Electrical Code (NFPA 70)

Authoritative demand factors and continuous load ratings for residential electrical services.

ANSI / ASHRAE 90.2Energy-Efficient Design of Low-Rise Residential Buildings• ASHRAE

Baseline energy modeling standards for residential appliance loads, HVAC, and thermal envelopes.

ENERGY STAR V8Appliance Energy Efficiency Criteria• U.S. Environmental Protection Agency (EPA)

Standardized duty-cycle consumption benchmarks for residential refrigeration, laundry, and computing.