Gas vs Electric Heating Calculator - Annual Cost Comparison

Three heating systems, one annual bill

Gas furnace, electric heater and heat pump all keep a house warm, but the annual cost can differ by thousands of dollars. The gap depends on your local gas and electricity rates, the size and insulation level of your home, and the efficiency of each system. This calculator puts all three options on the same page. Enter your heated area, insulation standard, gas price per cubic meter, electricity price per kilowatt-hour and the type of electric heating you are considering. In seconds you get a side-by-side comparison of annual and monthly costs for every option, a detailed breakdown table, and a scenario grid that ranks gas boiler, electric heater, air-source heat pump and ground-source heat pump from cheapest to most expensive. The math runs on real energy balance: heat demand in kWh per year (based on floor area and insulation), divided by each system's efficiency or COP, multiplied by the fuel or electricity price.

How to use this calculator - step by step

Enter your heated area - the usable floor space you heat in winter, in square meters. Apartments typically range from 40 to 80 m2, detached houses from 80 to 200 m2.
Select insulation standard - choose "New / well insulated" for homes built after 2015 with modern insulation (60-80 kWh/m2/yr), "Moderately insulated" for 1990-2010 construction (100-130 kWh/m2/yr) or "Poorly insulated / old" for pre-1990 homes without upgrades (150-200 kWh/m2/yr).
Enter the gas price - your natural gas rate per cubic meter from the utility bill. US averages range from about $0.40/m3 in the South to $1.20/m3 in the Northeast.
Set boiler efficiency - leave blank for the default 92% (modern condensing boiler). Enter 75-85% for an older atmospheric unit or up to 108% for a high-end condensing model.
Enter the electricity price - your rate per kilowatt-hour including delivery charges. US averages run from $0.12/kWh to $0.25/kWh depending on state and utility.
Select the electric heating type - pick the system you want to compare against gas. Electric heater/convector has COP 1, air-source heat pump COP 3-4, ground-source heat pump COP 4-5, storage heater COP 1.
Optional: enter a custom COP - if you know the rated COP of your heat pump from the manufacturer's data sheet, enter it here. It overrides the default for more precise results.
Click "Compare costs" - review the annual difference, side-by-side cards, detailed comparison table and the full scenario grid.

COP and efficiency explained

Heating system	Efficiency / COP	What it means	Typical install cost
Gas boiler (condensing)	92-108%	Recovers heat from flue gases, so rated efficiency can exceed 100% on lower heating value basis	$3,000 - $7,000
Gas boiler (old atmospheric)	75-85%	15-25% of gas energy goes up the chimney as waste heat	N/A (legacy)
Electric heater / convector	COP 1.0	1 kWh electricity produces exactly 1 kWh of heat, no multiplier	$200 - $1,500
Air-source heat pump	COP 3.0 - 4.0	Moves 3-4 kWh of heat per 1 kWh of electricity by extracting warmth from outdoor air	$8,000 - $15,000
Ground-source heat pump	COP 4.0 - 5.0	Extracts heat from underground where temperature stays stable year-round, highest COP but most expensive to install	$15,000 - $30,000

Install costs are US averages for a typical single-family home. Federal tax credits and local rebates can reduce heat pump costs by 30% or more.

Annual heating cost scenarios

Scenario	Gas boiler	Electric heater	Air-source HP	Ground-source HP
100 m2, well insulated	$450	$1,050	$300	$233
150 m2, moderate insulation	$1,100	$2,588	$739	$575
200 m2, moderate insulation	$1,467	$3,450	$986	$767
150 m2, poorly insulated	$1,672	$3,938	$1,125	$875
250 m2, poorly insulated	$2,787	$6,563	$1,875	$1,458

Calculated at $0.75/m3 gas, 92% boiler efficiency, $0.15/kWh electricity. Air-source COP 3.5, ground-source COP 4.5. Your actual costs depend on local energy prices.

Practical examples

Example 1: Small well-insulated home
Area: 80 m2, insulation: new (70 kWh/m2/yr)
Gas: $0.80/m3, boiler 92%. Electricity: $0.14/kWh, air-source HP
Gas cost: $371/yr. Heat pump cost: $224/yr
Heat pump saves $147/year (40% less)

Example 2: Mid-size home, moderate insulation
Area: 150 m2, insulation: moderate (115 kWh/m2/yr)
Gas: $0.70/m3, boiler 92%. Electricity: $0.18/kWh, electric heater
Gas cost: $936/yr. Electric heater cost: $3,105/yr
Gas saves $2,169/year (70% less)

Example 3: Old poorly insulated house
Area: 200 m2, insulation: poor (175 kWh/m2/yr)
Gas: $0.90/m3, boiler 85%. Electricity: $0.15/kWh, ground-source HP
Gas cost: $2,662/yr. Ground-source HP cost: $1,167/yr
Ground-source HP saves $1,495/year (56% less)

Example 4: Apartment with electric convector
Area: 55 m2, insulation: moderate (115 kWh/m2/yr)
Gas: $1.10/m3, boiler 92%. Electricity: $0.12/kWh, electric heater
Gas cost: $596/yr. Electric heater cost: $759/yr
Gas saves $163/year (21% less)

Example 5: Large home, cheap electricity
Area: 250 m2, insulation: new (70 kWh/m2/yr)
Gas: $0.85/m3, boiler 95%. Electricity: $0.10/kWh, air-source HP
Gas cost: $1,108/yr. Air-source HP cost: $500/yr
Heat pump saves $608/year (55% less)

FAQ

Is a heat pump always cheaper than a gas furnace?

Not always. The answer depends on the ratio of electricity price to gas price in your area and the heat pump's seasonal COP. As a rule of thumb, if your electricity rate is less than about 3 times the equivalent gas rate per kWh of heat, an air-source heat pump (COP 3-4) will be cheaper to operate. In regions where gas is very cheap and electricity is expensive, gas can still win on running costs. However, heat pumps are gaining ground thanks to federal tax credits (up to 30% of install cost through the Inflation Reduction Act), rising gas prices and improving cold-climate heat pump technology that maintains COP above 2.0 even at sub-zero temperatures.

What is COP and why does it matter?

COP stands for Coefficient of Performance. It measures how many kilowatt-hours of heat a device produces per one kilowatt-hour of electricity consumed. A basic electric heater has COP 1.0 - every watt of electricity becomes exactly one watt of heat. A heat pump achieves COP 3-5 by moving heat from outside air or ground into your home rather than generating it from scratch. This means a heat pump with COP 3.5 produces 3.5 kWh of heat for every 1 kWh of electricity, making it 3.5 times more efficient than a simple heater. COP varies with outdoor temperature: it drops in colder weather because there is less heat to extract from the air.

How does insulation affect heating costs?

Insulation is one of the biggest cost drivers. A well-insulated modern home needs about 60-80 kWh per square meter per year of heat, while a poorly insulated older home may need 150-200 kWh/m2/yr - more than double. For a 150 m2 house, that is the difference between 10,500 kWh and 26,250 kWh of annual heat demand. Upgrading insulation (attic, walls, windows) often delivers the best return on investment of any energy measure. Before choosing between gas and electric heating, check whether insulation upgrades could cut your heat demand by 30-50%, which reduces costs regardless of fuel type.

What does boiler efficiency above 100% mean?

A condensing gas boiler can achieve rated efficiency of 92-108% because efficiency is measured against the lower heating value (LHV) of natural gas, which does not include the energy in water vapor from combustion. Condensing boilers recover some of that latent heat by cooling the exhaust gases until the water vapor condenses. This recovered energy pushes the measured efficiency above 100% on the LHV scale. In practical terms, a 105% condensing boiler extracts about 15-20% more usable heat from the same amount of gas compared to an old 85% atmospheric boiler.

Should I factor in installation cost when comparing?

Yes, for a complete picture. This calculator focuses on annual operating cost, which is the recurring expense you pay every year. But the upfront investment matters too. A gas furnace costs $3,000-$7,000 installed. An air-source heat pump runs $8,000-$15,000, and a ground-source system $15,000-$30,000. To find the true break-even point, divide the extra installation cost by the annual savings. For example, if a heat pump costs $10,000 more than a gas furnace but saves $800/year, the payback period is about 12.5 years. Federal and state incentives can cut the payback by 3-5 years.

Does this calculator account for fixed charges and maintenance?

No. The calculator compares fuel and electricity costs only. It does not include gas service standing charges (typically $8-$25/month), electric meter fees, annual boiler servicing ($100-$200/year), heat pump maintenance ($100-$300/year) or equipment depreciation. These costs can add 10-20% to the totals shown. Gas systems also require chimney inspection and carbon monoxide detector maintenance. Heat pumps need periodic refrigerant checks and filter cleaning. For a full financial comparison, add these fixed and maintenance costs to the calculator results.

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