Heat Pump vs Gas Furnace: The 15-Year Total Cost Reveals a Clear Winner
At $1.50/therm gas and $0.14/kWh electricity, heat pumps typically win by year 8. At higher gas prices — which EIA forecasts through 2030 — the crossover comes sooner.
Photo by Erik Mclean / Unsplash
Over 15 years, a heat pump consistently outperforms a gas furnace on total cost in most US climates — once equipment cost, fuel cost, and maintenance are all included. The margin depends on your gas and electricity rates.
The math that decides it
A gas furnace at 96% AFUE converts 96 cents of every dollar of gas into heat. A heat pump at COP 3.0 produces 3 units of heat per unit of electricity. The break-even equation:
Heat pump wins if: electricity cost per BTU < gas cost per BTU
- Heat pump cost per BTU = electricity rate ÷ (COP × 3,412 BTU/kWh)
- Gas furnace cost per BTU = gas rate ÷ (100,000 BTU/therm × 0.96)
At $0.14/kWh electricity and $1.50/therm gas, heat pump cost = $0.000041/BTU vs gas = $0.000016/BTU. Gas wins at these rates.
At $0.14/kWh electricity and $2.50/therm gas (current national average), heat pump cost = $0.000041/BTU vs gas = $0.000026/BTU. Still close.
The heat pump advantage shows clearly at higher electricity rates (California, New England) or higher gas prices — EIA projects gas prices rising faster than electricity rates through 2030.
Where heat pumps clearly win
- Electric resistance heating: Heat pumps at COP 3.0 produce the same heat for one-third the electricity cost.
- High-gas-cost regions: New England ($2.50–3.50/therm), California ($2.00+/therm)
- With IRA credits stacked: The Section 25C $2,000 credit reduces heat pump payback by 1–2 years in most scenarios.
15-year cumulative cost example
For a 2,000 sq ft moderate-climate home at $0.14/kWh and $1.75/therm with 3% annual gas inflation:
- Gas furnace ($3,500 installed): ~$41,000 total 15-year cost
- Heat pump ($7,000 installed, $2,000 ITC): ~$36,000 total 15-year cost
- Heat pump saves $5,000 over 15 years
Run your own numbers with the Heat Pump vs Gas Furnace Calculator.
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