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Free air source heat pump savings calculator. Model annual heating cost for a new ASHP versus a gas furnace, electric resistance, or older heat pump using annual heat demand, COP, and utility rates. Explore more in our energy and sustainability calculator category.
Last updated: April 18, 2026
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Useful heat into the home per year; energy models or audits often provide this.
Baseline
$262
227.5 therms/yr
New ASHP
$300
1,875 kWh/yr
Extra annual cost vs baseline
$38
≈ 14.7% vs baseline heating cost.
Planning note
ASHP COP
Higher value
Cold-climate rated units can justify higher seasonal COP assumptions in northern heating loads.
$/therm
Sensitivity
When gas is expensive, electrification with a strong COP often improves modeled savings.
COP 1
Large gap
Switching from baseboard or furnace resistance to a heat pump typically shows large operating savings.
Older COP
Realistic delta
Replacing a 1990s heat pump may yield smaller savings than replacing gas—depends on rates and COPs.
AFUE
Tighter comparison
A 95–98% furnace raises the bar for heat pump operating savings versus an 80% unit.
Install
Separate tool
Pair annual savings with quotes and rebates to estimate simple payback on the project.
Default gas-furnace baseline: modeled annual savings about -$38 ( positive means lower heating operating cost for the ASHP under these inputs).
The new air-source heat pump divides annual useful heat demand by COP to get compressor and fan electricity in kilowatt-hours, then multiplies by your electricity rate. Baseline cost uses the same heat demand: for electric resistance it equals demand times electricity rate; for an older heat pump it divides demand by baseline COP and applies the electricity rate; for a gas furnace it divides demand by AFUE, converts to therms with a standard kilowatt-hours-per-therm factor, and multiplies by gas price per therm. Annual savings subtract heat pump cost from baseline cost.
ASHP kWh ≈ heat demand ÷ ASHP COPGas therms ≈ (heat demand ÷ AFUE) ÷ 29.3 kWh/thermSavings ≈ baseline $ − ASHP $Switch baseline to resistance or older heat pump to explore other retrofit paths.
Share it with anyone comparing heat pump upgrades
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