Heat Pump Savings Calculator

A furnace burns fuel and can only turn a fraction of it into heat — an 80% AFUE unit wastes a fifth up the flue. A heat pump doesn’t make heat, it moves it, so each unit of electricity delivers two to four units of heat (a seasonal COP of 2–4). Whether that lowers your bill depends on the price gap between your fuel and electricity: where electricity is moderately priced and gas is dear, the savings are large; where power is very expensive and gas is cheap, savings shrink. This calculator prices both sides using your actual rates and efficiencies so you see the real result, not a rule of thumb.

HSPF2 measures seasonal heating output per watt-hour, and SEER2 measures seasonal cooling efficiency. They replaced the older HSPF and SEER ratings under updated federal test procedures that use higher external static pressure, so the numbers run a little lower than the old scale for the same equipment — an HSPF2 of 8.5 is roughly a legacy HSPF of about 9. Enter the HSPF2 and SEER2 printed on the new unit’s spec sheet. Standard heat pumps rate around HSPF2 7.5–8.5, while cold-climate models reach 9–11; SEER2 typically runs 15–18.

A heat pump loses capacity as it gets colder outside. The balance point is the outdoor temperature where its output no longer covers your home’s heat loss; below it, electric strip heaters — the backup resistance — make up the difference at a COP of about 1, which is far pricier than the heat pump itself. The backup share is the portion of your heating season met that way. In mild climates it’s near zero; a standard unit in a cold climate might run 15–30%. Because strip heat is costly, this share has an outsized effect on your bill, which is why the calculator models it explicitly.

The calculator takes your installed cost, subtracts any avoided replacement and rebates to get a net project cost, then divides that net by your year-one annual saving to find the payback period — the point where saved energy has repaid the upgrade. From there it projects both paths over the unit’s lifespan, raising fuel and electricity by the escalation rates you set, and reports the lifetime cost of keeping your current system versus switching. The difference is your net lifetime saving, and the year-by-year schedule flags the exact year the heat pump comes out ahead.

Yes. Modern cold-climate heat pumps are designed to hold useful capacity well below freezing and are used successfully across the coldest U.S. zones. The trade-off is that a standard unit leans harder on backup resistance heat as temperatures fall, which raises running cost — so in DOE Zones 5 through 7 a higher-HSPF2 cold-climate model and a proper Manual J sizing matter more. Set a realistic backup share for your climate in the calculator and it will show how much that strip heat adds, giving you an honest picture rather than a best-case one.

Incentives change, so confirm what’s current before you rely on any figure. The federal Section 25C tax credit that offered up to $2,000 toward a qualifying heat pump expired for systems placed in service after December 31, 2025, so heat pumps installed in 2026 no longer qualify for it. Other pathways can still cut the cost, including income-qualified federal rebate programs (HEAR/HEEHRA) and a wide range of state and utility rebates, which often stack. Check your state energy office and your utility for current programs, then enter the total you expect in the rebates field so the payback reflects your real out-of-pocket cost.