Heat Pump Savings Calculator in Washington
Compare heat pump and furnace heating costs in Washington. Uses local climate data (5000 HDD), electricity rates, and fuel prices for accurate savings estimates.
Data last updated July 2026. Sources & methodology
What Washington Residents Should Know
Washington falls in IECC climate zone 4-5B with 5,000 heating degree days per year — above the national average. Modern cold-climate heat pumps achieve an average COP of 2.6 in Washington's conditions, making them competitive with gas furnaces for most of the heating season.
With natural gas at $1.15 per therm in Washington, a gas furnace may have lower operating costs in the coldest months. However, heat pumps provide both heating and cooling in one system, which can offset the difference when you factor in AC savings. In shoulder seasons (spring and fall), a heat pump is significantly more efficient, often making the overall annual cost competitive with gas.
A heat pump also replaces your air conditioner, and Washington's 350 cooling degree days make that dual-function value real: one system handles both seasons, so you retire a separate AC unit and its maintenance along with the furnace. For homes with an aging furnace-and-AC pair, replacing both at once is usually where a heat pump makes the strongest financial case in Washington.
Washington does not currently offer dedicated state-level heat pump incentives, and the federal 25C credit ended December 31, 2025. The case for a heat pump now rests on operating savings and the dual heating-cooling functionality — which, in the right climate and at the right fuel prices, can still make it the better long-term investment. Some utilities also offer their own rebates, so check locally. Enter your home details above to see your projected savings.
Avg. Electricity Rate
$0.112/kWh
Avg. monthly bill: $108
Regular Gas Price
$3.80/gal
Natural gas: $1.15/therm
Heating Degree Days
5,000
Cooling: 350 CDD
Incentives in Washington
Federal clean energy tax credits ended in late 2025 under legislation passed in July 2025; they are shown below for reference since recent purchasers may still claim them. State programs are governed separately and many remain active — always verify current details with the program before purchasing.
| Incentive | Type | Amount | Description |
|---|---|---|---|
| Energy Efficient Home Improvement Credit (Heat Pump - 25C)Ended | tax credit | 30% | Federal tax credit of 30% up to $2,000 for qualifying heat pumps. Ended December 31, 2025 — systems placed in service after that date do not qualify. State and utility heat pump rebates remain available in many states. |
Heat Pump Savings in Washington: Frequently Asked Questions
- Are heat pumps worth it in Washington?
- In Washington, low natural-gas prices mean a heat pump may not beat a gas furnace on heating cost alone, but its combined heating-and-cooling in one system, plus efficiency in mild months, can still make it the better long-term choice.
- Do heat pumps work in Washington's climate?
- Washington sits in IECC climate zone 4-5B with about 5,000 heating degree days per year. Modern heat pumps there average a heating COP of 2.6, meaning they deliver 2.6 units of heat per unit of electricity.
- Are there heat pump rebates in Washington?
- Washington does not currently offer dedicated statewide heat pump rebates, and the federal 25C credit ended December 31, 2025. Many local utilities still offer their own rebates, so check with yours before buying.
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Use our free calculator pre-filled with Washington data to see your personalized results.
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