hvac
Furnace Replacement Cost in Washington: Gas, Electric, and Heat Pump Prices by Region
Furnace replacement in Washington runs about $4,000 to $8,500 for gas and up to $20,000 for heat pumps. Compare costs by region, code changes, and rebates.
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Furnace Replacement Cost in Washington: Gas, Electric, and Heat Pump Prices by Region
Replacing a gas furnace in Washington typically costs about $4,000 to $8,500 installed, while moving to a ducted heat pump usually runs about $9,000 to $20,000. The Cascades split those numbers in two. A Seattle home that rarely sees a hard freeze needs something different from a Spokane home that sits through weeks of cold, so the right replacement depends on which side of the mountains you live on.
State policy has also been in the news. In September 2026, the Washington Supreme Court struck down Initiative 2066, the voter-approved natural gas measure, and the fight left many homeowners wondering whether gas furnaces are still allowed. The short answer is below, along with prices by fuel, by region, and by utility.
Prices at a Glance
These are approximate installed ranges for a typical single-family house with existing ductwork. Puget Sound labor sits at the higher end of each range, and Spokane, Yakima, and Tri-Cities jobs often come in lower.
| Replacement option | Roughly what it costs installed |
|---|---|
| Electric furnace, like for like | $3,000 to $6,000 |
| Standard gas furnace, 80 percent efficiency | $4,000 to $6,500 |
| High-efficiency gas furnace, 95 percent | $5,000 to $8,500 |
| Ducted heat pump and air handler | $9,000 to $18,000 |
| Cold-climate ducted heat pump | $11,000 to $20,000 |
| Heat pump paired with a gas furnace | $10,000 to $18,000 |
| Oil furnace to heat pump conversion | $11,000 to $22,000 plus tank work |
Extra costs often come from outside the furnace itself. Ductwork repairs can add $1,000 to $5,000, venting changes on an old 80 percent furnace can add several hundred, and panel work for a heat pump can add $2,000 to $5,000. Ask each contractor to list those lines separately so you can compare the same scope.
West of the Cascades: Mild, Damp, and Good for Heat Pumps
Seattle and Tacoma winters are long and gray, with temperatures that tend to sit in the 30s and 40s and few nights near single digits. A heat pump works efficiently in those conditions, and many homes here can rely on one for nearly all of their heating. Air conditioning comes along with it, which has become a bigger selling point after recent summer heat waves.
Electric rates are another reason the math can work out. Seattle City Light and Tacoma Public Utilities have long offered some of the lower residential electric rates in the country, while Puget Sound Energy supplies gas in much of the region. Run the comparison with your own bill, because rates shift and your insulation level matters as much as your fuel.
Older homes west of the mountains are a special case. Oil furnaces still heat a noticeable share of older houses around Seattle and Tacoma, often with a tank in the basement or buried in the yard. Those conversions take more planning, and a tank decommissioning can add anywhere from around $1,000 to well above that if the tank has leaked.
East of the Cascades: Colder Nights Change the Equipment
Spokane and the surrounding Inland Northwest see much colder stretches, with winter lows that can fall below zero in a hard snap. Yakima has a drier climate with cold winters and hot summers. A standard heat pump loses capacity as temperatures drop, so an installer here will either specify a cold-climate model or pair it with a backup.
Gas keeps a strong following on this side of the state. A high-efficiency furnace remains a common and sensible choice for many Spokane and Yakima homes, particularly where gas already serves the house. A dual-fuel setup splits the difference by running the heat pump in mild weather and letting the furnace take over during the coldest days.
Rural homes east of the mountains may not have natural gas at all. Propane furnaces cost about the same to install as gas models, but fuel costs usually run higher per unit of heat. In those homes, a cold-climate heat pump with an existing propane furnace as backup can trim fuel use without giving up the security of a flame on the coldest night.
Summer heat also matters more in Yakima and Spokane than many people expect. Pricing the cooling side at the same time can save you money compared with buying a furnace now and an air conditioner two years later. That's a reason to get a quote for both systems before you sign for a single furnace.
Where Washington's Energy Code Is Headed
Washington's residential energy code has favored heat pumps for several years, mainly through a credit system that rewards lower energy use in new construction. The 2021 code took effect on March 15, 2024, after revisions removed an earlier heat pump requirement. The next code cycle, the 2024 codes, was delayed, and the State Building Code Council has listed May 3, 2027 as its effective date.
Initiative 2066 tried to block state and local rules that discouraged gas use. The Washington Supreme Court ruled it unconstitutional on September 17, 2026, in a 6 to 3 decision, finding that the measure covered more than one subject. The Building Industry Association of Washington, which backed the measure, said it had no plans to appeal, so expect code discussions to continue without the initiative in place.
For a homeowner replacing a furnace, the practical takeaway is narrower than the headlines. We found no statewide rule that bars replacing a gas furnace in an existing home, and the code debate has centered mostly on new construction. Local rules can differ, so ask your contractor and your building department before you commit to any fuel.
Long-term gas pricing is a fair thing to factor in. Washington's cap-and-invest program adds to the cost of natural gas, and policymakers continue to push toward lower carbon use. A furnace bought today could run for 15 to 20 years, so a dual-fuel setup or a heat pump can be a reasonable hedge if the numbers are close.
Rebates, Utility by Utility
Washington has no single rebate that applies across the state, so your utility and your income drive what's available. The federal 25C credit won't help, since it ended for equipment placed in service after December 31, 2025. Any contractor who still pitches it for a current installation is out of date.
Several programs are worth checking before you sign:
- Puget Sound Energy has listed a $250 rebate for a qualifying 95 percent or better gas furnace, and that rebate does not combine with a heat pump installation. Income-qualified customers may be able to get higher amounts through its Efficiency Boost program.
- Seattle City Light has offered a $2,000 instant rebate for converting oil heat to a qualified heat pump through a participating contractor, and the city has a separate no-cost conversion program for income-eligible households.
- Washington's HEAR program, run by the Department of Commerce, works through local administrators for households at or below 150 percent of area median income. Availability differs by area, and some areas may not have an administrator in place.
- Avista serves Spokane, and Pacific Power and Cascade Natural Gas serve Yakima, so check those utilities' current offers directly since we couldn't confirm current amounts.
Rebate rules often require approval before installation, and funding can change during the year. Get the current terms from the program itself and keep a copy with your quote.
Permits and Contractor Checks
HVAC contractors in Washington register with the Department of Labor & Industries, and you can look up their registration, bond, and insurance on its website. Electrical connections need the right credential too, and many HVAC installers hold a specialty electrical certificate for that purpose. A furnace replacement generally calls for a local mechanical permit, plus an electrical permit if wiring work is involved.
Ask who pulls the permits and whether inspection is part of the price. An unpermitted furnace can create problems at resale, along with insurance questions if something goes wrong. Comparing a few HVAC companies listed in our directory with the same scope of work gives you the cleanest quote comparison, and our other Washington home cost guides can help with related projects.
Washington Furnace Replacement Questions
How long does it take to replace a furnace?
A like-for-like swap usually takes a day, and many Puget Sound crews can finish in about 6 to 10 hours. Fuel changes and conversions from oil often take 2 or 3 days once you include tank work and electrical upgrades.
Should a Tacoma house with a working gas furnace switch to a heat pump now?
There's no need to rush if the furnace is under 10 years old and running well. Start planning at around 15 years, since picking equipment during a January breakdown limits your options and usually raises the price.
Is a heat pump enough on its own in Spokane?
It can be if you choose a cold-climate model sized for the region's lows, and many have electric or gas backup for the coldest nights. Ask the installer to show you capacity at about 5 degrees, since that figure tells you more than the nameplate rating.