Quick answer
Oil heat is the strongest conversion case in Washington. Deliveries price above pipeline fuels, the buried tank is a liability that only ages, and no 2026 program pays a dollar toward oil equipment — while Seattle's Clean Heat Program takes $2,000 off a qualified oil-to-heat-pump conversion (up to $6,000 with the moderate-income bonus, through September 30, 2026) on top of utility rebates. Unless the furnace is nearly new, convert.
- Seattle's Clean Heat Program pays $2,000 point-of-sale on qualified oil-to-heat-pump conversions — up to $6,000 with the moderate-income bonus — with current funding through September 30, 2026.
- Income-eligible households can stack WA HEAR (up to $8,000 point-of-sale), and income-qualified Seattle homes may qualify for a no-cost conversion through the Office of Housing.
- A cold-climate heat pump runs $12,000–$20,000 installed on our published range — and it's the only option here that also cools.
- Oil is delivered fuel: prices swing with each truckload (tracked publicly by the U.S. EIA), and you're managing tank levels all winter.
- The tank matters as much as the furnace: Washington's PLIA runs heating-oil tank insurance and a loan & grant program for leaky tanks — decommissioning belongs in the conversion plan.
At a glance
| Oil furnace | Heat pump | |
|---|---|---|
| Fuel | Delivered heating oil — truckloads, tank levels, price swings | Electricity — no deliveries, no tank |
| Efficiency | ~80–90% AFUE burning a high-cost fuel | 2–4 units of heat per unit of electricity |
| Cooling | None | Built in — the same system reverses in summer |
| 2026 incentives | None — no program funds oil equipment | Seattle Clean Heat $2,000–$6,000 + WA HEAR + utility rebates |
| The tank | Aging buried liability — leaks become cleanup projects | Decommissioned as part of the conversion |
| Air quality | Combustion, flue, and oil odor indoors | No combustion, no flue, no CO pathway |
Clean Heat terms verified against the City of Seattle program page, July 2026; heating-oil price behavior per the U.S. EIA's weekly heating oil survey. Program funds are first-come, first-served.
What does each option cost installed in the Seattle area?
Conversion pricing has two halves: the heat pump system itself, and retiring the oil infrastructure properly. The incentive stack exists precisely for this scenario — oil-heated homes are the highest-priority conversion in every Washington program that pays one.
| Option | Typical installed range | What that covers |
|---|---|---|
| Cold-climate heat pump system | $12,000–$20,000 | Ducted system on your existing ducts (oil furnaces are ducted, so the delivery system usually stays) — before Clean Heat, HEAR, and utility money comes off. |
| Like-for-like oil furnace replacement | Quoted per system | Possible, but it re-commits the home to delivered fuel and an aging tank with zero incentive support — we'll price it honestly if you ask. |
| Oil tank decommissioning | Scoped per tank | Depends on tank location (buried vs basement), condition, and jurisdiction requirements. PLIA's programs exist for tanks that have leaked — we scope this into every conversion. |
What changes the price
- Incentive stack: Seattle Clean Heat ($2,000 base, up to $6,000 moderate-income, through 9/30/2026) + WA HEAR (income-eligible, up to $8,000) + Seattle City Light heat-pump discounts — eligibility is address- and income-specific.
- Duct condition: oil furnaces are ducted, so the heat pump usually reuses your ducts — but 50-year-old duct runs get evaluated before we promise that.
- Electrical capacity: the heat pump wants panel headroom; on income-eligible HEAR projects, up to $4,000 can go toward panel work.
- Tank type and location: an intact basement tank decommissions simply; a buried tank with any leak history becomes an environmental scope — PLIA insurance and grants exist for exactly that.
- Timing: Clean Heat funding is committed through September 30, 2026, first-come, first-served — waiting has a real price.
Ranges are representative Seattle / Puget Sound installed prices, not a quote — your home's specifics set the real number. Eco gives you an upfront price before any work begins.
How do they work differently?
How oil heat works today
A truck fills your tank a few times each winter. The furnace pumps oil through a burner nozzle, fires it in a heat exchanger, and a blower pushes hot air through your ducts — with combustion byproducts venting up the flue. It heats capably, but every BTU is bought by the truckload at delivered-fuel prices the EIA tracks weekly for a reason: they move. And the tank sits there, aging, whether you think about it or not.
How the conversion works
The heat pump takes over your existing ducts: outdoor unit, indoor air handler where the oil furnace stood, and electric strips as automatic backup for arctic snaps. Heat arrives by refrigerant instead of flame — 2 to 4 units of warmth per unit of electricity — and the same system cools in summer. The oil tank gets decommissioned to code as part of the project, closing the chapter properly.
Pros and cons, honestly
Oil furnace
Pros
- Heats capably in any weather — no balance-point conversation
- Reuses everything you have today, minimal project scope
- Familiar service model in neighborhoods that grew up on oil
- No panel work required
Cons
- Delivered fuel with truckload price swings and tank management
- The tank is an aging liability — buried leaks become cleanup projects
- Zero incentive support in 2026, and no cooling
- Combustion, flue maintenance, and oil odor indoors
Heat pump conversion
Pros
- The richest incentive case in Washington: Clean Heat + HEAR + utility rebates stack
- 2–4× the heat per unit of energy purchased, plus summer cooling
- No deliveries, no tank, no combustion, no flue
- Usually reuses the oil furnace's existing ductwork
Cons
- $12,000–$20,000 before incentives — real money upfront
- Panel capacity must be confirmed (and sometimes upgraded)
- Tank decommissioning adds scope to the project
- Comfort character changes from hot blasts to steady warm air
Which one should you choose?
Keep the oil furnace when
It's genuinely young — installed in the last handful of years — and running well, or the home is changing hands soon and the conversion decision belongs to the next owner. That's the honest end of the list. If you're replacing a dead oil furnace with a new oil furnace in 2026, you're buying decades more of delivered-fuel economics and tank liability that every incentive program in the state is paying people to leave.
Convert to a heat pump when
The furnace is past its prime, bills sting, the tank's age worries you, or cooling has joined the wish list — which covers most oil-heated homes we visit. In Seattle, Clean Heat's $2,000–$6,000 comes straight off the invoice through September 30, 2026, income-eligible households stack HEAR's up-to-$8,000 on top, and Seattle City Light discounts qualifying equipment. Few home upgrades anywhere have a stronger sponsored case.
Also consider: the tank, either way
Even if you keep oil heat for now, have the tank assessed. Washington's Pollution Liability Insurance Agency (PLIA) offers heating-oil tank insurance at no cost to registered owners and runs a loan & grant program for contaminated sites — protection that only works if you enroll before a leak is found. A buried tank's cleanup can dwarf the cost of any heating decision on this page.
The verdict, by situation
Heat pump conversion
The most-sponsored upgrade in the state
Clean Heat, HEAR, and utility rebates all target exactly this project. Better economics per BTU, summer cooling, and the tank liability retired properly.
Oil furnace
Defensible only when it's young
A healthy, recent oil furnace can serve out its years — but replacing oil with oil in 2026 means paying full price for the fuel, the tank risk, and the missed incentives.
Which Washington homes this fits
1950s Seattle rambler still on the original oil setup
The textbook Clean Heat conversion: ducts stay, tank retires, $2,000–$6,000 comes off at the point of sale, and SCL discounts the equipment.
Income-eligible Seattle household on oil heat
Ask about the no-cost conversion path through the Seattle Office of Housing before writing any check — it exists for exactly this home.
Oil-heated home outside Seattle, Shoreline or Edmonds
Clean Heat is Seattle-only, but WA HEAR (income-eligible) and your utility's heat-pump rebate still stack — and the tank math is identical everywhere.
Home with a buried tank of unknown history
Assess the tank first and check PLIA coverage before it becomes a surprise — then fold decommissioning into the conversion scope.
Ready to compare for your home?
Get honest numbers for both options side by side — an upfront range, the considerations, and the rebates you qualify for, before any work begins.
Continue exploring
- BookHeat pump installation
- BookHeating services
- BookElectrical panel upgrades
- CompareDual Fuel vs All-Electric Heat Pump: Is the Gas Backup Worth It?
- CompareGas vs Electric Furnace: Which Should a Puget Sound Home Install?
- CompareHeat Pump vs Electric Furnace: The All-Electric Showdown
- CompareWhole-Home Electrification vs Natural Gas: The Strategic Decision
- GuideSeattle City Light rebates guide (2026)
- GuideWashington rebates & incentives
- GuideHVAC system cost guide
- CompareAll heating & air comparisons
Common questions
How much does Seattle's Clean Heat Program actually pay?
$2,000 off the invoice when an oil-heated Seattle home converts to a qualified heat pump, and moderate-income households can stack a bonus that brings the total to $6,000. Income-eligible households may qualify for a no-cost conversion through the Seattle Office of Housing. Current funding runs through September 30, 2026, first-come, first-served — verified against the City's program page in July 2026.
Can the heat pump use my oil furnace's ducts?
Usually, yes — oil furnaces are ducted systems, so the delivery infrastructure typically stays. We evaluate the duct runs for leakage and sizing as part of the quote, because a 50-year-old duct tree sometimes needs sealing to let the new equipment perform. That evaluation is standard on every conversion, not an upsell.
What happens to my oil tank?
It gets decommissioned to your jurisdiction's requirements — typically pumped, cleaned, and either removed or filled in place, with documentation you'll want at resale. If the tank has leaked, Washington's PLIA runs insurance and a loan & grant program for heating-oil tank cleanup. Either way, the tank plan belongs inside the conversion project, not discovered after it.
Is oil heat really more expensive than a heat pump?
Per unit of delivered heat, oil is one of the most expensive ways to keep a Puget Sound home warm — you're burning a trucked-in fuel (whose prices the EIA tracks weekly because they move) at roughly 80–90% efficiency, while a heat pump delivers 2–4 units of heat per unit of electricity. Your exact numbers depend on your tank contract and usage, and we'll walk them honestly at the estimate.
I'm outside Seattle — does any of this apply?
Clean Heat is Seattle-specific, but the rest of the stack travels: WA HEAR's point-of-sale rebates (income-eligible, up to $8,000) work statewide through participating contractors, and PSE, SnoPUD, and Tacoma Power each pay on qualifying heat pumps — Tacoma's income-qualified HEAR program can even cover up to 100% of a conversion from oil. The tank realities are the same at every address.
Last updated: 2026-07-17
Sources & references
Equipment ratings, program details, and industry figures on this page come from manufacturers and primary sources, linked below. Verify program status and requirements for your home where applicable.
Programs & incentives
- Seattle Clean Heat pays $2,000 (up to $6,000 moderate-income) on qualified oil-to-heat-pump conversions, with funding through September 30, 2026 — City of Seattle — Clean Heat Program
- WA HEAR point-of-sale rebates for income-eligible heat pump projects — WA Commerce — HEAR program
- Seattle City Light instant heat-pump discounts through participating contractors — Seattle City Light — Home Energy Solutions
Fuel & tank realities
- Residential heating oil prices are surveyed and published weekly each heating season — U.S. EIA — Heating Oil & Propane Update
- Washington's PLIA offers heating-oil tank insurance and a loan & grant program for tank cleanup — WA Pollution Liability Insurance Agency