Ducted Heat Pumps and Oil Furnace Replacement in Burien, WA

Heat pump installation in Burien often means replacing an oil furnace, and doing it without the Seattle rebate that neighbors a few miles north can use. The Seattle Heat Pump Company plans and manages ducted heat pump projects in Seahurst, Gregory Heights, Shorewood, Three Tree Point, Boulevard Park and around Lake Burien, with the work carried out by licensed and insured contractors.

The decision in front of most Burien owners is how to fund and sequence an oil-to-heat-pump conversion when the program that pays for many Seattle conversions does not reach them, and how to protect an outdoor unit that sits within reach of Puget Sound air.

Burien has the highest oil-heat share in the county data

Census estimates show about 9.0% of Burien households heating with oil, roughly 1,763 homes. That is the highest share among the King County cities in the Census comparison behind this page, ahead of Lake Forest Park at 6.5% and Shoreline at 4.1%, and well above Seattle’s citywide 2.9%. About 34.8% of Burien households heat with utility gas.

The housing explains part of it. About 36% of Burien’s homes were built in the 1950s and 1960s, and nearly half date from the 1940s through the 1960s. Only 8% predate 1940. Many houses from those decades were built with a central furnace and ducts, and where a house still has them, the duct system gives an oil to heat pump conversion a head start. Where a house was built with baseboard or wall heaters instead, the project looks different, so the first visit establishes which kind of house it is.

Funding a conversion without Seattle Clean Heat

Seattle Clean Heat’s $2,000 rebate and its moderate-income bonus apply only inside Seattle city limits. That changes the money, not the method. Three sources remain relevant in Burien:

• City Light’s contractor discount. Burien is in Seattle City Light territory, so qualifying equipment earns $300 or $600 by efficiency tier, one system per home, paid through participating distributors and contractors.
• PLIA’s Heating Oil Loan and Grant program. A statewide program from the Pollution Liability Insurance Agency, with up to $75,000 per project, no income limit, and pre-approval required before any tank work. PLIA takes applications in a limited window each year, usually in late fall, so check PLIA’s site for the current dates.
• PSE’s income-qualified gas rebate. For gas-heated houses only: $4,000 for income-qualified PSE gas customers who switch to a heat pump, installed by a PSE Trade Ally.

The state’s former heating oil insurance does not cover new claims; its policy expired June 30, 2025. That makes the PLIA timing worth deciding early, because decommissioning a tank before PLIA approves the project forfeits the funding.

The heat pump versus oil furnace guide compares the two systems on cost and upkeep. No official Washington series tracks heating oil prices, so the fairest comparison uses your own delivery receipts.

The tank is a separate permit path

Inside Seattle, the fire department issues tank decommissioning permits to ICC-certified decommissioners. Burien is outside that system, so Seattle’s permit does not apply here. The requirements of the local fire authority are confirmed for each Burien project before tank work is scheduled, and the work itself is done by a certified decommissioner. The oil tank decommissioning page explains the difference between removal and filling in place, which applies wherever the tank sits.

Salt air and the outdoor unit

Seahurst Park, Three Tree Point and the Shorewood shoreline face Puget Sound directly. Salt carried on wind settles on outdoor coils and fins, and over years it corrodes aluminum fins and the joints where coil tubes meet. No local data measures how fast that happens in Burien, and no manufacturer publishes a distance-from-shore cutoff for US units, so the precautions are a judgment call for each lot.

Manufacturer guidance gives the starting point. Carrier’s owner literature tells coastal owners to wash outdoor units about every three months. Mitsubishi Electric offers protective coil coatings and a seacoast protection package on some outdoor units. In practice that means specifying coated coils where a house sees sea spray, siting the unit on the side of the house away from the prevailing wind when the noise and line-set routes allow, and planning on rinsing. The heat pump maintenance guide covers what owners can do between service visits.

What the assessment covers

The load calculation follows ACCA Manual J, room by room, so the heat pump is sized to the house rather than to the old furnace’s nameplate. Seattle’s own 24°F design temperature comes from the Sea-Tac Airport station a few miles east, so Burien’s winter design conditions are close to Seattle’s.

The ducts get a static pressure test, because a heat pump needs more airflow than an oil furnace for the same heat; using a heat pump with existing ductwork explains what the readings show. The electrical panel gets checked for the heat pump circuit and any backup heat strips. Burien issues its own electrical and building permits, so fees and inspection steps differ from Seattle’s.

Running costs on City Light’s suburban rate

Burien pays City Light’s suburban rate of 14.64 cents per kWh, slightly above Seattle’s 13.38 cents. At that rate, a heat pump beats a 95% efficient gas furnace on energy cost once it averages a coefficient of performance of about 2.4. A modern variable-speed unit clears that bar through most Seattle-area winter weather, so for a gas-heated Burien house, a furnace to heat pump conversion usually still makes sense on running cost. The operating cost guide shows how the numbers move with your rate and your house.

Neighboring areas differ in useful ways. West Seattle to the north has its own shoreline exposure but sits inside Seattle Clean Heat territory. Renton to the east splits between City Light and PSE, and Rainier Valley and Seward Park covers southeast Seattle.