# How Much Does Heat Pump Installation Cost in Seattle?

> Heat pump installation cost in Seattle: ducted systems typically run $6,700 to $20,000. See what moves the price, permit fees, rebates and running costs.

URL: https://seattleheatpumpco.com/guide/heat-pump-installation-cost-seattle/

Updated: 2026-10-21

*Seattle-area price ranges for ducted heat pumps, the handful of factors that move a quote by thousands of dollars, and what City Light, Seattle and PSE take off the top.*

Heat pump installation in Seattle typically costs about $6,700 to $20,000 for a ducted system on existing ducts that are in usable shape, based on published cost data. Duct rework, an electrical panel upgrade, an oil tank or a new air handler can push a project above that range, while City Light, Seattle Clean Heat and PSE incentives bring the net price down.

**Key takeaways**

- Ducted heat pump on usable ducts: about $6,700 to $20,000 in the Seattle area.
- Seattle permits for a typical job: about $192 to $556 under SDCI's current fee schedule.
- City Light discounts: $300 or $600 by efficiency tier. Oil conversions: $2,000 Seattle Clean Heat rebate on qualifying equipment.
- The federal 25C tax credit ended for equipment placed in service after December 31, 2025.

These are budgeting ranges, not quotes. [The Seattle Heat Pump Company](https://seattleheatpumpco.com/) publishes them so you can tell whether an estimate is in the normal range before you sign, and so you can see which parts of a quote are doing the heavy lifting.

## Seattle heat pump costs at a glance

The table below collects the ranges that matter for a typical ducted project. Each one assumes a single-family house and normal access.

| Job or add-on | Typical range | What the range covers |
|---|---|---|
| Ducted heat pump installation | $6,700–$20,000 | Outdoor unit, matched indoor coil or air handler, line set, pad, drain, thermostat, on usable ducts |
| Like-for-like heat pump replacement | $6,700–$15,000 | Swapping an existing ducted heat pump, reusing ducts and, where it tests sound, the line set |
| Electrical panel upgrade, 100 to 200 amps | $1,333–$4,500 | New panel and service capacity, before utility-side work |
| Air handler replacement | $1,500–$4,200 | Indoor fan and coil cabinet, national figures |
| Oil tank fill in place (clean site) | $700–$3,000 | Pump-out, cleaning, inert fill, plus the $184 Seattle Fire Department permit |
| Smart thermostat, installed | $200–$500 | Heat pump compatible thermostat, national figures |
| Seattle permits for a typical job | $192–$556 | Refrigeration and electrical permits, plus a mechanical permit where indoor equipment changes |

Where those figures come from matters, because published cost data disagrees. National cost guides put a central ducted air-source heat pump at roughly $5,000 to $15,000 (Fixr) or $4,000 to $12,000 on existing ducts (HomeGuide). The Bonneville Power Administration's regional estimate for high-performance ducted retrofits and conversions in the Northwest averages about $17,000, a single figure rather than a range. Seattle-area survey data starts lower, around $6,700. The range on this page spans that evidence instead of averaging it, so it shows the real uncertainty rather than hiding it.

## What actually moves the price

Two houses on the same block can get quotes $8,000 apart for reasons that have nothing to do with the contractor's margin. These are the drivers that do most of the work, in rough order of impact.

### Equipment size and efficiency tier

Capacity follows the load calculation, not the square footage alone. Seattle's energy code requires a Manual J load and Manual S selection, and the equipment must not be larger than the smallest size that meets the load. A well-insulated 1,800 square foot house might need two tons; a drafty one of the same size might need three and a half.

Efficiency tier is the bigger lever on price. Variable-speed equipment with higher SEER2 and HSPF2 ratings costs more, runs more quietly at low speed, and handles Seattle's long shoulder seasons with less cycling. City Light's contractor discount is tied to those ratings:

| City Light tier | Minimum SEER2 | Minimum HSPF2 | Discount |
|---|---|---|---|
| Tier 1 | 15.2 | 8.1 | $300 (retrofits only) |
| Tier 3 | 16.0 | 9.5 | $600 |

The discount is paid through participating distributors and contractors, and City Light strongly recommends it be passed to the customer, so ask that it appear on the invoice.

### The indoor side: coil on the furnace or a new air handler

If your gas furnace is fairly new and its blower has capacity to spare, the heat pump's indoor coil can sit on top of it. That is the dual fuel setup, and it is usually the cheaper indoor option. If the furnace is old, burns oil, or you want to drop gas entirely, an electric air handler replaces it. Air handler replacement alone runs about $1,500 to $3,400 (HomeGuide) to $4,200 (Carrier) in national figures, and electric backup heat strips inside it add electrical load.

### Ducts

This is where Seattle's older housing earns its reputation. A heat pump moves more air than a gas furnace to deliver the same heat, so ducts sized for a furnace can come up short, especially on the return side. The fixes range from sealing joints in the crawlspace, to adding a return, to replacing the system. Whole-house duct replacement runs about $1,400 to $5,600 in HomeGuide's national figures, while Fixr's range runs from about $1,900 to about $17,100 for complex installs. A static pressure test during the assessment tells you which end of that scale you are on, which is why it should happen before equipment is priced.

### Electrical work

Every heat pump needs a dedicated circuit and an outdoor disconnect. Many Seattle houses can take that on the existing panel. Whether a service upgrade is needed depends on the panel size, what else runs on it, and whether electric backup heat is in the design. When an upgrade from 100 to 200 amps is needed, it typically runs about $1,333 to $4,500 in the Seattle area, with national guides putting it at $1,800 to $4,500 (Fixr). City Light's own service-side charges, when the utility connection changes, are not published, so ask about them for an older service.

### Line set, location and access

A short line run from a basement air handler to a rear-yard pad is the easy case. Long runs, attic air handlers, second-floor routes, roof mounts and tight side yards add labor and material. In Seattle, a side-yard location also triggers a noise review, and a design that needs a sound barrier or a compressor blanket to stay under the limit carries that cost too.

### Refrigerant rules

Since January 1, 2026, Washington requires new residential heat pumps to use refrigerants with a global warming potential under 750, which excludes R-410A. For a replacement, that can mean a new indoor coil to match the outdoor unit and closer scrutiny of an old line set. It rarely changes a new installation's price on its own, but it explains why a "swap the outdoor unit only" quote is less common than it used to be.

## Seattle permit fees

Permit fees are a small part of the total, but they are fixed by the city, so they make a useful check on any quote. The Seattle Department of Construction and Inspections' current fee schedule sets these amounts, each including the 5% technology fee:

| Seattle permit | Current fee | When it applies |
|---|---|---|
| Refrigeration permit | $81.95 | Any split-system heat pump; only a licensed refrigeration contractor can obtain it |
| Electrical permit, circuit only | $110.38 | New heat pump circuit and disconnect |
| Electrical permit with 200 amp service | $410.84 | Circuit plus a service upgrade |
| Mechanical permit, heat pump | $63.37 per unit | When indoor equipment is installed or altered |
| Fire Department permit 6103 | $184 per tank | Oil tank decommissioning |

That puts a typical job at about $192 for the refrigeration and electrical permits alone, up to about $556 when the indoor equipment changes and the service is upgraded. Suburbs run their own permit offices. Bellevue requires a mechanical permit for a heat pump, and Shoreline and Lake Forest Park electrical permits go through Washington Labor & Industries rather than the city.

## Incentives that lower the net price

Incentives change often, so every amount here carries its check date. Confirm the current terms before you sign, because some programs require a participating contractor or pre-approval.

| Program | Amount | Who it applies to |
|---|---|---|
| Seattle City Light contractor discount | $300 or $600 | City Light customers, qualifying equipment, one system per home |
| Seattle Clean Heat base rebate | $2,000 | Oil-heated Seattle homes, qualifying Mitsubishi Electric heat pump, participating contractor |
| Seattle Clean Heat moderate-income bonus | $4,000 more | 81% to 150% of area median income, installs completed within the program's current funding period |
| Seattle Office of Housing HomeWise | Free conversion | Income-eligible Seattle households heating with oil |
| PSE hybrid heat pump rebate | $1,500 ($2,400 income-qualified) | PSE gas and electric customers adding a heat pump to a gas furnace |
| PSE electric resistance to heat pump | $1,500 ($2,400 income-qualified) | PSE electric customers replacing baseboard or other resistance heat |
| PSE income-qualified gas to heat pump | $4,000 | Income-qualified PSE gas customers who remove or cap gas heat |
| Federal 25C tax credit | Ended | Not available for equipment placed in service after December 31, 2025 |

A few things trip people up. PSE's hybrid rebate requires both PSE gas and PSE electric service, so it does not apply inside Seattle, where City Light sells the electricity. Since April 2, 2026, PSE rebates require a PSE Trade Ally installer. And the federal IRA home energy rebate programs had not launched in Washington; the state-funded money reaches Seattle homeowners through the Clean Heat bonus instead. The [Seattle rebate guide](https://seattleheatpumpco.com/guide/heat-pump-rebates-seattle/) keeps the details current.

## Three example budgets

These examples are illustrative. They combine the published ranges above to show how a project adds up; they are not quotes for any real house.

| Example | Main work | Add-ons | Incentives | Budget picture |
|---|---|---|---|---|
| Gas furnace with old AC, City Light customer, ducts test fine | Heat pump coil on the existing furnace, new outdoor unit | Thermostat | City Light $300 or $600 | Within the $6,700–$20,000 installation range, likely the lower half |
| Oil furnace at end of life, Seattle, tank in the yard | Air handler replaces the oil furnace, new outdoor unit | Tank fill in place $700–$3,000 plus $184 permit; possible panel upgrade | Clean Heat $2,000 on qualifying equipment, plus $4,000 for eligible incomes | Installation range plus the tank, minus rebates |
| Eastside rambler, PSE gas and electric, undersized return | Heat pump on the existing furnace (dual fuel) | Added return and duct sealing | PSE hybrid rebate $1,500 | Installation range plus duct work, minus the rebate |

## What it costs to run

Installation price is half the story. Inside Seattle, City Light's current residential rate is 13.38 cents per kWh, and PSE sells gas at about $1.67 per therm. At those rates, a heat pump costs less to run than a 95% efficient gas furnace whenever its coefficient of performance is above about 2.2, which a modern unit clears through most Seattle winter weather. On PSE electricity at about 20.6 cents per kWh, the break-even rises to about 3.4, which is why dual fuel makes more sense on the Eastside.

For oil-heated homes, there is no official local heating oil price series for Washington, so a precise comparison is not possible from public data. What is clear is that oil heat carries the tank as a liability, and Seattle aims to transition all oil-heated homes by 2030. The [operating cost guide](https://seattleheatpumpco.com/guide/heat-pump-operating-cost-seattle/) works through the math for each fuel.

Bills depend on more than the rate. An undersized system or a badly set thermostat that leans on electric backup heat can erase the savings, which is one more reason the load calculation and commissioning matter.

## How to read a heat pump quote

A quote that only lists a brand and a price is hard to judge. Ask for these, and compare quotes on the same terms:

- the load calculation result for heating and cooling, and the design temperature used
- outdoor and indoor model numbers, with the AHRI matched-system rating
- whether ducts were tested, and what duct work is included
- electrical scope: new circuit only, or a panel or service upgrade
- line set: new or reused, and if reused, how it will be tested
- permits included, and who pulls the refrigeration permit
- which rebates the contractor will apply on the invoice
- what commissioning includes: airflow, charge, defrost and backup heat lockout

A quote far below the range often leaves out ducts, electrical work or permits. One far above it may include work you need, or a tier you don't. The [quote comparison guide](https://seattleheatpumpco.com/guide/how-to-compare-heat-pump-quotes/) goes line by line, and the [cost estimator](https://seattleheatpumpco.com/tools/heat-pump-cost-estimator/) gives you a range for your own house to hold quotes against.

## Getting a real number

A published range gets you oriented. A real price needs the house measured: the heat loss, the ducts, the panel and the yard. That measurement is the assessment, and it is the first step of every [ducted heat pump installation](https://seattleheatpumpco.com/ducted-heat-pump-installation/). Call the number on this page or send a few details, and the estimate will be built around your house rather than a package.

## Questions

### Why did I get heat pump quotes thousands of dollars apart for the same house?

Usually because the quotes cover different scopes. One may include duct changes, a panel upgrade or an air handler that another leaves out, or assume a different size or efficiency tier. Ask each contractor for the load calculation, the equipment model numbers and a line-item scope, then compare like with like.

### Is heat pump installation cheaper in the off-season?

There's no published Seattle data showing a reliable seasonal discount. What changes by season is availability: demand spikes after a heat wave and at the first cold snap, which can stretch lead times. Planning in spring or early fall gives more scheduling room, especially when a furnace still works.

### Does a more efficient heat pump pay for itself?

Sometimes. A higher tier costs more up front, uses less electricity, and can qualify for City Light's $600 discount instead of $300. Whether it pays back depends on your heating load, your rate and how long you stay. The cost estimator compares tiers for your house.