# How Much Does Heat Pump Replacement Cost in Seattle?

> Heat pump replacement cost in Seattle: like-for-like swaps typically run $6,700 to $15,000. See what the refrigerant change, air handler and permits add.

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

Updated: 2026-10-21

*What it costs to replace an existing ducted heat pump in the Seattle area, why the refrigerant rule changes the scope, and which parts of a quote are worth questioning.*

Heat pump replacement cost in the Seattle area typically runs about $6,700 to $15,000 for a like-for-like swap of an existing ducted heat pump, based on published cost data. A new air handler, duct corrections, a new line set or more electrical capacity can push it higher; City Light's $300 or $600 discount brings it down.

**Key takeaways**

- Like-for-like ducted heat pump replacement: about $6,700 to $15,000 in the Seattle area.
- Air handler replacement on its own: about $1,500 to $4,200 in national figures.
- Washington's refrigerant rule means most replacements now change the indoor coil as well as the outdoor unit.
- Seattle permits for a replacement: from $81.95 for refrigeration alone, up to about $556 with electrical and mechanical work.

These are budgeting ranges for Seattle-area projects, not quotes. [The Seattle Heat Pump Company](https://seattleheatpumpco.com/) publishes them so you can see where a replacement estimate sits before you sign. The Seattle Heat Pump Company plans and manages [heat pump replacement](https://seattleheatpumpco.com/heat-pump-replacement/) projects in Seattle and King County, with the work carried out by licensed and insured contractors.

## Replacement costs at a glance

A replacement starts from a house that already has a heat pump, ducts and a circuit. That is why its range tops out lower than a first-time [ducted heat pump installation](https://seattleheatpumpco.com/ducted-heat-pump-installation/), which runs about $6,700 to $20,000 on usable ducts. The table collects the figures that come up on most replacement quotes.

| Job or add-on | Typical range | What the range covers |
|---|---|---|
| Like-for-like heat pump replacement | $6,700–$15,000 | New outdoor unit and matched indoor coil or air handler on existing ducts, reusing the circuit and, where it tests sound, the line set |
| Air handler replacement | $1,500–$4,200 | Indoor fan and coil cabinet, national figures (HomeGuide; Carrier) |
| Electrical panel upgrade, 100 to 200 amps | $1,333–$4,500 | Only when the replacement adds load the panel cannot carry |
| Whole-house duct replacement | $1,400–$5,600 | HomeGuide national figures; Fixr runs from about $1,900 to about $17,100 for complex installs |
| Smart thermostat, installed | $200–$500 | Heat pump compatible thermostat, national figures |
| Seattle permits | $81.95–$556 | Refrigeration permit always; electrical and mechanical permits when that work changes |

National cost publishers frame ducted heat pumps more broadly, at about $5,000 to $15,000 (Fixr) or $4,000 to $12,000 on existing ducts (HomeGuide). Seattle-area replacement figures start above the low end of those national ranges, and the published local data does not support the lowest national numbers here. If you are adding a heat pump for the first time, the [installation cost guide](https://seattleheatpumpco.com/guide/heat-pump-installation-cost-seattle/) is the better reference.

## Replacement, repair or conversion: which job is this?

The word "replacement" covers three different jobs, and each prices differently. Sorting out which one you have is the first step toward reading a quote.

**A repair** fixes one failed part on a system that is otherwise sound: a capacitor, a contactor, a fan motor, a sensor or a control board. Repairs are not covered by the ranges on this page. A repair makes sense when the system has kept the house comfortable, the refrigerant circuit is tight, and the failed part is not the compressor.

**A replacement** swaps the heat pump system for a new one on the same ducts and, usually, the same circuit. This is the $6,700 to $15,000 job. It becomes the better answer when the compressor fails, when an old coil keeps leaking refrigerant, or when the system never carried the house well in the first place.

**A conversion** changes what heats the house: a gas or oil furnace gives way to a heat pump. Those projects add scope a replacement does not have, such as a new circuit, an air handler where a furnace stood, or an oil tank decommissioning. See [furnace to heat pump conversion](https://seattleheatpumpco.com/furnace-to-heat-pump-conversion/) or the [oil conversion cost guide](https://seattleheatpumpco.com/guide/oil-to-heat-pump-conversion-cost/) if that is your situation.

## What moves a replacement price

Two replacement quotes for the same house can differ by thousands of dollars. Most of that gap traces to a handful of decisions.

### Size: why the old nameplate is not the answer

The fastest way to quote a replacement is to read the tonnage off the old outdoor unit and order the same size. That is also the most common way to get it wrong. The house may have gained attic insulation, new windows or air sealing since the original install, and the original may have been oversized to begin with. Seattle's energy code requires heating and cooling loads calculated with ACCA Manual J and equipment selected with Manual S, no larger than the smallest size that meets the load.

Size affects price directly, since bigger equipment costs more, and indirectly, since an oversized system short-cycles and an undersized one leans on backup heat. The [sizing guide](https://seattleheatpumpco.com/guide/heat-pump-sizing-manual-j/) explains what a load calculation measures.

### Efficiency tier

Tier is usually the biggest lever inside the equipment price. A single-stage unit at the federal minimum sits at the bottom of the range. A variable-speed system with high SEER2 and HSPF2 ratings sits near the top, and it tends to run quieter and handle [Seattle's long, mild heating season](https://seattleheatpumpco.com/guide/do-heat-pumps-work-in-seattle-winter/) with fewer on-off cycles. City Light's contractor discount follows the 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 limited to one system per home and is paid through participating distributors and contractors. City Light strongly recommends passing it to the customer, so ask to see it on the invoice. The [ratings guide](https://seattleheatpumpco.com/guide/seer2-hspf2-ratings-explained/) shows how to check a matched system's ratings, and the [variable-speed comparison](https://seattleheatpumpco.com/guide/variable-speed-vs-single-stage-heat-pump/) covers whether the higher tier is worth it for your house.

### Outdoor unit only, or the whole matched system

This driver changed the most when the refrigerant rule took effect. Since January 1, 2026, Washington's Department of Ecology has required newly installed residential heat pumps and air conditioners to use refrigerants with a global warming potential under 750. R-410A, the refrigerant in most heat pumps installed over the past 15 years, does not qualify.

A new outdoor unit therefore runs on a newer refrigerant such as R-454B or R-32. Those refrigerants operate at different pressures and are mildly flammable, and the equipment is rated and listed as a matched outdoor and indoor pair. An indoor coil built for R-410A is generally not part of that rated match, and many indoor units designed for the newer refrigerants include a leak sensor that older coils lack. The practical result: a replacement that once might have been an outdoor-unit swap now usually includes a new indoor coil or a new air handler. That is the main reason replacement quotes have climbed toward the middle of the range. The [refrigerant change guide](https://seattleheatpumpco.com/guide/heat-pump-refrigerant-change/) covers the details for older systems.

### Air handler replacement cost

If the existing heat pump uses an electric air handler, the replacement decides whether that cabinet stays or goes. Keeping it is only an option when its coil can be swapped for one matched to the new outdoor unit and the blower is in good shape. Often the cleaner answer is a new air handler with a variable-speed blower.

Air handler replacement on its own runs about $1,500 to $3,400 in HomeGuide's national figures, with Carrier's figures reaching about $4,200. What pushes it higher is location and what is inside the cabinet. An air handler in a tight attic or crawlspace takes more labor than one in a basement. Electric backup heat strips add cost and electrical load, and the strip size should follow the load calculation rather than the old unit, with [lockout settings](https://seattleheatpumpco.com/guide/heat-pump-backup-heat-settings/) that meet Seattle's energy code. Duct transitions also matter when the new cabinet has a different footprint. The [air handler replacement](https://seattleheatpumpco.com/air-handler-replacement/) page covers that service on its own.

### Line set: reuse or replace

The refrigerant lines between the outdoor unit and the indoor coil can sometimes be reused. Whether they should be depends on their diameter compared with the new equipment's requirements, their length, the condition of the insulation, whether they show kinks or corrosion, and whether the old system ever burned out a compressor and contaminated the lines. The manufacturer's installation instructions set the limits.

A reused line set still needs a nitrogen pressure test and a deep vacuum verified with a micron gauge before the new refrigerant goes in. A replaced line set adds material and labor, more so when the route runs through finished walls, a second floor or a long crawlspace. There is no reliable published figure for line set replacement in Seattle, so treat it as a quote line to ask about rather than a number to plug in.

### Ducts and airflow

A replacement inherits whatever the old system's ducts could deliver. If some rooms always ran cold, the blower was loud, or backup heat came on often, the ducts may be part of the reason. A static pressure test before the new equipment is chosen tells you whether the ducts work as they are, need a return added or joints sealed, or need more. Replacing a heat pump without checking airflow can carry the old comfort problems straight into the new system. See [heat pumps with existing ductwork](https://seattleheatpumpco.com/heat-pump-existing-ductwork/) for what the test measures.

### Electrical work

A like-for-like replacement can often reuse the existing circuit and disconnect, if the new equipment's electrical requirements fit them. Electrical scope grows when the new system draws more current, when backup strips are larger, or when the existing wiring or disconnect is worn or undersized. A full service upgrade is uncommon on a straight replacement, but when it is needed, 100 to 200 amps typically runs about $1,333 to $4,500 in the Seattle area. The [panel guide](https://seattleheatpumpco.com/guide/heat-pump-electrical-panel-requirements/) covers how capacity is checked.

### Access, pad, drain and siting

A rear-yard unit on a sound pad with a short run to a basement air handler is the easy case. Costs rise for a new pad or wall bracket, a condensate drain that needs rerouting or an overflow switch, roof or second-story access, and side-yard locations. In Seattle, a side-yard outdoor unit needs a noise review, and a predicted property-line level above 47 dBA on the heating rating means a quieter model, a barrier, a compressor blanket or a different spot. The [noise guide](https://seattleheatpumpco.com/guide/seattle-heat-pump-noise-ordinance/) explains the review.

## Seattle permit fees for a replacement

Permit fees are fixed by the city, which makes them a useful check on a quote. The Seattle Department of Construction and Inspections' current fee schedule sets these amounts, each including the 5% technology fee:

| Seattle permit | Fee | When it applies on a replacement |
|---|---|---|
| Refrigeration permit | $81.95 | Every split-system heat pump replacement; only a licensed refrigeration contractor can obtain it |
| Electrical permit, circuit | $110.38 | When the circuit or disconnect is replaced or changed |
| Electrical permit with 200 amp service | $410.84 | When the replacement includes a service upgrade |
| Mechanical permit, heat pump | $63.37 per unit | When the air handler or other indoor equipment is replaced or altered |

A straight outdoor and coil replacement may need only the refrigeration permit. A replacement with a new air handler and new circuit lands around $256. A typical job runs about $192 to $556 depending on scope. Seattle inspections include a cover inspection before anything is concealed and a final inspection, where the inspector checks that the backup heat lockout is set to 35°F or lower. Suburbs differ: Bellevue requires a mechanical permit for a heat pump, and electrical permits in Shoreline and Lake Forest Park go through Washington Labor & Industries. The [permit guide](https://seattleheatpumpco.com/guide/seattle-heat-pump-permit/) lists who pulls what.

## Incentives on a replacement

Fewer incentives apply to replacing a heat pump than to converting from oil or gas, so it pays to know which ones survive:

- **Seattle City Light** contractor discount: $300 at SEER2 15.2 and HSPF2 8.1 (retrofits), or $600 at SEER2 16.0 and HSPF2 9.5, one system per home, for City Light customers in Seattle and its suburban service area.
- **PSE** rebates in PSE electric territory focus on conversions, such as replacing electric resistance heat or adding a heat pump to a gas furnace. A heat-pump-for-heat-pump swap does not match those programs, so confirm with PSE before counting on a rebate.
- **The federal 25C tax credit** ended for equipment placed in service after December 31, 2025, so a replacement today does not qualify.

The [rebate guide](https://seattleheatpumpco.com/guide/heat-pump-rebates-seattle/) keeps the full list current, and the [PSE rebate guide](https://seattleheatpumpco.com/guide/pse-heat-pump-rebates/) covers Eastside programs.

## Three example replacement budgets

These are illustrative combinations of the published ranges above, not quotes for any real house.

| Example | Main work | Add-ons | Incentive | Budget picture |
|---|---|---|---|---|
| R-410A heat pump on a gas furnace, compressor failed, ducts test fine | New outdoor unit and matched coil on the existing furnace | Thermostat reconfigured | City Light $300 or $600 by tier | Lower half of the $6,700–$15,000 replacement range |
| Heat pump with an aging electric air handler in the basement | New outdoor unit and new variable-speed air handler | Backup strips resized to the load, mechanical permit | City Light $600 at Tier 3 | Middle to upper part of the replacement range |
| Eastside heat pump, rooms always ran cold | New matched system plus an added return and duct sealing | Possible line set replacement | Confirm with PSE | Replacement range plus duct work |

## Timing: replace before it fails, or wait?

A heat pump that dies in a cold snap or a heat wave gets replaced on whatever terms are available that week. Seattle saw that after the June 2021 heat dome, when homeowners reported estimates booked months out. Planning a replacement while the old system still runs lets you get the load calculation, compare quotes on equal terms and choose a tier deliberately.

Waiting is reasonable when the system still heats and cools the house well, holds its refrigerant charge, and has no recurring repairs. There is no single reliable lifespan figure to plan around, so age alone is a weak trigger. Recurring refrigerant top-offs are a stronger one, because they mean a leak, and on an R-410A system each repair spends money on equipment that can no longer be replaced in kind. The [maintenance guide](https://seattleheatpumpco.com/guide/heat-pump-maintenance/) covers what keeps a system running longer.

## Reading a replacement quote

Replacement quotes are easiest to compare when they answer the same questions:

- the load calculation result and the design temperature used, rather than "same size as existing"
- outdoor and indoor model numbers, and the AHRI matched-system rating
- whether the indoor coil or air handler is being replaced, and why
- whether the line set is new or reused, and how a reused one will be tested
- the refrigerant the new system uses
- the electrical scope, and whether the existing circuit fits the new equipment
- which permits are included and who pulls the refrigeration permit
- whether the City Light discount appears on the invoice
- what commissioning covers: airflow, charge, defrost, and the backup heat lockout

A quote far below the range often skips the indoor coil, the line set test or the permits. One far above it may include duct work or an air handler you need, or a tier you do not. The [quote comparison guide](https://seattleheatpumpco.com/guide/how-to-compare-heat-pump-quotes/) walks through each line, and the [cost estimator](https://seattleheatpumpco.com/tools/heat-pump-cost-estimator/) gives you a range to hold quotes against.

## Getting a real number

A range tells you whether a quote is in the normal territory. A real price needs the house measured: the heat loss, the airflow, the existing line set, the circuit and the outdoor location. That assessment is the first step of every [heat pump replacement](https://seattleheatpumpco.com/heat-pump-replacement/) we plan. Call the number on this page or send a few details about the system you have now, and the estimate will be built around your house.

## Questions

### Does the refrigerant rule make a replacement cost more?

It can. Since January 1, 2026, Washington has required new residential heat pumps to use a refrigerant with a global warming potential under 750, and an indoor coil built for R-410A is generally not part of a rated match with a new low-GWP outdoor unit. That is why most replacements now change the indoor coil or air handler along with the outdoor unit.

### How much does air handler replacement cost on its own?

National cost guides put air handler replacement at about $1,500 to $3,400 (HomeGuide), with Carrier's figures reaching about $4,200. Electric backup heat strips, an attic or crawlspace location and duct transitions push it toward the top. On a full heat pump replacement, the air handler is usually part of the matched system price.

### Should I repair an old heat pump or replace it?

It depends on what failed and what the rest of the system looks like. A failed capacitor, contactor or fan motor on a sound system is a repair. A failed compressor, a refrigerant leak in an old R-410A coil, or a system that never kept the house comfortable points toward replacement, ideally with a fresh load calculation.