Heat Pump Cost in DuPont & Steilacoom, WA (2026 Numbers)

DuPont and Steilacoom are twenty minutes apart on the same stretch of Pierce County shoreline, and almost nothing about their heat pump math is the same. One is a 1990s planned community with good ductwork and the coldest design temperature in our service area. The other is Washington's oldest incorporated town, sits on salt water, and prices in a different market tier.

So here are both sets of 2026 numbers, side by side, with the reasons behind the gap.

What a heat pump costs in DuPont in 2026

DuPont is a standard market. These are installed prices — equipment, labor, materials, permit.

Most of DuPont was built in the Northwest Landing era — late 1990s through the 2000s — which is the friendliest housing stock we work in. Ductwork is relatively young, the equipment closet or garage mechanical space is where the plans said it would be, electrical panels are 200 amp, and the outdoor unit usually has a clean side-yard location. That keeps a ducted heat pump install in the middle of the range rather than the top of it.

What a heat pump costs in Steilacoom in 2026

Steilacoom is an affluent market, which carries a 15 to 20 percent premium.

That premium is not a surcharge for the view. Steilacoom homes are older and more varied: waterfront and bluff properties with difficult equipment access, small original floor plans that were added onto, crawl spaces that are tight and damp, and a historic district that cares where a condenser goes. All of that is labor. Some of these homes also have no usable ductwork at all, which pushes them into the ductless mini-split lane instead.

The 12-degree problem nobody mentions

Washington's energy code assigns every city a winter outdoor design temperature, and that number is what a load calculation is run against. DuPont is 17°F. Steilacoom is 29°F.

Twelve degrees is an enormous spread for two towns this close together. DuPont is grouped with Olympia, Lacey, Tumwater and Yelm — the coldest design temperatures we work with anywhere. Steilacoom sits in the warmest group with Tacoma, Lakewood and Gig Harbor, where Puget Sound's water moderates everything.

What it means in practice:

• A DuPont home needs more capacity than a Steilacoom home of identical size. Not dramatically more, but enough that copying a neighbor's tonnage from across the freeway is a mistake.
• Backup heat strategy differs. Both towns are genuinely good heat pump territory — neither gets anywhere near the range where a modern system struggles. But in DuPont we size and set the backup stage more carefully, because the system will actually see the teens some winters.
• Sizing shortcuts cost you twice. Oversize it and the system short-cycles, dehumidifies poorly and wears out early. Undersize it and it leans on resistance heat during the cold snap, which is exactly the electricity you bought the heat pump to stop using.

Every Varsity estimate includes a Manual J load calculation at no extra cost. On a 17-degree design day, that is not paperwork — it is the difference between right and roughly right.

Rebates follow the meter, not the county

This is the single most expensive thing to get wrong, because both towns are in Pierce County and neither one's rebate is decided by that fact.

Steilacoom

Parts of Steilacoom are served by Tacoma Power, which runs its own heat pump rebate program plus a 0% interest loan of up to $20,000 for qualifying efficiency work. That combination is one of the better deals in the region, and it is worth confirming before you shop. Not every Steilacoom address is on it, though — which is why we start by looking at the power bill rather than the map.

DuPont

DuPont is billed by one investor-owned utility for both electricity and natural gas. That makes it simpler: no boundary to chase, one program to check. Local utility rebates may apply, and the amount depends on what is being replaced and the efficiency of the equipment installed. Converting from electric baseboard or a wall furnace generally earns more than swapping a working heat pump for a newer one.

Two honest caveats on all of it. Programs change their amounts and their equipment requirements, and they pay only through their own contractor networks — so we confirm the current rules before quoting rather than after. And the federal 25C tax credit ended December 31, 2025. No 2026 installation qualifies, regardless of what an old blog post or a door knocker tells you. The full picture is in our Washington heat pump rebates guide.

What actually moves your price

The spread between $12,000 and $21,600 is not mystery pricing. It is these six things:

1. Load and tonnage. Most homes in both towns land between 2 and 4 tons.
2. Ductwork condition. DuPont ducts are usually reusable. Older Steilacoom ducts sometimes are not, and duct repair or replacement runs $3,000 to $8,000 standard, $4,000 to $10,000 for larger or more complex layouts.
3. Equipment tier. Good, Better, Best. Single-stage versus two-stage versus variable-speed drives both comfort and the quote.
4. Electrical scope. A ducted heat pump wants a 30 to 40 amp 240V circuit. Most homes in both towns already have the panel capacity.
5. Site conditions. Bluff access, crawl space height, line-set routing, pad location.
6. Salt air hardware. For waterfront Steilacoom homes, corrosion-resistant coil coatings are money well spent.

When a heat pump isn't the answer

We will say so. If your gas furnace is five years old and healthy and all you want is cooling, keeping the furnace and pairing it with a heat pump as a hybrid system — or adding AC alone — can be the better spend. If your heat pump is eight years old with a $400 repair in front of it, fix it. Replacement at $10,000 to $16,000 is not the answer to every problem, and pretending otherwise is how homeowners end up with buyer's remorse and a contractor who doesn't call back.

What replacement does buy you is a 10-year parts and labor warranty on every install, most jobs finished in one day, and the permit pulled and inspected properly.

Get your DuPont or Steilacoom number

For town-specific detail, see our DuPont heat pump page or Steilacoom heat pump page. For the full regional cost breakdown, start with the Washington heat pump cost guide.

When you're ready for real numbers on your house, request a free in-home estimate or call (253) 785-4622, Monday through Friday, 8 to 6. We're owner-operated out of Federal Way, twenty minutes up I-5, and we'll tell you which utility bills your meter before we tell you what anything costs.