Direct answer · the Seattle cost range in 2026
$12,800 to $24,500 net for a complete cold-climate heat pump install in Seattle after the $1,200 PSE Trade Ally instant rebate. Before the rebate, the gross range is $14,000 to $25,700. The federal Inflation Reduction Act tax credit can take another $2,000 off your tax bill the following spring, bringing the effective net for most homeowners to $10,800 to $22,500.
The range is wide because what you pay depends on five specific things. We'll go through each.
What drives the price
01System size (tonnage)
Heat pumps are sized in "tons" of cooling/heating capacity. One ton = 12,000 BTU of heat transfer per hour. Seattle homes mostly need 2 to 5 tons depending on square footage, ceiling height, insulation, window count, orientation, and air sealing.
We calculate this with a Manual J load calculation, a measured analysis, not a square-foot estimate. Square-foot rules of thumb (the "1 ton per 600 sq ft" you'll see online) consistently oversize equipment in Seattle's mild climate. Oversized heat pumps short-cycle, wear out 5 to 8 years sooner, and produce uneven room temperatures.
| System size | Typical home | Gross cost | Net after rebate |
|---|---|---|---|
| 2 ton · 24,000 BTU | 1,200–1,500 sq ft, tight envelope | $14,000–$17,500 | $12,800–$16,300 |
| 3 ton · 36,000 BTU | 1,500–2,200 sq ft, average | $16,500–$20,200 | $15,300–$19,000 |
| 4 ton · 48,000 BTU | 2,200–2,800 sq ft, larger | $18,400–$23,000 | $17,200–$21,800 |
| 5 ton · 60,000 BTU | 2,800–3,500 sq ft, older insulation | $21,000–$25,700 | $19,800–$24,500 |
02Equipment line
There are three main cold-climate heat pump lines we install. The hardware cost differences run a few thousand dollars and the warranty / sound / cold-weather performance tradeoffs are real.
Mitsubishi M-Series (Premium). Inverter-driven hyper-heat. Rated capacity at -15°F. Lowest sound at 51 dB outdoors (quieter than a typical conversation). 12-year compressor warranty. Adds $2,000–$3,500 to gross cost versus the value tier. Best for homes where occupants are sound-sensitive (close neighbors, bedroom near outdoor unit) and where cold-weather performance matters.
Bosch IDS 2.0 (Value). Inverter-driven. Rated to -4°F. 18–21 SEER. 10-year compressor warranty. Strong balance. This is what we install on the majority of Seattle and Bellevue homes.
Trane XR / XV (Workhorse). Two-stage variable. Rated to 5°F. Heavy-duty cabinet for high-cycle homes (vacation properties, rentals). 10-year compressor warranty. Adds $500–$1,200 to gross cost over Bosch.
03Existing ductwork condition
Modern heat pumps move more air at lower pressure than older furnaces. Sometimes existing ductwork works fine. Sometimes it doesn't.
| Ductwork state | Impact on cost |
|---|---|
| Existing returns and supplies are adequate | $0 |
| Need to enlarge 1–2 return ducts | + $400–$800 |
| Need to add a return in a previously-undersized room | + $600–$1,400 |
| Need to redesign duct system entirely (rare) | + $2,500–$5,000 |
We measure static pressure during the consult to confirm the existing system can handle the new equipment. About 1 in 5 Seattle homes needs modest duct modifications.
04Electrical panel
This is the variable that surprises most homeowners. A 4-ton cold-climate heat pump needs a dedicated 40-amp 240V circuit. Whether your panel can accept that circuit depends on the panel's amperage rating and current load.
| Panel state | Impact on cost |
|---|---|
| 200A panel with open spaces, existing service | $0 |
| 200A panel maxed out, need sub-panel or load shedding | + $1,800–$3,200 |
| 100A panel, needs upgrade to 200A before heat pump install | + $2,800–$4,500 |
| Federal Pacific / Zinsco panel, replacement required regardless | + $2,800–$4,500 (solves a different problem) |
Read the panel upgrade deep-dive for the full picture.
05Refrigerant line run
The outdoor unit needs to connect to the indoor air handler via a copper refrigerant line set. Short runs (under 30 feet) are standard and priced into the base quote. Long runs (basement-to-attic, garage-to-second-floor) add cost.
- Standard run (under 30 ft): $0 (included)
- Medium run (30–50 ft): + $300–$600
- Long run (50–80 ft): + $700–$1,400
- Unusual: roof-routed through chase, custom carpentry: + $1,500+
Get your number with a free on-site Manual J.
PSE Trade Ally · $1,200 instant rebate priced in · Written quote in 24–48 hours.
Real Seattle installs from 2026
To make this concrete, here are five actual heat pump installs we've quoted or completed in early 2026. Names and addresses anonymized; numbers are real.
Bellevue craftsman · 2,400 sq ft · 1986 build
- 4-ton Mitsubishi M-Series hyper-heat
- Existing 100A panel, upgraded to 200A as part of project
- Standard ductwork (no mods)
- Standard line run
Wallingford 1920s craftsman · 1,650 sq ft · original panel
- 3-ton Bosch IDS 2.0
- Existing 60A panel, upgraded to 200A
- Knob-and-tube remediation needed in 2 rooms (insurance required)
- 1 return duct enlarged
Newer Capitol Hill build · 2,100 sq ft · 2008
- 3-ton Bosch IDS 2.0
- Existing 200A panel, no upgrade needed
- Standard ductwork
- Standard line run
Magnolia mid-century split-level · 1,800 sq ft · 1962
- 3-ton Bosch IDS 2.0
- Existing 100A panel, upgrade to 200A bundled
- 2 return ducts enlarged
- Long line run (52 ft, through chase)
Bridle Trails (Bellevue) larger home · 3,200 sq ft · 2002
- 5-ton Mitsubishi M-Series hyper-heat
- Existing 200A panel, load-shedding device added (saved $3,000 vs upgrade to 400A)
- Standard ductwork
- Standard line run
Homes 1980–2005 with existing 200A panels and decent ductwork land $14,000–$18,000 net.
Homes pre-1980 with original panels or wiring land $19,000–$24,000 net.
How the PSE rebate works
PSE's Trade Ally program offers a $1,200 instant rebate on qualifying cold-climate heat pumps installed by approved contractors. We're a Trade Ally, so the rebate is applied directly to your quote as a discount, you don't fill out forms, you don't wait for reimbursement, you don't get billed twice.
To qualify:
- Heat pump must meet PSE efficiency criteria (current standard: HSPF2 ≥ 7.5, SEER2 ≥ 15.2)
- Installed by a Trade Ally contractor
- Replacing existing electric resistance heat OR no AC (most homes qualify)
- PSE customer (not Seattle City Light only)
Some Seattle homes are in Seattle City Light territory for electric and PSE for gas. The PSE rebate is gas-side, so even City Light electric customers can qualify if PSE is your gas utility (you have a PSE bill).
How the federal tax credit stacks
The Inflation Reduction Act's Section 25C provides a 30% tax credit up to $2,000 for qualifying heat pump installs. This is in addition to the PSE rebate, not instead of it.
How it works:
- You pay the full quoted amount (after PSE rebate is applied as discount)
- We provide an AHRI certificate and IRS form documentation
- When you file your taxes for the year of install, you claim the credit
- Refund (or reduction in taxes owed) the next spring
A $15,000 net install would qualify for a $2,000 tax credit (the cap). A $7,000 net install would qualify for $2,100 (30%) but is capped at $2,000.
This credit is technically nonrefundable, meaning you can only claim up to what you owe in federal taxes that year. Most middle-income homeowners owe more than $2,000 in federal tax, so this isn't usually a constraint. Check with a tax preparer if your income is below the median.
What doesn't change the price
A few things people assume affect the price that mostly don't:
- Brand loyalty. Mitsubishi adds cost; Bosch and Trane are similar to each other. The premium is real but small.
- Smart thermostat upgrade. Most installs include a basic programmable thermostat. Upgrading to Ecobee or Nest adds $250–$450, your install cost doesn't depend on it.
- Aesthetic preferences. Cabinet color, mounting bracket style. We accommodate but it doesn't move the price meaningfully.
- Day of the week. We don't charge a weekend premium for scheduled installs. Same price Wednesday or Saturday.
Reasonable warning signs in quotes
If you've gotten quotes from multiple contractors and they vary by more than 30 percent, here are the most common reasons one quote is way off:
Too cheap (under $11,000 net for a 3–4 ton)
- Installing a non-cold-climate unit (will need backup heat in January, expensive)
- Skipping panel work that's actually required
- Skipping permit (illegal and your insurance won't cover failures)
- "Bait and switch", quote is for a basic system, upsell happens on install day
Too expensive (over $26,000 net for a 3–4 ton)
- Oversized equipment (5-ton on a 1,800 sq ft home)
- Unnecessary ductwork rebuild
- Padding ("equipment efficiency upgrade" that's actually standard)
- Markup on permit fees (permit is $300–$700 typically; if a contractor quotes $2,000 for "permit and compliance," walk away)
What to ask in your next consult
Three questions that separate honest contractors from upsellers:
- "Can I see the Manual J load calculation?" If they don't have one, they're sizing by square footage and probably oversizing.
- "Is the PSE rebate priced into this quote or do I file for it after?" Trade Allies price it in. Non-Trade-Allies make you file paperwork (you might never see the money).
- "What's not included in this number?" Permit, panel work, gas line capping, old equipment disposal, should all be in the quote. If they say "extra" to any of these, the quote is incomplete on purpose.
Ready to get your number?
Black Lotus is a PSE Trade Ally and the $1,200 instant rebate is applied to every qualifying quote. Manual J load calculation on every install. Three Seattle-born partners with over 30 years of combined HVAC experience between us.
Call (206) 200-9134 or schedule online. Free on-site consult; written quote in 24 to 48 hours.