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How much does single-zone ductless mini-split installation cost in Washington?
Updated September 2026 · Washington price index 1.19 for HVAC work (national = 1.00)
In Washington, an HVAC company typically charges $2,400 to $10,500 to install a single-zone ductless mini-split, with most jobs landing near $5,100. That is about 19% above the national average of $2,000–$8,800, based on what HVAC technicians earn in Washington.
AI-powered second opinion using these same Washington figures. No account, no card. Need someone to do the work? Verified pros in Washington took the Fair Price Pledge.
What a Washington quote means
| Quote for this job | What it means |
|---|---|
| Under $1,440 | Suspiciously low — ask what is excluded, and check licensing and insurance |
| $1,440 – $11,550 | Fair price — inside the typical range (up to 10% over the top is still normal) |
| $11,550 – $18,375 | Running high — get the quote itemized, and get a second one |
| Over $18,375 | Ripoff territory — more than 1.75× the high end of the typical range |
Same rules the QuoteJury checker uses on every quote.
What you're paying for
What is usually included: The outdoor unit and one indoor head, line set and drain, a dedicated electrical circuit, mounting, vacuum and charge, permit and startup, in 4–8 hours.
What moves the price:
- System size (9,000–24,000 BTU) and efficiency tier
- Line set length and whether the electrical circuit already exists
- Brand: premium Japanese brands versus value brands
- Wall versus ceiling cassette indoor units
- Permit fees
BTU size and brand tier (Mitsubishi/Daikin vs budget), line-set length and wall/ceiling mount type, need for a dedicated electrical circuit, and permits.
Single-zone ductless mini-split installation cost across Washington
Typical range by metro and rural area, from BLS wage data for HVAC technicians in each area.
| Area | Typical range | Most jobs |
|---|---|---|
| Bellingham, WA | $2,250 – $10,000 | $4,800 |
| Bremerton-Silverdale-Port Orchard, WA | $2,350 – $10,400 | $5,000 |
| Kennewick-Richland, WA | $2,350 – $10,200 | $4,950 |
| Longview-Kelso, WA | $2,100 – $9,300 | $4,500 |
| Mount Vernon-Anacortes, WA | $2,350 – $10,400 | $5,000 |
| Olympia-Lacey-Tumwater, WA | $2,400 – $10,500 | $5,100 |
| Seattle-Tacoma-Bellevue, WA | $2,550 – $11,200 | $5,400 |
| Spokane-Spokane Valley, WA | $2,050 – $9,100 | $4,400 |
| Walla Walla, WA | $2,050 – $9,000 | $4,350 |
| Wenatchee-East Wenatchee, WA | $2,000 – $8,800 | $4,250 |
| Yakima, WA | $2,050 – $9,100 | $4,350 |
| Eastern Washington nonmetropolitan area | $2,150 – $9,400 | $4,550 |
| Western Washington nonmetropolitan area | $2,050 – $8,900 | $4,300 |
Frequently asked
Is $5,100 a fair price for single-zone ductless mini-split installation in Washington?
Yes. $5,100 is right around what most homeowners in Washington pay. Anything from $1,440 to $11,550 is inside the normal range for an HVAC company; above $11,550 it is worth getting a second quote.
Why do quotes for the same job vary so much?
System size (9,000–24,000 BTU) and efficiency tier. Line set length and whether the electrical circuit already exists. Company overhead matters too: a large company with trucks, dispatchers and a warranty department charges more than a one-person shop, and both can be honest prices.
When should I get a second quote?
Any time a quote lands above $11,550, or when the contractor cannot break it into parts, labor and fees. Ask for the itemized version, ask what would change the price, and confirm licensing and insurance. You can also paste the quote into the free QuoteJury checker for an instant second opinion.
Other HVAC jobs in Washington
- AC capacitor replacement
- AC contactor replacement
- Condenser fan motor replacement
- Furnace or air handler blower motor replacement
- AC refrigerant recharge (R-410A)
- Evaporator coil replacement
- AC compressor replacement
- AC condenser (outdoor unit) replacement
- Full central AC system replacement (~3 tons)
- Gas furnace replacement
- Furnace ignitor or flame sensor replacement
- Smart thermostat installation
- HVAC service call and diagnostic fee
Single-zone ductless mini-split installation in other states
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Sources
- HomeGuide (2025): $2,500–$6,000 nationally
- Angi (2026): $2,000–$8,800 nationally
- Bob Vila (2024): $2,000–$8,800 nationally
- U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025 — median hourly wages by state and metro area
About these numbers. Ranges are typical market rates for a licensed, insured contractor, blended from published U.S. cost guides and adjusted with U.S. Bureau of Labor Statistics wage data (OEWS, May 2025) for each state and metro area. They are estimates, not a bid, appraisal or inspection. Real prices move with parts, access, permits and code requirements. The quote checker is AI-powered and labeled as such.