Rooms with no ductwork, like additions, converted attics, garages, or ADUs
Air Conditioning · Seattle, WA
Mini Split Installation in Seattle, WA
Mini split installation in Seattle typically costs $3,800 to $9,500 installed, depending on zone count and unit capacity. SPS Pro Services installs ductless heat pumps throughout King and Snohomish counties, with most single-zone jobs finished in a day and multi-zone systems completed within two to three days.
Typical cost$3,800–$9,500
WarrantyWorkmanship warranty
AvailabilitySame-week visits
HoursMon–Fri 8am–6pm
Seattle's marine climate puts a different kind of strain on ductless systems than drier parts of the state. Damp air off Puget Sound means outdoor condenser coils face near-constant moisture and biofilm buildup, and winter cold snaps below freezing trigger frequent defrost cycles that can shorten compressor life if the unit is undersized. We size and place equipment to handle both wet shoulder seasons and the occasional hard freeze without overworking the compressor.
Local knowledge
What's different about mini split installation in Seattle
We run service calls in Seattle every week — the same patterns come up again and again.
Seattle's older housing stock, common in neighborhoods like Ballard, Wallingford, and Maple Leaf, often has no existing ductwork, making ductless mini splits a practical way to heat and cool single rooms, additions, or basement conversions.
Marine air off Puget Sound keeps outdoor condenser units exposed to near-constant moisture, so we mount them on elevated brackets with corrosion-resistant coils to slow coil degradation and extend equipment life.
Seattle City Light electric rates make heat pump mini splits significantly cheaper to run than the electric baseboard or wall heaters found in many older Seattle apartments, ADUs, and rental units.
Symptoms we see daily
Signs you need mini split installation in Seattle
Relying on electric baseboard heat or portable window AC units
Uneven temperatures between floors or rooms fed by the same central system
Rising electric bills tied to old resistance heaters
No central air and summer afternoons are becoming hard to live with
No surprises
How a Seattle mini split installation visit works
1
Home Assessment & Load Calculation
We walk the space, check insulation and window exposure, and run a load calculation so the system is sized correctly for Seattle's mild but damp climate instead of oversized or undersized.
2
System Design & Zone Placement
We map out indoor head locations and outdoor condenser placement, accounting for rain exposure, roofline drip lines, and available exterior wall space typical of Seattle homes.
3
Electrical & Refrigerant Line Installation
Our techs run the dedicated electrical circuit and refrigerant lineset through the wall penetration, sealing it against moisture intrusion common in Seattle's wet months.
4
Mounting & Commissioning
Indoor heads are mounted and leveled, the outdoor unit is set on a stable pad or elevated bracket, and the system is charged with refrigerant and vacuum-tested for leaks.
5
Testing & Walkthrough
We test heating and cooling modes, confirm the condensate drain flows properly given local rainfall, and walk you through the remote and thermostat settings before we leave.
Flat-rate pricing
Mini Split Installation in Seattle — what it costs
Conservative ranges for the Seattle metro. Your written quote is exact before work begins.
| Job | Typical price |
|---|---|
| In-home estimateExact flat quote for your home | Free |
| Standard mini split installationTypical single-system job | $3,800–$5,700 |
| Mid-range mini split installationHigher-capacity or multi-zone equipment | $5,700–$7,600 |
| Complex mini split installationPremium equipment or difficult access | $7,600–$9,500 |
Prices reviewed by Sergei Petrov · July 2026. Parts availability can shift ranges — the quote you sign is final.
24/7 Emergency Line
Emergency dispatchNo cooling at 11pm? We pick up.
Office hours are Mon–Fri, but the emergency line never closes. Call any hour and we dispatch a licensed tech across Greater Seattle.
Straight answers
Mini Split Installation in Seattle — FAQ
Do mini splits work well in Seattle's rainy winters?
Yes. Cold-climate heat pump mini splits rated down to around 5 degrees Fahrenheit handle Seattle's typical winter lows in the high 30s and low 40s without issue. The bigger challenge is moisture, so we install units with weatherproof drain lines and rust-resistant outdoor housings built for year-round rain.
How long does installation take at a typical Seattle home?
Single-zone installs in Seattle craftsman and bungalow-style homes usually take one day since indoor and outdoor units mount directly to existing walls without major structural changes. Multi-zone systems with three or more indoor heads typically run two to three days.
Can a mini split replace old wall heaters in a Seattle ADU?
Yes. We regularly convert electric baseboard and wall heaters in Seattle ADUs and basement conversions to single-zone mini splits, which lowers heating costs since heat pumps use Seattle City Light electricity far more efficiently than resistance heat.
Do you install mini splits outside Seattle proper?
We install and service mini splits throughout King and Snohomish counties, including Bellevue, Redmond, Kirkland, Sammamish, and Issaquah, in addition to Seattle neighborhoods from Ballard to Rainier Valley.
Founder & Lead HVAC Technician, SPS Pro Services
EPA Section 608 UniversalNATE Core Certified14+ years in the trade
Reviews the pricing and service guidance on this page against SPS Pro Services's actual job records in Seattle and across the Seattle metro.
Prices reviewed July 2026
Also in Seattle
Other services our crew handles on the same routes.
Need mini split installation in Seattle?
Call (206) 427-8907 to schedule a mini split installation estimate for your Seattle home, Monday through Friday 8am to 6pm.