Rooms with no ductwork, like additions, converted attics, garages, or ADUs
Air Conditioning · Greater Seattle
Mini Split Installation in Greater Seattle
Mini split installation across Greater Seattle typically costs $3,800 to $9,500 depending on the number of indoor zones, heat pump capacity, and home layout. SPS Pro Services installs single and multi-zone ductless systems in King and Snohomish counties, sizing equipment for our marine climate and the older housing stock common throughout the region.
Licensed, bonded & insured in WashingtonMon–Fri 8am–6pm · 24/7 emergencies
Mini split installation adds ductless heating and cooling to homes without existing ductwork, room additions, garages, ADUs, or older houses relying on baseboard heat or window units. A typical installation includes the outdoor condenser, one or more indoor wall or ceiling cassettes, refrigerant line sets, a dedicated electrical circuit, and a startup check to confirm proper refrigerant charge. Homeowners across Seattle, Redmond, Everett, and surrounding King and Snohomish County communities choose ductless systems for room-by-room control and efficient heating through our wet winters and warm summers.
Symptoms we see daily
Signs you need mini split installation
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 mini split installation visit works
1
In-home assessment
We measure each room, check your electrical panel capacity, and identify the best wall or ceiling locations for indoor units and the outdoor condenser pad.
2
System sizing
BTU load is calculated per zone based on square footage, insulation levels, and window exposure so the system heats and cools without short-cycling.
3
Electrical and line set installation
A dedicated circuit is run to the outdoor unit, refrigerant line sets are routed through walls or crawlspaces, and the condenser pad is set.
4
Indoor unit mounting
Wall or ceiling cassettes are mounted, connected to line sets, and fitted with a condensate drain to remove moisture safely.
5
Startup and testing
Refrigerant charge is verified, each zone is tested for heating and cooling, and we walk through remote controls, filters, and basic maintenance.
Why quotes range from $3,800 to $9,500
These factors decide where your job lands in the range — and we walk you through each one on the written quote.
- Number of indoor zones or heads the home needs
- Line set length and routing complexity through crawlspaces or multiple floors
- Electrical panel capacity, since some older King and Snohomish County homes need panel upgrades
- Equipment brand and efficiency rating, including cold-climate heat pump models built for our winter lows
Flat-rate pricing
Mini Split Installation — 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 questions we hear most
Can a mini split fully replace my furnace?
Yes, cold-climate ductless heat pumps are built to heat efficiently even when outdoor temperatures drop into the 20s, which covers nearly every winter in King and Snohomish counties. Many homeowners use a multi-zone system as their primary heat source and keep an existing furnace as backup for the coldest stretches.
How many zones do I need?
Most single-family homes use two to four indoor units, one per main living area or bedroom. A single-zone system works well for one room, garage, or ADU, while larger homes often need a multi-zone outdoor condenser feeding several indoor heads.
Do I need a permit for a mini split?
Yes. Ductless installations in King and Snohomish counties require electrical and mechanical permits. SPS Pro Services pulls the required permits and schedules inspections as part of every installation.
How long does installation take?
A single-zone system is often completed in one day. Multi-zone installations with three or four indoor units typically take two to three days depending on line set length and any electrical work needed.
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 across King and Snohomish counties.
Prices reviewed July 2026
Mini Split Installation available in your city
King & Snohomish counties — local pages with city-specific pricing notes.
Need mini split installation? Get a straight answer today.
Call (206) 427-8907 to schedule a mini split assessment for your King or Snohomish County home.