Rooms with no ductwork, like additions, converted attics, garages, or ADUs
Air Conditioning · Mercer Island, WA
Mini Split Installation in Mercer Island, WA
Most Mercer Island mini split installations run $3,800 to $9,500 installed, depending on the number of zones and unit capacity. SPS Pro Services installs ductless heat pumps island-wide, from waterfront homes on West Mercer Way to condos near Town Center, usually completing single-zone jobs in one day.
Typical cost$3,800–$9,500
WarrantyWorkmanship warranty
AvailabilitySame-week visits
HoursMon–Fri 8am–6pm
Mercer Island homes sit on PSE's electric grid, and PSE offers rebates for qualifying ductless heat pump installs that can offset a meaningful chunk of the upfront cost. Because mini splits run on electricity instead of gas or resistance heat, your monthly operating cost depends heavily on the unit's efficiency rating and how well it's sized for your home. We help you pick a system that qualifies for current PSE rebates and actually lowers your utility bill instead of just shifting where the cost shows up.
Local knowledge
What's different about mini split installation in Mercer Island
A few things about working in Mercer Island shape how we quote and schedule this job.
Many Mercer Island homes built in the 1950s-70s along the west and east shorelines lack ductwork entirely, making ductless mini splits a practical retrofit for adding cooling without opening walls or ceilings.
Homes with lake or valley view additions and sunrooms often run hot in summer afternoons; a dedicated mini split zone handles that room without overworking a central system sized for the rest of the house.
PSE electric rates and seasonal demand charges mean a properly sized, high-SEER mini split can cost noticeably less to run than older electric baseboard heat common in Mercer Island's mid-century housing stock.
Symptoms we see daily
Signs you need mini split installation in Mercer Island
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 Mercer Island mini split installation visit works
1
Home assessment and load calculation
We walk your Mercer Island home, measure the rooms needing conditioning, and calculate the heating and cooling load so the unit isn't oversized or undersized.
2
System and rebate review
We review PSE rebate requirements and match you with a heat pump model and efficiency rating that qualifies, then explain expected monthly operating costs at current PSE rates.
3
Indoor and outdoor unit placement
We plan mounting locations for indoor heads and the outdoor condenser, accounting for HOA or shoreline setback considerations common on Mercer Island properties.
4
Installation and electrical work
Our techs run the line set, mount both units, and complete any electrical circuit work needed, typically finishing a single-zone install in one day.
5
Testing and rebate paperwork
We test heating and cooling operation, walk you through the thermostat and app controls, and provide documentation you'll need to submit for your PSE rebate.
Flat-rate pricing
Mini Split Installation in Mercer Island — 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 Mercer Island — FAQ
Do PSE rebates apply to mini split installs on Mercer Island?
Yes, Mercer Island is in PSE's electric service territory, and PSE periodically offers rebates for qualifying ductless heat pump installations. Rebate amounts and eligibility change, so we confirm current program details and required equipment specs before your installation and provide the paperwork you need to apply.
How much does a mini split cost to run in a Mercer Island home?
Monthly operating cost depends on the unit's efficiency rating, how many zones you run, and PSE's current electric rates. A properly sized single-zone system used for supplemental heating and cooling typically costs less per month than older electric baseboard heat found in many mid-century Mercer Island homes.
Can a mini split replace ductwork in an older Mercer Island house?
For homes without existing ductwork, common along West Mercer Way and other older sections of the island, a multi-zone mini split can heat and cool the whole house without the cost of installing new ducts. We size the system room by room during the assessment.
How fast can you install a mini split in Mercer Island?
Single-zone installs are typically completed in one day. Multi-zone systems covering several rooms or an entire home usually take two days. We schedule the visit, confirm equipment availability, and give you a firm timeline before work starts.
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 Mercer Island and across the Seattle metro.
Prices reviewed July 2026
Also in Mercer Island
Other services our crew handles on the same routes.
Need mini split installation in Mercer Island?
Call (206) 427-8907 to schedule a Mercer Island mini split assessment and get a firm installed price before we start.