No central cooling in a home that gets uncomfortably warm during July and August heat waves
Air Conditioning · Greater Seattle
AC Installation Services in Greater Seattle
Most AC installations in Greater Seattle run $5,500 to $12,500 depending on system type and home size. SPS Pro Services installs central air and ductless mini-split systems across King and Snohomish counties, sized correctly for our marine climate and older housing stock.
Licensed, bonded & insured in WashingtonMon–Fri 8am–6pm · 24/7 emergencies
AC installation covers everything from equipment selection to permitting, electrical hookup, and startup testing. Homeowners typically need this service when adding cooling to a home that never had it, replacing a failing 15-plus-year-old system, or switching from window units to whole-home comfort. Many Western Washington houses built before 2000 lack ductwork sized for AC, so we evaluate your existing setup before quoting a number.
Symptoms we see daily
Signs you need ac installation
Window units or portable ACs that can't keep up with upper floors
Planning a home addition, attic conversion, or ADU that needs its own cooling source
Existing ductwork designed only for a gas furnace, with no AC coil ever installed
Frequent hot spots on the second floor of a two-story home
No surprises
How a ac installation visit works
1
Home evaluation
We inspect existing ductwork, electrical panel capacity, and attic or crawlspace access to determine whether you need central AC, a ductless system, or a hybrid setup.
2
System sizing and quote
We calculate proper tonnage based on square footage, window exposure, and insulation, then provide a written estimate with equipment options.
3
Permitting
We pull required mechanical and electrical permits through your local jurisdiction before any installation work begins.
4
Installation
Our techs install the outdoor condenser, indoor coil or air handler, refrigerant lines, and any new electrical circuits, then connect to existing or modified ductwork.
5
Startup and walkthrough
We test refrigerant charge, airflow, and thermostat operation, then walk you through system controls and maintenance basics before closing out the permit inspection.
Why quotes range from $5,500 to $12,500
These factors decide where your job lands in the range — and we walk you through each one on the written quote.
- Whether your home already has ductwork sized for AC or needs new duct runs added
- Central AC versus ductless mini-split, since multi-zone ductless systems price per head
- Electrical panel capacity, since older homes often need a subpanel or circuit upgrade
- Attic or crawlspace access difficulty, which affects labor time on older King and Snohomish County homes
Flat-rate pricing
AC 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 ac installationTypical single-system job | $5,500–$7,830 |
| Mid-range ac installationHigher-capacity or multi-zone equipment | $7,830–$10,170 |
| Complex ac installationPremium equipment or difficult access | $10,170–$12,500 |
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
AC Installation questions we hear most
Do I really need AC in the Seattle area?
Our marine climate keeps most days mild, but summer heat waves have pushed temperatures into the 90s in recent years, and homes built for our historically cool weather often trap heat upstairs. Many homeowners add AC for a handful of hot weeks plus better air quality during wildfire smoke events.
Is ductless or central AC better for my home?
If your house already has ducts in good condition, central AC usually integrates cleanly with your existing furnace. Homes with no ductwork, or additions and older houses with baseboard heat, often do better with a ductless mini-split, which avoids cutting into walls and ceilings for new ducts.
How long does installation take?
A straightforward central AC add-on to existing ductwork typically takes one to two days. Ductless multi-zone systems or jobs requiring new ductwork or electrical panel upgrades can take three to five days depending on scope.
Does SPS Pro Services handle the permits?
Yes. We pull mechanical and, when needed, electrical permits through the applicable city or county before installation starts, and we coordinate the final inspection so the system is documented and code-compliant.
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
Need ac installation? Get a straight answer today.
Call (206) 427-8907 Monday through Friday, 8am to 6pm, to schedule an AC installation estimate anywhere in King or Snohomish County.