How much does it cost to replace an AC system in Seattle, WA?
Full AC system replacement in Seattle, WA typically runs $6,500–$12,000 installed for a standard-efficiency system, including the outdoor unit, indoor coil, and labor. High-efficiency systems run $10,000–$16,000 but can cut cooling bills 20–40%. Quotes vary mostly on sizing and ductwork condition — get the load calculation, not just a tonnage guess.
What you can check yourself
- Ask each bidder for their load calculation (Manual J) — a quote without one is a guess.
- Compare like-for-like efficiency (SEER2 rating) across quotes.
- Ask about utility rebates and federal tax credits in the quote — good installers itemize them.
Typical cost
Typical installed range in Seattle, WA: $6,500–$12,000 standard; $10,000–$16,000 high-efficiency. Ductwork replacement, if needed, adds $2,000–$5,000.
When to call a pro
This is a get-three-quotes job. The cheapest bid without a load calculation usually becomes the most expensive system you own.
HVAC pros in Seattle, WA
- Seattle Steam Co · Puget Sound Plaza, 1325 4th Ave #1440, Seattle, WA · +12066236366
- Warren Company · 500 Union St Ste 900, Seattle, WA · (206) 749-9484
- US HVAC Home Service Seattle · 300 Pine St Ste 100, Seattle, WA · (253) 793-1154
- MM Comfort Systems · 800 5th Ave 101 463, Seattle, WA · 2065429100
- Dorse and Company · 5000 1st Ave S, Seattle, WA · +12062842610
- Mighty Energy Solutions · 2910 1st Ave S Ste 201, Seattle, WA · +12068801558
- United Systems Mechanical · 1400 Airport Way S Ste 202, Seattle, WA · +12069336036
- Local Hvac Expert Seattle · 3250 Airport Way S, Seattle, WA · +12065651003
Get free quotes from Seattle, WA pros →
Data by Servik — verified local pros from official license records and public sources. Cost figures are typical ranges, not quotes; a pro's written estimate is the real number.