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HVAC · Seattle, WA · 2026 cost guide
How much does AC replacement cost in Seattle, WA?
In the Seattle-Tacoma-Bellevue, WA area, replacing a central air conditioner runs about $6,600 to $14,400 installed in 2026, about 20% above the national range. Contractor labor here is indexed at 1.20 against the U.S. average, and that is what moves the numbers; equipment and materials cost about the same everywhere.
- Central AC
- $6,600–$14,400condenser and coil, installed
- Heat pump
- $8,400–$19,200heats and cools, installed
- AC + furnace
- $10,800–$24,000full split system
- Ductless mini-split
- $4,800–$16,800one to four zones
AC replacement in Seattle is rarely a like-for-like swap, because most homes never had air conditioning until the June 2021 heat dome pushed Sea-Tac to 108 F. With only 250 cooling degree days a year in marine climate zone 4C, a cooling project here almost always means a heat pump or ductless mini-split that also replaces a gas furnace or electric resistance heat. Expect $6,600 to $14,400 installed for a typical system, with labor about 20 percent above the national average driving much of that.
What's different in Seattle
Sizing is where local knowledge pays. A contractor who sizes for a Spokane or Sacramento summer will oversize a Seattle house, where the hottest afternoons in most summers sit in the 80s and nights cool into the 50s; an oversized unit short-cycles and never runs long enough to feel comfortable. A Manual J for a Seattle bungalow often lands at a ton and a half to two and a half tons. The heating side matters more, since 4,600 heating degree days at mild design temperatures in the 20s are exactly what a standard heat pump handles without a cold-climate premium. The regional minimum for new central AC in Washington is 13.4 SEER2.
System choice is easier than in most metros. Heat pumps are the default replacement here: Seattle City Light has offered rebates, Puget Sound Energy has run its own programs, and hydro power at about $0.12 per kWh makes electric heat cheap to run, so a gas furnace plus a separate AC is the more expensive path to own. Homes with electric baseboards and no ducts, common in 1960s to 1980s houses and condos, go ductless with two to four indoor heads. Homes with a furnace and ducts get a ducted heat pump or a dual-fuel setup. Ask each installer which utility and state programs are open now; the installer files the paperwork.
Permits and site details are local. Seattle SDCI in the city, King County in unincorporated areas, and Bellevue, Kirkland, Redmond, and Tacoma each permit the change-out separately, and the electrical circuit must be done by a Washington L&I licensed contractor, sometimes on its own permit. Budget for a possible panel upgrade in an older house. Outdoors, set the unit on a pad or bracket clear of the roof drip line, since Seattle's rain and Douglas fir needles fill a coil fast, and keep it out of the moss-shaded north side where it never dries. Homes near Puget Sound or Elliott Bay benefit from coated coils against salt air.
AC Replacement prices in Seattle vs. the national guide
These are the ranges from our national AC replacement cost guide next to the same items scaled by the Seattle, WA labor index of 1.20. Rows marked fixed are materials only and do not move with local labor.
| Item | National range | Seattle, WA |
|---|---|---|
| Central AC | $5,500–$12,000 | $6,600–$14,400 |
| Heat pump | $7,000–$16,000 | $8,400–$19,200 |
| AC + furnace | $9,000–$20,000 | $10,800–$24,000 |
| Ductless mini-split | $4,000–$14,000 | $4,800–$16,800 |
Local tip: If your furnace or baseboards are due anyway, price a heat pump now rather than after the next heat wave; Seattle installers had months-long backlogs after June 2021, and the rebates are easiest to line up in the fall.
Seattle at a glance
- Climate zone
- 4Cmarine
- Labor index
- 1.20vs. U.S. average 1.00
- Cooling degree days
- 250per year, base 65 °F
- Heating degree days
- 4,600per year, base 65 °F
- Min. AC efficiency
- 13.4 SEER2federal minimum for this region
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Do I really need air conditioning in Seattle?
Most summers, no; a typical Seattle July has highs in the 70s and low 80s and the nights cool off. What changed in June 2021 was the ceiling: 108 F at Sea-Tac in houses built with no cooling at all. The cheapest answer is a heat pump that replaces an aging furnace or electric baseboards and adds cooling for those rare weeks, so the AC comes along with a better heating system.
Is a heat pump better than a new furnace and AC in Seattle?
Almost always. Seattle City Light and PSE power near $0.12 per kWh is among the cheapest of the 25 largest metros, the 4C marine climate rarely drops below the 20s, and a standard heat pump handles 4,600 heating degree days without needing cold-climate hardware. Rebates from Seattle City Light have targeted exactly this swap. A gas furnace plus separate AC costs more to buy and more to own here.
What size heat pump does a Seattle home need?
Smaller than a Spokane installer would guess. With 250 cooling degree days and design temperatures in the 20s, a 1,500 to 2,000 square foot Seattle or Tacoma house usually lands between two and three tons on a proper Manual J, and a well-insulated newer home on the Eastside may need less. Oversizing is the common mistake; it short-cycles in cooling and defrosts poorly in a damp winter.
How do HVAC permits work in Seattle versus the suburbs?
Each jurisdiction permits separately. Seattle SDCI handles the city, King County handles unincorporated areas, and Bellevue, Kirkland, Redmond, Renton, and Tacoma each run their own. Electrical work must be done by a Washington L&I licensed electrical contractor and may need its own permit through L&I or the city. Ask the installer which offices your address touches, and never accept a proposal that skips the permit.
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