AC Installation in Seattle
Get fast, fair pricing from licensed local pros. Typical Seattle cost: $4.9k – $9.9k+ installed.
- Central AC (replace)
- $4.9k – $9.9k+
- New central AC + ducts
- $7.4k – $16k+
- Ductless mini-split
- $3.7k – $9.9k
- Permit & inspection
- $90 – $500
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AC installation cost by system.
Installed pricing for Seattle, adjusted for local labor. Higher SEER2 tiers, larger tonnage, and new ductwork add to the base.
Seattle homeowners considering AC installation face a climate where cooling demand is low but summer heat waves are becoming more common. With a median home built in 1973, many homes lack ductwork or have aging systems. Typical installed costs range from $4,900–$9,900 for a like-for-like central AC, $7,400–$16,000+ for new central AC with ductwork, $3,700–$9,900 for ductless mini-splits, and $6,200–$14,800+ for heat pumps. Washington's energy code requires a Manual J load calculation and a mechanical permit, and recent code strongly favors heat pumps for new construction. The federal 25C tax credit offers up to $2,000 for qualifying heat pumps and up to $600 for high-efficiency central AC, making heat pumps a recommended choice for many Seattle homes.
- Central AC, like-for-likeExisting ducts in good shape$4,900 – $9,900+
- New central AC + ductworkFirst-time or full duct replacement$7,400 – $16,000+
- Ductless mini-splitSingle or multi-zone, no ducts$3,700 – $9,900
- Heat pump (cooling + heating)Qualifies for federal & local rebates$6,200 – $15,000+
- Permit & inspectionRequired in most jurisdictions$90 – $500
* High-efficiency systems cost more upfront but may qualify for federal tax credits and utility rebates.
Pricing reviewed · Local data from U.S. Census ACS
HVAC systems in Seattle
U.S. Census ACS- Households
- 293,841
- Homeowners
- 153,477
- 41% own
- Median home value
- $879,900
- Median income
- $116,068
- Median home built
- 1973
- Housing units
- 372,436
With a median home built in 1973, many Seattle AC and furnace systems are at or past their 12–15 year lifespan — a common reason replacements spike here.
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What’s different about Seattle.
Generic cost pages skip the things that actually decide your price and which system fits here — local code, climate, and the money you can claim back.
Recommended unit for Seattle
Given Washington’s mild (marine, west of cascades) climate and electric heating, high-seer2 heat pump is the sensible default for most Seattle homes. The cooling season is short, so the budget is better spent on heating efficiency than on ultra-high SEER2. A pro can confirm the right size and system for your home with a load calculation.
Sources: PSE Home Heating Rebates · WA Dept. of Commerce HEAR Program · 2021 Washington State Energy Code - Residential (WAC 51-11R)
What Seattle code requires
Installing or replacing an HVAC system in Seattle follows Washington rules under the state mechanical code. Here’s what applies statewide:
- PermitRequired
Mechanical permit pulled by your licensed HVAC contractor; covers equipment, refrigerant, and the electrical disconnect.
- SEER2 minimum13.4 SEER2 (North)
Federal North-region minimum for new split-system AC. Higher tiers cut bills and unlock rebates.
- Load calculationRequired (Manual J)
Sizing by load calc — not rule of thumb — prevents an oversized unit that short-cycles and never dehumidifies.
- RefrigerantR-454B / R-32 (R-410A phased down 2025+)
- Good to know—
The Washington State Energy Code (WSEC-R) requires ACCA Manual J load calcs and Manual S equipment sizing at permit, and recent code strongly favors/effectively requires heat pumps for space heating in new residential construction.
Sources: PSE Home Heating Rebates · WA Dept. of Commerce HEAR Program · 2021 Washington State Energy Code - Residential (WAC 51-11R)
Not sure which rules and rebates apply to your home?
A licensed Seattle pro will walk you through code, the right unit, and what you can claim back — in one quick call.
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Money back in Seattle
Washington heating is mostly electric, which shapes the money back:
- State$1,500 (up to $2,400 income-qualified Efficiency Boost)Puget Sound Energy - Electric resistance to air-source heat pump conversion rebate →
State or utility program — verify eligibility before you buy.
- StateUp to $8,000 for heat pumps (income-qualified)Washington Dept. of Commerce - Home Electrification and Appliance Rebates (HEAR) →
State or utility program — verify eligibility before you buy.
- Federal30% of cost, up to $2,000Federal 25C tax credit — heat pump →
For a qualifying ENERGY STAR heat pump meeting the CEE efficiency tier. Claimed on your federal return.
The federal 25C tax credit (30%, up to $2,000 for a qualifying heat pump and up to $600 for a high-efficiency central AC) applies in every state, including Washington.
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- 1
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- 2
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- 3
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AC Installation in Seattle, explained.
What drives AC installation costs in Seattle?
Seattle's mild climate means cooling loads are low, but older homes (median built 1973) often need ductwork modifications or new ducts, which adds $2,500–$6,000+ to a central AC install. Ductless mini-splits avoid ductwork costs but require multiple heads for zoned cooling. Heat pumps cost more upfront than central AC ($6,200–$14,800+) but qualify for federal tax credits and provide efficient heating in Seattle's mild winters. Permit fees and Manual J load calculations add $200–$500. Labor rates reflect Seattle's high cost of living, and system efficiency (SEER2) affects equipment price.
Common AC installation issues in Seattle
Undersized or missing ductwork
Many Seattle homes built before 1970 lack central ducts or have undersized ducts designed only for heating, requiring new ductwork or a ductless system.
Permit and code compliance
Washington requires a mechanical permit and a Manual J load calculation for AC installation; failing to pull a permit can lead to fines and issues when selling the home.
Refrigerant transition
R-410A is being phased down after 2025; new systems use R-454B or R-32, which may require different service equipment and affect future servicing costs.
What to expect during AC installation in Seattle
A licensed contractor will first perform a Manual J load calculation to size the system correctly. For central AC, installation typically takes 1–3 days, including running refrigerant lines, installing the outdoor unit, and connecting to existing ductwork or new ducts. Ductless mini-split installations take 1–2 days per indoor head. The contractor will pull a mechanical permit with the city and schedule an inspection after completion. Expect the job to include proper disposal of old equipment and a startup test.
AC Installation FAQs — Seattle
Yes, Washington state requires a mechanical permit for AC installation. Your contractor should pull the permit and schedule the required inspection.
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