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HVAC Replacement Cost Calculator — Seattle

HVAC replacement in Seattle, Washington costs significantly higher than the national average. Home size, system type, and ductwork condition are the biggest cost factors. Get your estimate below.

Low estimate$5,800
Average$11,000
High estimate$23,400

Home square footage

Home square footage 1800

Quality Tier

Standard materials, solid craftsmanship

Scope of Work

Labor

Labor portion of total cost 40%

HVAC Replacement Cost in Seattle: 2026 Guide

Use the calculator above to get a quick estimate. The guide below explains what drives hvac replacement costs in Seattle and what to expect from contractors in Seattle.

Typical HVAC Replacement Costs in Seattle

Project ScopeLowHigh
AC only — small home (under 1,200 sqft)$2,000$3,800
Full system — average home (1,200–2,000 sqft)$5,800$9,600
Full system — large home (2,000–3,500 sqft)$9,600$11,000
Premium system or full ductwork replacement$11,000$23,400

What Affects HVAC Replacement Costs in Seattle?

Labor rates: Contractors in Seattle charge $58–$117/hour for hvac replacement work — significantly higher than the national average.

Material costs: Material prices in the West region are significantly higher than national average due to local supply, transportation costs, and market demand.

Project complexity: Site conditions, permitting requirements, and non-standard layouts can add 15–30% to total project cost.

Frequently Asked Questions

How much does HVAC replacement cost in Seattle?
HVAC replacement in Seattle typically costs $5,800–$23,400. Most homeowners pay around $11,000 for a complete AC + furnace system in a standard home. Heat pump systems run $5,800–$23,400 installed.
How often does HVAC need to be replaced in Seattle?
HVAC systems typically last 15–25 years. Central AC units last 15–20 years, furnaces 20–30 years, and heat pumps 15–20 years. In Seattle, climate stress (hot summers or cold winters) can shorten lifespan.
What size HVAC do I need in Seattle?
Most homes need approximately 1 ton of AC capacity per 400–600 sqft. Your 1,800 sqft home likely needs a 3-ton unit. A load calculation (Manual J) from a licensed HVAC contractor in Seattle gives the exact sizing.
Is it better to repair or replace HVAC in Seattle?
If repair costs exceed 50% of replacement cost, or the unit is over 10 years old, replacement is usually better value. New systems use 30–50% less energy, which can save $5,800–$11,000 over 10 years in Seattle.

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Estimated cost in Seattle

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Range: $0 – $0
Materials$0
Labor$0
City multiplier1.30x

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