How Much Does Furnace and AC Replacement Cost in Seattle, WA? [2026 Data]

The average cost to replace a furnace and AC system in Seattle, WA, is $8,333, and most residents pay somewhere between $5,555 and $13,888. Prices depend on the type and size of the system, but other factors like your existing system type and labor costs play a role, too. Let’s review how to budget for the cost of replacing the furnace and AC in your Seattle, WA home.

Furnace and AC Replacement Cost Factors

Homeowners in Seattle, WA, can pay as low as $2,778 to replace their HVAC systems, while prices top out around $16,665. Consult your HVAC technician to get an accurate estimate for your specific project.

Type of HVAC System

There are four primary types of HVAC systems, including split systems, duct-free systems (also called mini-splits), hybrid systems, and packaged heating and air systems. The typical cost ranges for each in Seattle, WA, are listed below.

• Split systems: $4,200–$8,350

• Duct-free systems: $2,200–$16,100

• Hybrid systems: $2,800–$11,100

• Packaged heating and air systems: $11,100–$15,550

Many homes in Seattle, WA, still only have heating systems installed and aren’t equipped with AC systems. For homes with cooling, a split system is the most common setup, especially since most homes in the area already have ductwork installed.

Some residents opt for hybrid systems, which provide plenty of heating and cooling for comfort in Seattle, WA’s relatively mild summers and winters. These can also boost overall efficiency and, while more costly upfront, can save money on utility bills over time.

Unit Size

The square footage of your house is a major factor in determining what size furnace and air conditioner you need to heat or cool your space efficiently. Estimate your HVAC system costs by comparing your home to the average property size in Seattle, WA, which is just over 1,800 square feet. 

There are many other factors that influence your system’s ideal capacity, though, so always have a local HVAC company help determine what size you need exactly by doing a load calculation.

Unit Brand

An HVAC system costs an average of $5,300 for the equipment alone, but the brand you buy can change this number. For example, brands like Amana or Coleman more often come in at the lower end of the spectrum, closer to $3,300, while brands like Trane and York can push costs up to $6,700 or more.

HVAC Pro Costs

When you hire an HVAC company in Seattle, WA, an average of between 40% and 60% of your total will go toward labor, which means between $3,300 and $5,000. Labor charges in the area are much higher than you’d pay in most other cities, as the local cost of living, which affects labor fees, is 43% higher than the national average.

Your HVAC company will also need to pull permits for the work, which are required by the building department in Seattle, WA. The city charges fees for heating and cooling units separately, but these add up to an average of $95.90 for the standard split system.

Does Replacing Your AC and Furnace Increase Home Value?

Replacing your AC and furnace will improve your home value, as these are core mechanical components, and buyers are almost always willing to pay more for a home with a lower risk of a breakdown. On average, the project provides a return on investment (ROI) of 30%.

You can maximize your ROI by optimizing for efficiency. Some homeowners opt for hybrid systems to reduce their use of fossil fuels and extend their furnace’s lifespan, and these come with the added benefit of reducing utility bills over time, especially in Seattle, WA’s relatively mild climate.

How Angi Gets Its Local Cost Data 

To help homeowners plan their next project, Angi provides readers with carefully researched cost data and upholds strict editorial standards. We start with national average project costs, which we collect by analyzing competitor information, retailer material costs, and input from professional contractors. We then apply local price index data to calculate location-specific estimates that reflect what homeowners typically pay in their local area. To do that, we use data from the U.S. Bureau of Economic Analysis (BEA), including its Regional Price Parities (RPPs), which measure price differences across cities. This helps us account for differences in labor, materials, and overall cost of living, so estimates in higher- or lower-cost areas better reflect real-world local pricing.

Every estimate undergoes a thorough editorial review to verify accuracy, consistency, and alignment with observed market conditions.

Want to help us improve our cost data? Send us a recent project quote to [email protected]. Quotes and personal information will not be shared publicly.