How Much Does a New Furnace Cost in Seattle? [2025 Data]

In Seattle, winter brings chilly days, with temperatures ranging from 39 to 52 degrees Fahrenheit. A new furnace will keep out the chill, and homeowners can expect to spend an average of $4,683 for the cost of a new furnace. The project total may range from $2,762 to $6,683, depending on what type of furnace you install and how efficient it is, plus how much space you need to heat.

Furnace Cost Factors

The total cost to install a new furnace in Seattle depends on several factors. Here’s what you can expect to budget based on the furnace and home size, furnace type, and other major cost influences.

Size

The furnace capacity is measured by British thermal units, or BTUs, which show how much heat is needed to raise the temperature of 1 pound of water by 1 degree Fahrenheit. You need about 30 to 60 BTUs for every square foot. So, for the median home size in Seattle of 1,890 square feet, you’d need about 56,700 to 113,400 BTUs. 

An HVAC pro in Seattle, WA will be able to best determine what furnace size you need for your home, but here are the average costs by home size and furnace BTUs:

Type of Furnace

The type of furnace you own makes a huge difference in the installation cost, and each type comes with its own pros and cons. In Seattle, natural gas is the most common, while electric furnaces are also popular. Because this is a densely populated metropolitan area, options like propane, oil, and wood are less common.

Efficiency

The more efficient your furnace is at converting fuel to heat, the less energy it wastes and the lower your energy bills will be. Higher efficiency units may cost more upfront, but they offer better cost savings over time and may even come with longer lifespans. 

Furnace efficiency is measured by the fuel utilization efficiency (AFUE) rating. Here’s how much you can expect to spend based on fuel efficiency.

Ductwork

Most furnaces require ductwork to push the heated air through your home, although some types, like wood furnaces, don’t need ducts. If you do need to install or replace ducts for your home, expect to spend about $620 to $2,110.

Furnace Pro Costs 

An HVAC pro near you will include the costs for labor, permits, and inspections in their project quote. Labor will make up about 20% to 30% of the total cost, so for a typical furnace installation in Seattle that costs around $4,683, labor will account for about $940 to $1,410 of the project total.

In addition, Seattle requires a furnace or mechanical permit and two inspections for furnace installations. The permit for a furnace costs about $56.65 per unit, but the permit cost will depend on your specific project.

Does a New Furnace Increase Home Value?

Installing a new furnace in Seattle can increase your home’s value by up to 10% and can offer an ROI of up to 60%. Because Seattle can be drizzly, gray, and chilly for much of the year, residents appreciate a reliable, efficient furnace to keep their homes warm. Consider investing in a higher efficiency furnace for the biggest ROI and best energy cost savings.

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

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