Furnace Installation & Replacement in Seattle
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A new furnace is one of the biggest upgrades you can make to your home's comfort. Greenwood Heating and Home Services installs and replaces gas and electric furnaces for homeowners across Seattle and King and Snohomish counties. We size every system to your home, install it to code, and stand behind it with some of the strongest warranties in the industry.
How a Furnace Heats Your Home
A furnace heats air and moves it through your ductwork. A gas furnace burns natural gas to warm a metal heat exchanger, and a blower pushes air across it and out through your vents. An electric furnace does the same job with heating elements instead of a flame. Cooler air returns to the furnace, and the cycle repeats until your home reaches the temperature on your thermostat.
That's the main difference between a furnace and a boiler, which heats water for radiators, or a heat pump, which moves heat instead of creating it. Many Seattle homes pair a furnace with a heat pump in a dual-fuel system, which we cover below.
Our Furnace Services
New Furnace Installation
Building an addition or adding central heat? We install high-efficiency gas furnaces and electric furnaces, designed around your home's layout, ductwork, and fuel source, and we handle the permits.
Oil-to-Gas Conversions
Still heating with oil? We'll replace your oil furnace with a high-efficiency gas or electric furnace and remove the old equipment. A conversion can lower your heating costs and maintenance.
Furnace Replacement
When your furnace reaches the end of its service life, we remove and haul away the old unit, install a properly sized replacement, and test the full system before we leave. Upgrading from an older furnace to a high-efficiency model can lower your gas bills for years to come.
Furnace Repair & Maintenance
Not ready to replace? We also offer furnace repair and annual maintenance for all major brands.
Choosing the Right Furnace
Efficiency (AFUE)
AFUE measures how much of the fuel you buy becomes heat in your home. An 80% AFUE furnace turns 80 cents of every gas dollar into heat, while a 96% AFUE condensing furnace turns 96 cents into heat by capturing extra heat from its exhaust. In Seattle's long heating season, a high-efficiency furnace usually pays back the difference over time.
Single-Stage, Two-Stage, or Modulating
A single-stage furnace runs at full power every time. A two-stage furnace runs at a lower setting most of the time and ramps up on cold days, which means steadier temperatures and quieter operation. A modulating furnace adjusts its output in small steps for the most even comfort.
Variable-Speed Blowers
A variable-speed blower moves air gently and continuously, which improves comfort, reduces noise, and helps your air filter and air conditioner work better.
Right-Sizing
Bigger is not better. A furnace that's too large will short cycle, wear out sooner, and leave hot and cold spots. We calculate your home's heating needs before recommending a size.
Dual-Fuel Systems
Pairing a high-efficiency furnace with a heat pump lets your home use efficient electric heat most of the year and switch to gas on the coldest days.
Signs It May Be Time for a New Furnace
- Age: Your furnace is 15 to 20 years old or more, and efficiency has dropped.
- Frequent repairs: You've called for service more than once in the past season, and the bills are adding up.
- Rising gas bills: An aging furnace works harder to deliver the same comfort.
- Uneven heating: Some rooms are always too warm while others stay cold.
- A cracked heat exchanger: This can allow combustion gases to leak and usually means replacement rather than repair.
- Noise and dust: Loud operation, or more dust than usual, can be signs of a worn-out blower or system.
Our technicians will give you an honest assessment of both repair and replacement, so you can make the right choice for your home and budget.
Our Furnace Installation Process
- In-Home Assessment: We look at your home, ductwork, venting, and comfort concerns, and calculate the right size.
- Clear Options: We walk you through a few options at different price points, with upfront pricing.
- Permits: We handle the permits and inspections, so you don't have to.
- Removal & Installation: We remove and haul away your old furnace, then install and connect the new one.
- Testing & Walkthrough: We test the system, check for gas leaks and carbon monoxide, and show you how to care for it.
Frequently Asked Questions About Furnaces in Seattle
How much does a new furnace cost in Seattle?
The price depends on the furnace's size and efficiency, your existing ductwork and venting, and how easy the installation space is to reach. A standard 80% furnace costs less than a high-efficiency, variable-speed model. Contact us for a free, upfront estimate.
How long does a furnace last?
Most gas furnaces last about 15 to 20 years with regular maintenance. Annual tune-ups help you get the most out of yours.
How long does furnace installation take?
A straightforward replacement usually takes a day. Jobs that need new venting, ductwork changes, or a fuel conversion can take longer.
Do I need a permit to replace a furnace in Seattle?
Yes. Replacing a furnace generally requires a mechanical permit, and gas work requires inspection. Our team handles the permitting for you.
Is a high-efficiency furnace worth it in Seattle?
For many homes, yes. Seattle's heating season is long, so the savings from a 96% AFUE furnace add up over the years, and utility rebates of up to $6,000, depending on your location, can lower the upfront cost. We'll help you compare the cost against the long-term savings.
Do you install electric furnaces?
Yes. We install electric furnaces as well as gas furnaces, and we can convert homes from oil heat to gas or electric.
Should I get a furnace or a heat pump?
It depends on your home, your ductwork, and your goals. A heat pump heats and cools efficiently, while a furnace delivers strong heat on the coldest days. Many homeowners choose a dual-fuel system to get both. Our comfort advisors can walk you through the options.
Keep Your New Furnace Running Longer
A furnace that's looked after every year can outlast one that's ignored. Our Club Membership makes it simple. Membership comes in four tiers, and benefits depend on the tier you choose:
- Priority Service: Depending on your tier, members get priority, same-day, or 24-hour service during extreme weather and emergencies.
- Extended Repair Warranties: Repairs we complete while you are a member are covered by a parts warranty, with the length set by your tier.
- Member Savings: Save on repairs and diagnostic fees, with discounts that vary by tier.
- Never Miss a Tune-Up: We'll send a yearly reminder by text, email or phone, whichever you prefer.
- Savings on New Equipment: Members save 5% on new equipment, including a new furnace. (This discount cannot be combined with the yearly accrual).
Furnace Specials, Rebates & Financing in Seattle
Save $500 on a new furnace through December 31, 2026. See our seasonal specials for details.
You may also qualify for up to $6,000 in utility rebates on a high-efficiency system, depending on where you live. Our team will help you find the rebates available for your home.
A new furnace is a big investment. Through our partnership with GreenSky, you can spread the cost over time. The application takes just minutes and uses a soft credit check, so applying won't affect your credit score.
Why Seattle Homeowners Choose Greenwood
- Over a Century in Seattle: We've been caring for local homes since 1918.
- Locally Owned & Operated: Our decisions are made here, guided by our Core Values and backed by some of the strongest warranties in the industry.
- Upfront Pricing: No surprise bills. You'll know the price before any work begins.
Ready for a new furnace in Seattle? Schedule your free estimate today or call 206-207-4734.
Ready to Get Started?
Whether it's an emergency repair or routine maintenance, we're here to help. Book online or give us a call — your comfort is our priority.
