Furnace is 15 years or older and needs frequent repairs
Heating · Greater Seattle
Furnace Installation Services — Greater Seattle
Most furnace installations in Greater Seattle run $4,800 to $9,800 depending on furnace size, ductwork condition, and home layout. SPS Pro Services installs gas and electric furnaces across King and Snohomish counties, sizing each system to your home's square footage and insulation levels so you get consistent heat through wet Pacific Northwest winters without overpaying on energy bills.
Licensed, bonded & insured in WashingtonMon–Fri 8am–6pm · 24/7 emergencies
A full furnace installation includes removal of your old unit, load calculations based on square footage and duct layout, new equipment setup, venting and gas line or electrical connections, and startup testing. Homeowners across King and Snohomish counties typically need this when a furnace is 15 years or older, repairs keep piling up, energy bills climb despite similar usage, or the system was never sized correctly for the home. SPS Pro Services installs both gas and electric furnaces to match local utility setups.
Symptoms we see daily
Signs you need furnace installation
Uneven heating between rooms or floors
Energy bills rising without a change in usage
Furnace short-cycles, turning on and off repeatedly
Unusual noises, a burning smell, or a yellow pilot flame
No surprises
How a furnace installation visit works
1
Home evaluation and load calculation
We measure square footage, insulation levels, window count, and existing ductwork to determine the correct furnace size for your home.
2
Equipment selection
We walk through gas and electric furnace options, efficiency ratings, and how each fits your current fuel source and budget.
3
Removal and installation
The old furnace is disconnected and removed, and the new unit is set, leveled, and connected to existing or modified ductwork.
4
Venting and utility hookup
We connect gas lines, electrical wiring, or venting as needed and confirm the work meets local mechanical code.
5
Testing and walkthrough
We run the system through a full heating cycle, check airflow at registers, and explain thermostat settings and maintenance before we leave.
Why quotes range from $4,800 to $9,800
These factors decide where your job lands in the range — and we walk you through each one on the written quote.
- Furnace BTU size needed for your home's square footage and insulation levels
- Condition of existing ductwork, since many older homes in King and Snohomish counties need repairs or modifications
- Whether the job involves a fuel switch, such as adding a new gas line or upgrading an electrical panel
- Attic or crawlspace access difficulty, which varies widely in older Puget Sound-area homes
Flat-rate pricing
Furnace Installation — what it costs
Conservative ranges for the Seattle metro. Your written quote is exact before work begins.
| Job | Typical price |
|---|---|
| In-home estimateExact flat quote for your home | Free |
| Standard furnace installationTypical single-system job | $4,800–$6,470 |
| Mid-range furnace installationHigher-capacity or multi-zone equipment | $6,470–$8,130 |
| Complex furnace installationPremium equipment or difficult access | $8,130–$9,800 |
Prices reviewed by Sergei Petrov · July 2026. Parts availability can shift ranges — the quote you sign is final.
24/7 Emergency Line
Emergency dispatchNo heat at 11pm? We pick up.
Office hours are Mon–Fri, but the emergency line never closes. Call any hour and we dispatch a licensed tech across Greater Seattle.
Straight answers
Furnace Installation questions we hear most
How long does furnace installation take?
Most installations take one to two days depending on ductwork changes, permit needs, and whether you're switching fuel types. A straightforward replacement using existing gas lines and ducts often finishes in a single day, while jobs requiring new ductwork or electrical work typically take a full two days.
Do I need a permit for furnace installation in King or Snohomish county?
Yes, both counties require mechanical permits for furnace replacement, and individual cities may have their own inspection scheduling. SPS Pro Services pulls the necessary permits and schedules inspections as part of every installation so the work is documented and code-compliant.
Should I switch from oil or electric heat to gas?
It depends on whether PSE gas service reaches your home and how your ductwork is set up. Many older homes in King and Snohomish counties still run on oil furnaces or electric heat, and converting can lower operating costs, though it requires a new gas line and permit approval.
What size furnace does my home need?
Furnace size depends on square footage, ceiling height, insulation, and window count, not just the size of your old unit. SPS Pro Services performs a load calculation during the estimate so the recommended BTU output matches your home, since an oversized or undersized furnace runs less efficiently and wears out faster.
Founder & Lead HVAC Technician, SPS Pro Services
EPA Section 608 UniversalNATE Core Certified14+ years in the trade
Reviews the pricing and service guidance on this page against SPS Pro Services's actual job records across King and Snohomish counties.
Prices reviewed July 2026
Need furnace installation? Get a straight answer today.
Call (206) 427-8907 to schedule a furnace installation estimate, or select your city below for local scheduling.