Furnace is 15 years or older and repair calls are becoming frequent
Heating · Sammamish, WA
Furnace Replacement in Sammamish, WA
Furnace replacement in Sammamish typically runs $4,800 to $9,800 installed, depending on unit size and existing ductwork. SPS Pro Services has replaced furnaces across the Sammamish Plateau since 2017, sizing each system for the area's colder overnight temperatures. Most installs are scheduled within a few days and completed in a single day.
Typical cost$4,800–$9,800
WarrantyWorkmanship warranty
AvailabilitySame-week visits
HoursMon–Fri 8am–6pm
Sammamish sits several hundred feet higher than Seattle, and that elevation brings colder overnight lows, more frost, and wider day-to-night temperature swings on the Plateau. Furnaces here cycle more often through fall and winter than units in lower Seattle neighborhoods, which wears down undersized or aging systems faster. Add in the larger, newer homes common around Sammamish - many with vaulted ceilings and open floor plans - and a furnace built for a smaller house simply can't keep pace.
Local knowledge
What's different about furnace replacement in Sammamish
We run service calls in Sammamish every week — the same patterns come up again and again.
The Sammamish Plateau runs 600 to 800 feet higher than Seattle, so overnight lows drop faster and stay colder longer, meaning furnaces here run more heating cycles per week than in the valley.
Most Sammamish homes were built from the 1990s through the 2010s during the area's growth boom, often 2,500 to 4,500 square feet with multiple zones, so a furnace has to be matched to real square footage, not a generic default size.
Wooded neighborhoods around Klahanie, Trossachs, and Beaver Lake see more PSE power blips during fall windstorms, and a furnace's igniter or control board can drop out with each outage, so we check surge protection and electrical connections during replacement.
Symptoms we see daily
Signs you need furnace replacement in Sammamish
Uneven heating between rooms or a thermostat that won't hold temperature
Energy bills climbing with no change in how the home is used
Pilot light burns yellow instead of blue, or you notice odd smells when it runs
Banging, rattling, or grinding noises when the furnace starts up
No surprises
How a Sammamish furnace replacement visit works
1
In-home load calculation
We measure square footage, insulation levels, window exposure, and existing ductwork so the new furnace is sized correctly for your Sammamish home, not just a swap of what's already there.
2
System sizing and equipment selection
We recommend BTU output and efficiency ratings that account for the Plateau's colder nights, then walk through options within your budget.
3
Ductwork and venting check
Homes built before 2000 near Beaver Lake and Klahanie often have original ductwork; we inspect for leaks, undersized runs, or venting issues before installing anything new.
4
Installation day
We remove the old furnace, install the new system, connect venting and electrical, and tie in thermostat wiring, typically completed in one working day.
5
Startup, testing, and permit sign-off
We run the system through full heating cycles, check gas pressure and airflow, pull the required King County permit, and walk you through the new controls before we leave.
Flat-rate pricing
Furnace Replacement in Sammamish — 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 replacementTypical single-system job | $4,800–$6,470 |
| Mid-range furnace replacementHigher-capacity or multi-zone equipment | $6,470–$8,130 |
| Complex furnace replacementPremium 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 Replacement in Sammamish — FAQ
How much does furnace replacement cost in Sammamish?
Most Sammamish jobs land between $4,800 and $9,800 installed. The range depends on home size, whether ductwork needs modification, and the efficiency tier you choose. Larger Plateau homes with zoned systems tend to fall toward the higher end.
Why do furnaces wear out faster in Sammamish than in Seattle?
The Plateau's elevation means colder overnight temperatures and more frequent heating cycles than Seattle's lower elevation neighborhoods see. That extra runtime adds up over a furnace's lifespan, especially in homes with larger, open floor plans that demand more heat output.
Do you pull permits for furnace replacement in Sammamish?
Yes, furnace replacement in Sammamish requires a King County mechanical permit, and we handle the application and inspection scheduling as part of the job so you don't have to deal with the paperwork yourself.
How long does a furnace replacement take in Sammamish homes?
Most single-furnace installs finish in one day. Larger Sammamish homes with multiple zones or ductwork modifications can run into a second day, which we'll flag during the in-home estimate before work starts.
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 in Sammamish and across the Seattle metro.
Prices reviewed July 2026
Also in Sammamish
Other services our crew handles on the same routes.
Need furnace replacement in Sammamish?
Call (206) 427-8907 to get a firm furnace replacement quote for your Sammamish home, Monday through Friday, 8am to 6pm.