Locally-owned since 1977 • Licensed, bonded and insured in Washington (WA Contractor Reg. #HOMECCA785BD) • WA Electrical Contractor Lic. #HOMECCA782DC • NATE-certified technicians • Carrier Factory Authorized Dealer • Mitsubishi Electric Diamond Dealer • Lennox Premier Dealer
Furnace replacement in Duvall, WA
Home Comfort Alliance replaces natural gas and electric furnaces in Duvall, with crews and comfort advisors coming out from our Redmond branch. We start with a free in-home estimate: a heat-loss measurement, a look at the ductwork and flue, and a written page of options that shows each model, its price, the rebates it qualifies for and monthly financing.
Duvall sits on SR 203 above the Snoqualmie Valley floor, between Monroe and Carnation, and a lot of its neighborhoods went up in the 1980s and 1990s as families moved out from the Eastside. Homes from that growth period are now roughly 25 to 45 years old, well past the working life of an original furnace. Puget Sound Energy supplies both electricity and natural gas here, which opens up PSE programs that most of the region can’t use.
The short version: replace rather than repair when the furnace is 15 or more years old, needs a major part, or can’t keep the upstairs comfortable. Before you pick a new gas furnace, look at the PSE Duvall Heat Pump Program below; for many gas homes in town it changes the math.
What furnace replacement costs
Numbers below are a regional estimate from Seattle-area data, since no Duvall-only survey exists. Our written quote replaces them.
| Item | Typical cost (Seattle area) |
|---|---|
| New furnace, average installed | About $4,683 |
| Most installs | $2,762 to $6,683 |
| Natural gas furnace | $3,800 to $10,000 |
| Electric furnace | $2,000 to $7,000 |
Source: Angi, Seattle new furnace costs, updated July 2026. Regional estimate, not a quote.
On Duvall jobs, the biggest swings come from where the furnace sits (tight crawlspace versus open garage), whether the venting changes from metal flue to PVC for a condensing furnace, and whether the ductwork needs sealing or a bigger return. We list each as its own line.
The PSE Duvall Heat Pump Program
PSE runs a program just for this area. As of September 2026 it offers up to $8,000 toward replacing gas heat with a heat pump (PSE Duvall Heat Pump Program). The main conditions PSE lists:
- PSE natural gas, single-family customers in eligible Duvall-area neighborhoods in ZIP codes 98019 and 98014.
- The gas furnace, wall heater or boiler is replaced by an AHRI-certified heat pump, and the gas equipment is removed or decommissioned.
- Electric resistance backup is disabled.
- The installer is a PSE Trade Ally or registered installer, and the application is filed within 30 days.
Home Comfort Alliance is a PSE Trade Ally approved contractor for HVAC systems, so we can install to program rules and file the paperwork with you. If you want to keep gas, PSE’s hybrid heat pump rebate of $1,500, with up to $2,400 more through Efficiency Boost, helps pay for adding a heat pump to a new or existing furnace (PSE hybrid heat pump rebate). The federal 25C credit ended December 31, 2025, so it is not in our numbers.
Furnace, heat pump or both?
| Choice | Suits a Duvall home that… | Keep in mind |
|---|---|---|
| New high-efficiency gas furnace | wants to keep gas and has good ducts | No cooling unless you add AC or a heat pump |
| Dual fuel (heat pump plus furnace) | wants cooling and lower bills but keeps gas as backup | May qualify for the PSE hybrid rebate |
| All-electric heat pump | is ready to drop gas heat | May qualify for the PSE Duvall Heat Pump Program if eligible |
| Electric furnace to heat pump | heats with an electric furnace today | PSE electric resistance to heat pump rebate may apply |
Compare the heat pump side on our Duvall heat pump installation page.
Signs it is time for a new furnace
- The furnace is past 15 years and the repair list keeps growing.
- The quote to fix it is a big fraction of a new system.
- Upstairs bedrooms run several degrees warmer or colder than downstairs.
- Heating bills rise each winter without a change in habits.
- The burner flame looks lazy or yellow, or the unit booms at start-up.
- A carbon monoxide alarm goes off. Get everyone outside, call 911 and PSE, then call us.
Sizing the new furnace
Copying the size off the old furnace is the most common mistake in a replacement. Houses change: new windows, added insulation, a finished bonus room or an addition all shift how much heat the home actually loses. A furnace that is too large heats in short bursts, cycles on and off, and leaves some rooms stuffy and others cold. One that is too small runs without a break on the coldest nights.
We run a room-by-room heat-loss calculation, then check the ductwork against it. Static pressure tells us whether the ducts can move the air the new furnace needs. If they can’t, a larger return or a few sealed joints usually costs far less than the comfort problems they cause, and we show that as a separate, optional line.
What every installation includes
- Removal and disposal of the old furnace.
- A new filter rack sized for easy filter changes.
- Gas leak test and combustion check on gas units.
- Condensate drain or pump for condensing furnaces, routed so it can’t back up.
- Thermostat setup, with a walk-through of schedules and filter reminders.
- Permit, inspection and rebate paperwork handled by us.
Garages, crawlspaces and the valley floor
Anyone who drives SR 203 in winter knows the valley floor around Duvall floods most years between late fall and early spring. If your home is on low ground, we look at the furnace location with that in mind: raising the unit on a platform, keeping the condensate pump and electrical connections off the floor, and checking that crawlspace ducts are sealed and supported. In hillside neighborhoods above the valley, the more common problem is a long duct run to far bedrooms, which a load calculation and a return-air fix usually solve.
Financing and timing
A furnace rarely fails at a convenient time. If yours is limping, replacing it in early fall, before the first cold snap, gives you the pick of install dates and time to line up rebates. We offer monthly financing options on approved credit and show the monthly figure next to the cash price on every option, so the choice between a basic furnace and a heat pump system is side by side, not a surprise at the end.
Get a free estimateAn in-home visit and a written, upfront price before any work begins.
Permits and the installation
The City of Duvall requires permits for furnaces, air conditioners and heat pumps (City of Duvall, Permit Required). Electrical permits in Duvall come from Washington L&I (L&I, cities that do their own electrical permits). We pull both when needed and meet the inspector.
- Free estimate visit and written options.
- Permit and scheduling; most swaps are done in one day.
- Old furnace removed and hauled away, new unit set, venting and gas connected.
- Start-up checks, thermostat setup and filter walk-through.
- Rebate forms filed and final inspection passed.
Warranty and Home Comfort Club
We support the manufacturer’s warranty on covered equipment parts, and we stand behind our furnace installations with a 1-year labor warranty from installation.
Join our Home Comfort Club, a monthly membership starting at $15 a month, and a new system we install gets extended labor coverage for as long as your membership stays active, up to 5 years from installation. Ask your technician or comfort advisor for the current plan details.
Duvall furnace replacement FAQ
How much does a new furnace cost in Duvall?
Seattle-area data puts a new furnace at about $4,683 on average, with most jobs from $2,762 to $6,683 (Angi, July 2026). Gas furnaces cost more than electric. Our estimate is free and lists the exact model and price.
Is the PSE Duvall Heat Pump Program worth it instead of a new furnace?
For eligible PSE gas customers in 98019 and 98014, up to $8,000 toward a heat pump can make a heat pump cost about the same as, or less than, a new furnace, and it adds cooling. We price both so you can compare.
Who supplies gas in Duvall?
Puget Sound Energy supplies both natural gas and electricity in Duvall, so PSE’s gas and electric rebate programs can apply.
Do I need a permit to replace a furnace in Duvall?
Yes. The City of Duvall requires a permit for furnace, air conditioner and heat pump installs. We pull it and schedule the inspection.
How long does a furnace replacement take?
Most straight replacements take one day. Moves, venting changes or adding a heat pump can take two.
Can you install a furnace in a crawlspace?
Yes. Crawlspace installs take more labor, and on low ground we plan the unit height and drain so seasonal water stays away from the equipment.
What warranty comes with your work?
We support the manufacturer’s warranty on covered equipment parts, and our labor warranty covers installations for 1 year from installation. Home Comfort Club members (monthly membership starting at $15 a month) with a new system installed by Home Comfort Alliance get extended labor coverage for as long as their membership stays active, up to 5 years from installation.
Why Choose Home Comfort Alliance in Duvall?
Your Comfort is Our Promise
We promise...
Reliable heating, air conditioning, plumbing and electrical service, all from one trusted company.
To educate and guide you through your options so you’ll find the right solution at the right price.
Knowledgeable and respectful workers who ensure both your own comfort during the installation process, and lasting comfort from your home systems.
Outstanding service, communication, and follow-up, so your home is comfortable now and for years to come.
Get a furnace replacement estimate in Duvall
A Redmond-based comfort advisor will visit, measure your home and give you written options with PSE rebates and financing.
Get an estimate
A Redmond-based comfort advisor will call you to set up your visit.