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 Des Moines, WA
Old, unsafe or simply not worth another repair: whatever the reason, we swap the furnace for a new gas unit, an electric one or a heat pump sized to the house. Our Sumner branch covers Des Moines at (425) 645-0404, or use the form. A comfort advisor visits, measures and leaves you written options, incentives and financing, at no charge.
Most Des Moines houses have PSE gas available and all have PSE electricity (City of Des Moines, Community Services Directory), so you can choose between gas, electric and heat pump options.
New furnace costs
| Item | Seattle-area estimate |
|---|---|
| Average installed furnace | About $4,683 |
| Common range | $2,762 to $6,683 |
| Natural gas furnace | $3,800 to $10,000 |
| Electric furnace | $2,000 to $7,000 |
| Labor share of the job | About 20 to 30 percent |
Source: Angi, Seattle new furnace costs, updated July 2026. These are published ranges, not our prices. Your written estimate breaks out anything extra, such as venting, duct repairs, a thermostat or electrical work.
Get a free estimateAn in-home visit and a written, upfront price before any work begins.
Time to replace?
- It has been heating the house for 15 to 20 years or longer.
- It failed a safety test, or a cracked heat exchanger turned up.
- A repair bill shows up every winter, or the next one would be a big fraction of a new unit.
- The far bedrooms are always cold.
- Gas bills climb even though nothing about the household has changed.
- Startup comes with a bang, a rumble or a squeal.
If the furnace is younger and one part failed, our Des Moines heating repair team can usually fix it.
Options for your home
| Option | Why choose it |
|---|---|
| High-efficiency gas furnace | The simplest swap if you already heat with gas; plenty of heat in a cold snap |
| Gas furnace plus heat pump (dual fuel) | Heat pump carries fall, spring and mild winter days, gas takes the coldest hours, and you gain cooling plus a PSE rebate |
| Ducted heat pump with electric backup | Drops gas heating altogether and adds summer cooling |
| Electric furnace | Cheapest to install without gas service, costliest to run |
We price at least two options side by side. For houses near the airport, where windows stay shut in summer, the cooling that comes with a heat pump is often the deciding factor. PSE pays $1,500 toward a heat pump added to a gas furnace, with up to $2,400 more for income-qualified households (PSE hybrid heat pump rebate). See heat pumps in Des Moines.
Venting and the water heater
Going to a high-efficiency gas furnace moves its exhaust to plastic pipe through a wall or roof, and it starts producing condensate that needs a drain. The old metal flue stays behind, and if a gas water heater still uses it, that flue may now be too big for one appliance to draft properly. We check for this and reline or resize the vent when it is needed.
Ducts on sloped lots
Houses built on the slopes above the Sound often have ducts in damp crawlspaces, where joints separate and insulation drops away. Before sizing a new furnace we look at the ducts, because a leaky duct system makes any furnace seem too small. Sealing and reconnecting ducts, and adding a proper return, can be part of the same project.
Older houses
Ramblers and split-levels from the 1950s through the 1970s sometimes have old furnaces and ducts wrapped in materials that may contain asbestos. If we see suspect material, we stop and recommend testing before anything is disturbed. We also check the gas line, the electrical supply to the furnace and the clearances around it.
Replacing a furnace in a rental
Landlords: we work the estimate and the installation around your tenant’s availability, send the written numbers to you, and give the tenant a start time and a warning that the heat will be off during the swap.
Electric furnaces in townhomes and condos
Some townhomes and condos in Des Moines heat with a small electric furnace or air handler tucked in a closet. When one wears out, a like-for-like swap is the cheapest install, but a heat pump air handler in the same closet, with an outdoor unit where the HOA allows, cuts heating costs and adds cooling. PSE’s rebate for replacing electric resistance heat can apply to that switch.
Filters and air
A new furnace is a good time to fix the filter setup. Many older systems have a thin filter slot at the return grille that is easy to forget. A media filter cabinet at the furnace holds a deeper filter that lasts months, catches finer dust and smoke, and keeps airflow steady.
Thermostats and controls
Match the thermostat to the furnace. Staged and variable-speed models need a control that can use those stages, and a dual fuel setup needs one that decides when the heat pump hands off to gas. We program it and show you how the schedule works.
Permits and inspection
Des Moines issues mechanical permits through MyPermits Online (City of Des Moines, permit applications and information). A furnace replacement needs one, and new gas piping or electrical work may need more. We pull the permits and schedule the city inspection.
Installation day
Plan on one day for most swaps. Floors get covered, gas and power are shut off, the old unit comes out and the new one goes in with its gas, vent, wiring, duct and thermostat connections. Startup includes combustion and safety tests plus airflow and temperature-rise checks, and before leaving the crew shows you the filter and settings.
If it fails in the middle of winter
A winter breakdown does not have to force a rushed decision. Space heaters on separate circuits can carry you a night or two, away from bedding and curtains. If a safe repair can keep the old unit going for a few weeks while you compare options, we say so; if it is not safe, we shut it down and show you why.
Why Home Comfort Alliance
Puget Sound homeowners have called us since 1977. We are licensed, bonded and insured in Washington (WA Contractor Reg. #HOMECCA785BD), and as a PSE Trade Ally for HVAC we take care of the rebate forms. Learn more about our furnace replacement services or see all Des Moines services.
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.
Des Moines furnace replacement FAQ
What does a furnace replacement cost?
Published Seattle-area numbers average about $4,683 installed, with most jobs landing between $2,762 and $6,683; gas units span $3,800 to $10,000 and electric ones $2,000 to $7,000 (Angi, Seattle new furnace costs, updated July 2026). We price yours for free, in writing.
Is there a rebate for replacing my furnace in Des Moines?
PSE supplies gas and electricity in Des Moines (City of Des Moines, Community Services Directory). As of September 2026, PSE pays $1,500 toward a heat pump added to a gas furnace, plus up to $2,400 through Efficiency Boost (PSE hybrid heat pump rebate). We can price a dual fuel option next to a furnace on its own.
Do I need a permit to replace a furnace in Des Moines?
Yes. The City of Des Moines issues mechanical permits through MyPermits Online (City of Des Moines, permit applications and information). We pull the permit and book the inspection.
How long does a furnace replacement take?
Most take one day. Changing to a high-efficiency furnace with new venting, or adding a heat pump at the same time, can take a second day.
Should my new furnace be the same size as the old one?
Not necessarily. Many older furnaces were oversized. Our comfort advisor measures the home and sizes the new one to what the house actually needs.
Are furnace replacement estimates free?
Yes. Estimates for replacements and new installations are free.
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 Des Moines?
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 Des Moines
A Sumner-based comfort advisor will measure your home and give you written options with incentives and financing.
Get an estimate
A Sumner-based comfort advisor will call you to set up your visit.