14 Best Furnace Replacement Companies in Seattle, WA (2026)
Why Seattle's damp winters make choosing a "Furnace Replacement" critical
Seattle's October–April rainy season makes choosing the best furnace replacement companies in Seattle, WA critical for damp homes and occasional freezing snaps. Searching for the best plumbing and furnace replacement companies in Seattle, WA is common among owners in Capitol Hill and Ballard needing reliable installation and corrosion-resistant components.
Quick Picks
Awards based on the same publicly available signals as the Vouched Score, including provider-stated certifications and dealer status. Not independently verified.
Which Seattle providers stand out for long warranties and 24/7 response?
| # | Provider | Score | Years | Best for | |
|---|---|---|---|---|---|
| 1 | GGreenwood Heating and Home Services | 89 | 4.9 (4,725+) | 105+ | ★ Highest Vouched ScoreFurnace + AC Changeout |
Editorial: Greenwood lists furnace and full-system replacements, including matched furnace+AC changeouts. Greenwood notes serving Seattle since 1921, about 105+ years. Greenwood advertises emergency response (24/7) and same-day replacement options. Greenwood reports financing options for high-ticket installations. Greenwood holds a strong Google Maps position locally in Seattle. Strengths:
Reviewers praise:
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| 2 | AAs You Wish Electric, Plumbing, Heating & Air | 87 | 4.9 (3,315+) | 20+ | Commercial Furnace Replacement |
Editorial: As You Wish lists flat-rate pricing, financing, and free estimates for major replacements. Strengths:
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| 3 | SSouth West Plumbing, Heating, Air, & Electric | 87 | 5.0 (1,210+) | 44+ | Gas Furnace Replacement |
Editorial: South West lists furnace replacement and gas-furnace changeouts as core services. The company reports serving Seattle since 1982. South West advertises same-day installs and 24/7 emergency furnace response. The website notes financing for larger changeouts. Seattle's damp winters increase condensate concerns for high-efficiency furnaces and proper venting matters here. Strengths:
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| 4 | GGene Johnson Plumbing | 86 | 4.8 (4,575+) | 50+ | High-Efficiency (95%+ AFUE) Upgrades |
Editorial: Gene Johnson Plumbing lists furnace replacement and gas furnace changeouts among core services. The company advertises high-efficiency systems and no-payments for 12 months. It notes emergency response availability, including same-day and 24/7 options. Seattle's cool, damp winters increase demand for properly sized gas furnaces. Founded 1976, Gene Johnson Plumbing has 50+ years of local trade experience. Strengths:
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| 5 | 22 Sons Plumbing, Sewer, Septic, Electric, Heating & Air | 85 | 4.9 (3,910+) | 9+ | |
Editorial: Full-system furnace and AC replacements are listed alongside matched changeouts on their site. Strengths:
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| 6 | EEvergreen Home Heating and Energy | 83 | 4.8 (1,000+) | 51+ | Manufacturer-Authorized Installer |
Editorial: Furnace replacement work is a core service, with residential changeouts emphasized. Evergreen Home Heating and Energy states Mitsubishi authorization for heat-pump equipment. The company advertises same-day emergency response for cold-weather failures. Evergreen cites free estimates, flat-rate pricing, and 18-month financing options. Seattle homeowners benefit from the firm's rebates alignment with Seattle City Light clean-heat incentives. Strengths:
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| 7 | BBrennan Heating, Air Conditioning, & Electric | 82 | 4.5 (2,240+) | 39+ | |
Editorial: Furnace replacement work is listed with named Lennox equipment and energy consultants. Brennan Heating lists 35+ years in business. Seattle's mild, wet winters increase the need for correct condensing venting and condensate management. Customer feedback cites same-day emergency responses and thorough installation crews. Strengths:
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| 8 | GGlendale Heating & Air Conditioning | 80 | 4.8 (705+) | 88+ | |
Editorial: Glendale Heating is a Lennox Dealer selling factory-aligned Lennox equipment. Glendale Heating notes flat-rate quotes and available financing options. Glendale Heating has served Seattle since 1938, about 85+ years. Glendale advertises same-week scheduling and reserves slots for no-heat emergencies. Reviews show many local installs and follow-through across King and Pierce Counties. Strengths:
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| 9 | AALPHA HEATING, COOLING, PLUMBING & ELECTRICIAN | 78 | 5.0 (10+) | 15+ | Proper SizingHonest Replace-vs-Repair |
Editorial: High-efficiency furnace and heat-pump installs are highlighted with named load calculations. Strengths:
Reviewers praise:
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| 10 | HHotWire Furnace, Air Conditioning & Appliance Repair Seattle | 75 | 5.0 (240+) | ||
Editorial: HotWire lists furnace replacement and installation among core services. HotWire advertises same-day emergency response across Puget Sound. HotWire notes they support second opinions and honest assessments. HotWire shows many Google reviewers citing prompt arrivals and thorough diagnostics. HotWire's service mix reflects Seattle's mild winters and common gas-furnace needs. Strengths:
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| 11 | GGo Green Heating AC & Electric | 72 | 4.8 (225+) | 10+ | |
Editorial: Offers financing for high-ticket heating replacements, per their site. Go Green Heating lists a WA contractor license dating to 2016. Seattle's damp winters favor properly sized, vented heating systems. Review snippets emphasize clear communication and on-time scheduling. Strengths:
Reviewers praise:
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| 12 | OOne Hour Heating & Air Conditioning | 68 | 5.0 (30+) | ||
Editorial: One Hour Heating & Air Conditioning lists furnace replacement and installation services for Central Seattle homes. Strengths:
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| 13 | NNortech Heating, Cooling & Refrigeration | 66 | 4.5 (150+) | ||
Editorial: furnace replacement with a gas-furnace focus and same-day emergency options. Nortech lists NATE-certified technicians on staff. Nortech advertises 24/7 emergency response and same-day service availability. Seattle's damp, chilly winters raise combustion-safety importance for gas furnace work. Nortech notes over 30+ years serving Puget Sound homeowners. Strengths:
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| 14 | SSeattle Heating & Cooling | 65 | 4.8 (80+) | ||
Editorial: Seattle Heating & Cooling advertises furnace replacement and full-system changeouts across the metro. Seattle Heating & Cooling lists financing through Wells Fargo for 12-month installation plans. The company advertises 24/7 emergency support and same-day replacement availability. Seattle winters' damp cold raises demand for dependable gas-furnace commissioning in many homes. Website content highlights installs on Lennox, American Standard, and Day & Night equipment. Strengths:
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Typical Furnace Replacement costs in Seattle, WA (2026)
Last updated
Estimated ranges for Seattle, WA. Actual cost varies with home size, equipment, and scope — always request a written quote for your job.
| Service | Typical range |
|---|---|
| Full gas furnace replacement (80% AFUE, installed) | $3,600–$7,800 |
| High-efficiency condensing furnace (95%+ AFUE, installed) | $5,400–$11,400 |
| Modulating / two-stage variable-speed (ECM) furnace upcharge | $720–$2,400 |
| Condensing-furnace venting + condensate conversion (80%->95% AFUE) | $720–$2,150 |
| Gas line / electrical / permit modification (changeout) | $180–$1,100 |
| Electric furnace / air-handler replacement (installed) | $2,400–$6,000 |
Nearby Washington furnace replacement pricing: Auburn · Bellevue · Bellingham
See broader context: Furnace Replacement pricing in Washington · Furnace Replacement pricing nationwide
How were these Seattle furnace replacement candidates evaluated?
This guide evaluated 6 Seattle furnace replacement candidates on Google review scores, emergency service availability, pricing models, certifications, and advertised installation practices. The most-weighted signals were Google review totals, stated emergency response, flat-rate pricing, and manufacturer or NATE credentials.
- Greenwood Heating and Home Services has a 4.9/5.0 rating based on Google reviews and very high review volume.
- South West Plumbing, Heating, Air, & Electric shows a 5.0/5.0 rating per Google reviews and long tenure.
- Four providers list flat-rate pricing, including As You Wish and 2 Sons, per their advertised signals.
- ALPHA and Nortech report NATE certification and proper-install tooling per provider disclosures.
- Emergency service availability was common; Many candidates advertise 24/7 or same-day response in provider data.
Ratings cited here are based on Google reviews; users should cross-check accreditation records per BBB records.
How do I choose a Furnace Replacement Company in Seattle?
- Verify the provider's Google rating and review count.
- Compare quoted pricing models, flat-rate versus itemized estimates.
- Confirm certifications such as NATE or manufacturer-dealer status.
- Request written warranty and permit-pulled confirmation.
- Check BBB records for accreditation and complaint history.
4 furnace problems Seattle homes report after a rainy winter — and when replacement is due
The most common furnace problems in Seattle follow prolonged October–April rain and damp indoor air, which promote corrosion, clogged burners, and insulation-damaged ductwork. Occasional freezing snaps can also reveal cracked heat exchangers or failed ignition components that prompt replacement discussions after inspection.
- Corroded heat exchanger and flue components. Persistent indoor dampness from Seattle's rainy season speeds metal corrosion, increasing crack risk and driving many homeowners to consider replacement after failed safety inspections.
- Short-cycling from moisture-laden controls. High humidity in Seattle can cause controlboards and sensors to malfunction, making furnaces cycle on and off too quickly and reducing system lifespan.
- Ignition and pilot failures after freezing snaps. Rare Seattle freezes stress ignition modules and pilot assemblies; repeated failures often indicate the unit is near end-of-life and may need replacement.
- Mold and insulation damage inside ductwork. Damp conditions promote mold growth and wet insulation in basements and crawlspaces, degrading airflow and indoor air quality and often prompting duct repairs or full system replacement.
How Seattle’s neighborhoods and mild-but-wet winters shape furnace replacement choices
Seattle’s mild-but-wet October–April winters drive corrosion and moisture-related failures in older furnaces. Homeowners compare furnace replacement companies compared Seattle, Washington because persistent damp shortens system life. Evaluated providers highlight emergency service, proper-install tooling, and efficiency upgrades to address these local needs.
Seattle’s long rainy season and elevated indoor humidity are the dominant local conditions. Damp air accelerates metal corrosion and electrical component failure in furnaces.
Impact example: corrosion shortens heat-exchanger life and raises safety inspection failure rates. Moisture also promotes mold in duct insulation near basements in Ballard and Queen Anne.
Evaluated providers respond by offering emergency service and flat-rate pricing for quick replacements. Many evaluated providers advertise 24/7 emergency service, which matters after sudden cold snaps in Capitol Hill and Downtown.
Equipment focus ties directly to local needs. Look for installers specifying furnace type selection and efficiency-tier upgrades to reduce runtime in humid conditions.
Installation quality matters in wet climates. Evaluated providers list proper-install tooling and NATE certification to ensure sealed flue connections and correct combustion setup.
How much disruption should Seattle homeowners expect during a "Furnace Replacement"?
- How do I get a quote from these furnace replacement companies?
- Submit one request on this page and we send it to the vetted furnace replacement pros in Seattle, WA listed here. They send quotes back — no obligation.
- How much does furnace replacement service cost in Seattle, WA?
- Full gas furnace replacement typically runs $3,600–$7,800, and high-efficiency condensing furnace runs $5,400–$11,400 in Seattle, Washington. See the Furnace Replacement pricing table on this page for the full per-service breakdown.
- Do Seattle contractors need a Washington license to replace a furnace?
- Yes. Washington State Department of Labor & Industries issues trade licenses required for furnace work. Contractors must hold the appropriate L&I trade license and be registered as contractors before contracting on Seattle projects. Confirm an installer’s L&I number and contractor registration to verify compliance with state and city requirements.
- When does the Seattle Department of Construction and Inspections (SDCI) require a permit for a furnace swap?
- SDCI typically requires a mechanical permit for furnace replacements that alter gas piping, combustion air, or flue terminations. Smaller like-for-like component swaps may be exempt, but permit rules vary by scope. Ask the installer which SDCI permits apply and request permit copies before work begins.
- How busy are Seattle furnace contractors during the October–April rainy season?
- Seattle contractors see their busiest period from October through April because damp, cooler weather increases failures. Book inspections early in September or October to avoid long lead times during peak season. Emergency service options become more limited during prolonged cold snaps, especially in Capitol Hill and Downtown.
- Do installers need special permits or inspections for gas-furnace replacements in Seattle?
- Yes. Gas-furnace replacements generally require both a mechanical permit from SDCI and an inspection of gas piping and combustion ventilation. Licensed tradespeople must perform gas work under Washington L&I rules. Always confirm that the contractor schedules required inspections with SDCI.
- Can furnace replacement be coordinated with air-conditioning upgrades in Seattle homes?
- Yes. Coordinating furnace and AC replacement is common, especially when matching efficiency tiers or shared ductwork needs attention. Coordinated installs reduce duplicate labor and can improve overall system balance. Request a single proposal that outlines ductwork, airflow testing, and combined permit needs.
- How should Seattle homeowners vet high-efficiency furnace proposals?
- Look for proposals that list specific equipment models, AFUE ratings, and manufacturer-dealer relationships. Ask for combustion-performance tests, sealed combustion explanations, and documented venting details. Verify installer credentials with Washington L&I and request written warranty terms and labor warranty duration.
- Is same-day furnace replacement realistic in Seattle emergency cases?
- Same-day replacement is offered by some providers, but availability depends on parts, staffing, and permit logistics. Many Seattle companies advertise emergency service and may complete same-day installs when they have compatible stock and required permits. Confirm same-day availability before hiring to avoid unmet expectations.
- What special considerations apply to commercial furnace replacement in Seattle?
- Commercial projects often require additional permits, building-code compliance, and coordination with SDCI for larger ventilation changes. Contractors should demonstrate commercial experience and submit engineered plans when required. Ask about liability coverage, planned downtime, and a written project schedule to minimize business disruption.