Furnace/HVAC Replacement Cost in Seattle (2026)
Average cost in Seattle
US$5,550 — US$24,500
US$15 — US$18 per sq ft
Cost Breakdown
ItemizedNew R-454B compliant furnace/AC/Heat Pump
45%
Licensed Seattle HVAC technician hours ($90-$160/hr)
40%
Line sets, pads, electrical, and minor ducting
10%
Seattle Mechanical/Furnace permits and 2 inspections
2%
Eco-friendly recycling of old unit and refrigerant
3%
Sales Tax at 6.5%
📋What's Included
ScopeTypically Includes
- Furnace or AC unit
- Thermostat
- Basic ductwork connections
- Refrigerant
- Labor & installation
- Old unit disposal
Typically Excludes
- Full ductwork replacement
- Zoning systems
- Smart home integration
- Permits & inspections
- Humidifier or air purifier
Based on a standard 2,000 sq ft home with existing ductwork.
🧮Estimate Your Cost
InteractiveEstimated Cost
US$6,340 — US$9,510
Based on 8 sources and market data for Seattle. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
US$11,765
Today
US$12,765
Furnace/HVAC Replacement in Seattle is ↑ 8.5% compared to roughly a year ago — about US$1,000 more on the average project.
Comparison derived from the year-over-year change rate, not a month-by-month price index. We don't store historical snapshots yet — when we do, this will become a real time series.
🏢Top HVAC Replace Contractors in Seattle
Verified providersHotWire Furnace, Air Conditioning & Appliance Repair Seattle
10202 5th Ave NE Suite 200, Seattle, WA 98125, USA
216 reviews
Greenwood Heating and Home Services
14027 Interurban Ave S, Seattle, WA 98168, USA
4,458 reviews
AAA Heating & Air Conditioning
4150 Lind Ave SW, Renton, WA 98057, USA
4,662 reviews
Provider data sourced from public business directories. Ratings and reviews are public and may change. LookupCost is not affiliated with listed providers.
💬What People Actually Paid
Community❓Common Questions
As of January 1, 2026, all new installations must use low-GWP refrigerants like R-454B or R-32. This transition required a total equipment redesign, adding roughly 10% to 30% to the cost of units compared to older R-410A systems.
Seattle residents can access the Washington State HEAR program, offering point-of-sale rebates up to $8,000 for heat pumps. Additionally, Seattle City Light provides 'Clean Heat' rebates ranging from $2,000 to $6,000 for oil-to-electric conversions.
While the Washington State Energy Code has phased out gas in most new construction, homeowners can still replace existing gas furnaces. However, many are switching to hybrid 'dual-fuel' systems or full heat pumps to qualify for the $2,000 federal tax credits and local utility incentives.
If your home lacks central air or existing ducts are failing, full ductwork installation in Seattle typically adds between $3,000 and $12,000 to the project total, depending on home size and accessibility.
📊Our Methodology
How we collect dataAggregated from 5+ verified web sources and cost databases
Licensed contractor estimates and regional cost guides
Government construction and labor statistics
Community-reported project costs and reviews
Last data collection: 4 days ago. Updates run weekly. All costs in USD.
About this data
Cost figures are estimates synthesized from public market data using AI research and refreshed regularly. Real project costs vary by scope, materials, contractor, and site conditions. Always get verified quotes from licensed contractors for your specific project.
Spotted bad data? Let us know — we'll review and update.