Basic
$389 – $1,168 each
Bypass evaporative humidifier on the furnace plenum with bypass duct, manual humidistat, water line and drain
Supply and install one whole-house humidifier (bypass or fan-powered) on an existing furnace, including water line and humidistat.
Built In Humidifier in Seattle, Washington typically costs $458 to $1,374 each as of 2026. Prices reflect local labor and material rates. Use our calculator below for a detailed, ZIP-code-adjusted estimate.
Prices in Seattle are 19.0% higher than the national average for built in humidifier.
National average: $400 – $1,200 each
$389 – $1,168 each
Bypass evaporative humidifier on the furnace plenum with bypass duct, manual humidistat, water line and drain
$458 – $1,374 each
Larger-capacity bypass humidifier with automatic digital humidistat and outdoor temperature sensor, water line and drain
$573 – $1,718 each
Fan-powered evaporative humidifier with digital automatic control and outdoor sensor, no bypass duct needed, wired to the furnace
| Component | Category | Price Range | Unit |
|---|---|---|---|
| Materials | material | $187 – $562 | each |
| Labor | labor | $188 – $563 | each |
| Supplies & Other | supplies | $50 – $150 | each |
| Equipment & Disposal | equipment | $33 – $100 | each |
Labor costs in Seattle run proportionally higher than materials, which may favor material-heavy solutions.
Connect with local built in humidifier contractors in Seattle for personalized quotes based on your specific project.