How much does whole-house humidifier installation typically cost?

Whole-house humidifier installation pricing is finalized after an in-home assessment because costs vary by equipment type, capacity, and access to your HVAC system. We install whole-home humidifiers as part of our Air Quality Services. Our team serves homes across King and Snohomish Counties.

Key factors that drive the quote:

• Equipment style and capacity, plus integration with your existing HVAC controls
• Ductwork and electrical access, including any needed modifications
• Water supply and drain routing to the unit’s location
• Placement constraints that affect labor time and materials

A small wiring upgrade can let your current thermostat manage humidity, which can cut install time compared to adding a separate controller. Our Membership Program supports better IAQ with scheduled 15 Point Cleaning and 22 point AC cleaning to keep systems running clean. Schedule an on-site check to size the unit correctly and avoid moisture issues. <br/> Updated: 2026-04-02 <br/> Need help in Bellevue, WA? Call (425) 616-3318 or book online. "Great and thorough furnace maintenance." — Lester Rubstello