#1 · SEATTLE
Indoor air quality work — filtration, duct sealing and cleaning, ventilation, whole-house fans — matters more on the wet side than people expect: tight, damp homes grow mold, and smoke seasons now arrive most summers.
Wet-side market range — get itemized quotes before work starts
Companies whose focus matches this work are listed first, then Seattle's other top-rated hvac pros. Same no-pay-to-play ranking as everywhere on Wetside Plumbing — the formula.
Google Business data, 2026-08-07. See the full Seattle ranking →
Also searched as: air duct repair and installation, air filter, electric air scrubber, home zoning systems, quietcool whole house fans.
A sealed home with MERV-13 (or better) filtration on a running air handler, or standalone HEPA units sized to the room. Duct leaks pull smoky attic/crawlspace air inside — sealing them is the sleeper fix.
After construction, rodent issues, or visible growth: yes. As routine annual maintenance: usually not — sealing and filtration deliver more per dollar.
Ask for their Washington L&I contractor number and verify it at secure.lni.wa.gov/verify — active license, bond, and insurance. Listings above with a green badge are ones we've already matched to an active license in state records.