Ductwork Cleaning, Sealing & Repair services in Seattle
Looking for a ductwork cleaning, sealing & repair in Seattle? Here's the short version of what we do, what it costs, and how soon we can be there. We're licensed, insured, and direct. No upselling, no door-to-door pitches, no hour-long sales appointments.
What's typical for this job
Most homes have leaky ducts losing 20-30% of conditioned air to attics and crawl spaces. Sealing the duct system is the highest-ROI HVAC improvement most homeowners can make.
We test ducts with a blower door + duct blaster, identify leaks, and seal them with mastic (better than tape long-term) or aeroseal injection.
Full duct replacement is rare — only on systems with collapsed flex-duct, severe pest damage, or major redesign needs. More common: targeted replacement of damaged sections plus sealing of the rest.
Ductwork Cleaning, Sealing & Repair in Seattle — what's typical here
Climate and housing age in Seattle tend to drive specific failure patterns. We see the same handful of issues every season.
That said, newer construction in Seattle has its own set of typical issues. We see both.
Ballpark numbers
For ductwork cleaning, sealing & repair jobs in the Seattle area:
- Duct leak test (blower door + duct blaster): $350 – $560
- Mastic duct sealing (whole house): $1,060 – $2,250
- Aeroseal injection: $1,750 – $3,500
- Damaged duct section replacement: $425 – $1,500
- Full duct system redesign + replace: $4,250 – $12,250
Other services we run in Seattle
- AC Installation & Replacement in Seattle
- Mini-Split & Ductless Systems in Seattle
- AC Maintenance & Tune-Ups in Seattle
A recent ductwork cleaning, sealing & repair call
Got a call last month from a the east Seattle home — original to home build. Symptom: upstairs always 6-8° hotter than downstairs. Cause: crushed flex duct in attic and 30% leakage. Replaced damaged section, sealed remaining ducts, added zone damper, temperature differential dropped to 1-2°, all done in the same visit, billed flat-rate at $1812.