Stop Losing Air Through Leaky DuctsPortland Duct Sealing
The average Portland home bleeds 20–30% of its heated and cooled air through duct leaks. We seal them up so that air goes where it's supposed to.
See How Duct Sealing Saves You Money
Watch what happens when you stop paying to heat your attic and crawlspace.
The Real Cost of Leaky Ducts in Portland
ENERGY STAR says the typical home loses 20–30% of conditioned air through duct leaks. In Portland — where we run heat from October through May and AC in the summer — that's hundreds of dollars a year heating your crawlspace and cooling your attic. Leaky ducts also suck in dust, allergens, and pollutants from unconditioned spaces. Sealing with mastic sealant permanently closes those leaks, cutting waste and cleaning up your indoor air.
What Duct Sealing Actually Does for You
Sealed ducts deliver results you'll notice on your next energy bill — and feel in every room.
Lower Energy Bills
Stop bleeding 20–30% of your conditioned air into unconditioned spaces. Most homeowners see a 15–25% drop in heating and cooling costs after sealing.
Even Temperatures
When all the air your HVAC produces actually reaches your rooms, hot and cold spots disappear. Every room gets the comfort it should.
Better Indoor Air Quality
Sealed ducts keep attic insulation dust, crawlspace mold spores, and other pollutants from getting sucked into your air stream.
Reduced HVAC Strain
When your ducts don't leak, your furnace and AC run shorter cycles. This extends equipment life and reduces repair frequency.
Safer Home Environment
Sealed ducts prevent backdrafting of combustion gases from gas appliances and block entry of carbon monoxide from attached garages.
Improved Humidity Control
Leaky ducts can draw humid air from crawlspaces or dry attic air. Sealed ducts help your HVAC maintain proper humidity levels.
6 Signs Your Ducts Are Leaking
High Energy Bills
PGE or NW Natural bills higher than they should be? Leaky ducts could be wasting 20–30% of the air you're paying to heat and cool.
Rooms That Won't Reach Temperature
Back bedroom stays freezing in winter no matter what you set the thermostat to? Conditioned air is probably escaping through duct leaks before it ever reaches that room.
Excessive Dust in Your Home
Leaky ducts in the attic or crawlspace pull in dust and debris, then blow it into every room. If you're dusting twice a week and it still piles up, your ducts are likely the culprit.
Weak Airflow from Vents
Hold your hand up to a register. If the airflow feels noticeably weaker than it used to, conditioned air is escaping through gaps before it reaches the vent.
Visible Gaps or Disconnections
Crawl up into the attic or peek in the crawlspace. If you can see gaps at duct joints or sections that have pulled apart, you're hemorrhaging conditioned air.
Stuffy or Musty Air Quality
Musty smell when the system kicks on? Leaky return ducts pull contaminated air from crawlspaces, attics, and wall cavities directly into your living space.
Suspect Your Ducts Are Leaking?
We'll run a duct leakage test and give you a detailed sealing estimate — no charge.
Call (503) 698-5588 for Free EstimateHow We Seal Your Ducts — Start to Finish
Inspect, seal, verify. Here's what a typical job looks like.
Full Duct Inspection
We check every accessible duct run in the attic, crawlspace, basement, and unconditioned areas. We mark leaks at joints, connections, and boot-to-drywall transitions, and photograph everything.
Duct Leakage Testing (Optional)
For homes with major efficiency concerns, we run a duct blaster test to measure exactly how much air you're losing. That gives us a baseline number to prove the improvement after sealing.
Surface Preparation
We clean duct surfaces to ensure sealant adheres properly. Dust and debris are removed from joint areas, and any damaged sections are repaired before sealing begins.
Professional Sealing
Mastic sealant goes on every joint, seam, and connection. Bigger gaps get fiberglass mesh embedded in mastic for a permanent repair. We also seal the boot-to-drywall connections where registers meet walls and ceilings — a spot most companies skip.
Verification Testing
After sealing, we check airflow at every register and can run a post-sealing duct blaster test to document how much leakage we eliminated. You get full documentation of the work.
Materials That Actually Last
No duct tape here. We use materials rated to last decades:
- Mastic Sealant: Water-based adhesive that hardens permanently and flexes with temperature changes
- UL-Listed Foil Tape: Heat-resistant aluminum tape for metal-to-metal connections
- Fiberglass Mesh: Reinforcement for large gaps embedded in mastic for permanent repair
Note: We never use cloth "duct tape"-despite its name, it fails within a few years and is not suitable for HVAC ductwork.
Serving Portland Metro Area
Duct sealing for homes and businesses across the greater Portland area
Portland Duct Sealing FAQs
Related HVAC Services
Duct Cleaning
Pull out accumulated dust and debris once your ducts are sealed tight.
Duct Insulation
Wrap sealed ducts with insulation for the biggest possible energy savings.
Ductwork Modifications
Reroute or resize ductwork for better airflow and even temperatures.
Energy Audits
Full home energy assessment to find every place you're losing money.
Done Paying to Heat Your Attic?
Free duct sealing assessment — find out how much air you're losing and what it'll cost to fix.
Free estimates • Professional-grade materials • Since 2008