Duct Sealing
Mastic sealant or Aeroseal fills gaps and small holes from inside the duct. Sealing costs 500 to 1,500 dollars for most homes. It works best when the duct frame is sound and the ducts are under 15 years old.
Duct Decision Guide
Duct Sealing vs Duct Replacement Sacramento: Local Cleaning Comparison
Leaky ducts waste money. The fix is either sealing or full replacement. This guide helps you choose the right path for your Sacramento home.
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Duct Sealing vs Duct Replacement in Sacramento
Fresh Air Heating and Air has fixed duct systems across Sacramento since 2009. We test your ducts first, then tell you what they need. We do not push full replacement when sealing will do the job. Call (916) 416-8181 for a free in-home estimate.
Duct Replacement
Full replacement removes all old ducts and runs new ones. It costs 3,000 to 8,000 dollars for a full home. It is the right call when ducts are crushed, moldy, or were sized wrong from the start.
Fresh Air Duct Diagnostics
We use a blower-door style test to find your leak rate. We check for damage, mold, pest issues, and sizing errors. You get a clear report and a firm quote before any work starts.
Fresh Air Heating and Air is not affiliated with, endorsed by, or sponsored by Aeroseal or any other duct-sealing brand mentioned on this page.
Our Duct Diagnostic and Repair Process
- Duct leakage test to find your home's actual loss rate.
- Visual inspection of all accessible duct sections.
- Check for mold, pest damage, crushing, or poor sizing.
- Mastic or tape sealing for sound ducts with minor leaks.
- Aeroseal process for hard-to-reach gaps in existing ducts.
- Full replacement when structure or sizing is wrong.
- Permit coordination for replacement work in Sacramento County.
- Free in-home estimate with no obligation.
How to Choose Between Sealing and Replacement
Sealing wins when your ducts are structurally sound and under 15 to 20 years old. Small gaps at joints and seams let conditioned air leak into the attic or crawl space. Mastic sealant or Aeroseal closes those gaps at a fraction of the cost of new ducts. Most Sacramento homes with minor leaks can cut energy waste by 20 to 30 percent with sealing alone.
Replacement wins when ducts have collapsed sections, heavy mold, pest damage, or were sized wrong for your current AC unit. Sealing a duct that is the wrong size does not fix the airflow problem. If your ducts are over 20 years old and show physical damage, full replacement is the better long-term value. Fresh Air has done 900-plus installs and can tell you which option fits your home after one visit.
Duct Sealing vs Duct Replacement Sacramento: Local Cleaning Comparison FAQ
How do I know if my ducts need sealing or replacement?
A duct leakage test gives a number. Under 10 percent leakage is good. Over 20 percent usually means sealing or replacement is needed. We run this test at the estimate visit.
What does Aeroseal cost vs mastic sealing?
Mastic sealing runs about 500 to 1,500 dollars for most homes. Aeroseal costs more because it uses pressurized sealant particles to reach hidden gaps, but it can seal areas mastic cannot reach.
Can I seal ducts myself?
You can seal visible joints with UL 181-rated foil tape or mastic. But attic and crawl-space sections are hard to reach and seal correctly. A pro test confirms the job actually worked.
Does duct replacement require a permit in Sacramento?
Yes. Full duct replacement is a mechanical permit in Sacramento County and most cities. Fresh Air pulls all required permits and the work is inspected before we close the job.
Get a Free Duct Diagnostic Estimate
Call (916) 416-8181 or visit our contact page. Fresh Air is licensed CSLB number 945361, insured, and has served Sacramento homeowners since 2009. We test before we quote and use milestone billing so you pay as work is done.