Quick Answer: Air duct replacement in the Bay Area costs $35–$55 per linear foot, with most homes requiring $5,000–$15,000 for complete duct system replacement. A partial duct replacement (section repair) costs $300–$1,200. Duct sealing (Aeroseal or mastic) is a more affordable option at $1,500–$4,000 that can eliminate 20–30% air loss without full replacement. Bay Area homes built before 1980 frequently have fiberglass duct board that has deteriorated or flex duct installed with poor connections. Leaky ducts can waste 25–40% of HVAC energy in Bay Area homes — duct sealing often pays back in 2–4 years through PG&E savings.
Duct Repair vs. Replacement — Bay Area Decision Guide
| Situation | Recommendation | Cost Range |
|---|---|---|
| Ducts under 15 years old with leaks | Duct sealing (Aeroseal or mastic) | $1,500–$4,000 |
| Ducts over 20 years, fiberglass board | Full replacement | $5,000–$15,000 |
| Single section crushed or disconnected | Section repair/replacement | $300–$1,200 |
| Ducts in unconditioned attic w/ poor insulation | Replace + insulate (R-8 minimum) | $6,000–$18,000 |
| New HVAC system installed | Evaluate ducts as part of project | Often bundled |
Question: How do I know if my air ducts need to be replaced in my Bay Area home? Signs your Bay Area home needs duct work: (1) Some rooms are significantly hotter or cooler than others (more than 5°F difference room-to-room); (2) PG&E bills are unusually high relative to home size and usage; (3) Visible dust blowing from registers when the system turns on; (4) HVAC runs constantly but never quite reaches set temperature; (5) You can hear air hissing or whistling from duct connections in the attic; (6) Age over 20–25 years (fiberglass duct board lifespan). Bay Area HVAC contractors can perform a duct blaster test — measures exact leakage rate and identifies problem sections — for $200–$400. This test tells you whether sealing or replacement is the right fix before spending thousands.
Watch: San Jose Remodeling Projects by Quartz Construction
Watch: Bay Area Remodeling Insights
Expert tips and real project walkthroughs to help you plan your Bay Area home improvement.
What Our Bay Area Clients Say
4.9 ★ average rating across Google, Yelp, and Houzz from 150+ Bay Area homeowners.
"Quartz Construction did an amazing job on our kitchen remodel. The team was professional, on time, and the results exceeded our expectations. Highly recommend to any Bay Area homeowner!"
— Michael T. |
"We hired them for a bathroom remodel in our San Jose home. From permitting to final walkthrough, everything was handled perfectly. The tile work is stunning. 5 stars without hesitation."
— Sarah L. |
"Just finished our ADU garage conversion. The project came in on budget and on schedule — rare in the Bay Area! The rental income already started. Could not be happier with Quartz Construction."
— David R. |
Follow Us
See our latest projects, client photos, and Bay Area remodeling tips:
Get a Free Estimate
Licensed Bay Area contractor — CSLB #1003436 — serving San Jose, Fremont, Oakland, Santa Clara, Sunnyvale and all Bay Area communities.
Call: (650) 749-7436
Get a Free Estimate from Quartz Construction
Licensed General Contractor • CSLB Lic#1003436 • Serving San Jose, Santa Clara & Bay Area
Recent Projects — Quartz Construction & Remodeling
Google Reviews — What Our Clients Say
Get Your Free Estimate
Quartz Construction & Remodeling | CSLB #1003436 | Licensed, Bonded & Insured
Phone: (650) 749-7436
Address: 1777 Hamilton Ave #1080, San Jose, CA 95125
Hours: Mon–Sat 7am–7pm | Free Estimates
Service Area: San Jose, Santa Clara, Sunnyvale, Mountain View, Los Gatos & Bay Area
