Signs your ductwork is past sealing
We recommend sealing and cleaning first whenever that genuinely solves the problem. Replacement is reserved for cases where the ductwork itself has failed.
Crushed or disconnected sections
Ductwork that’s been physically crushed, torn loose, or disconnected in the attic can’t be sealed back to spec — it needs to be replaced.
Undersized for your system
If a newer, higher-capacity system was installed onto old ductwork sized for a smaller unit, airflow suffers no matter how well the old ducts are sealed.
Contamination beyond cleaning
Severe mold growth, pest infestation, or asbestos-era materials sometimes mean the ductwork itself needs to go, not just be cleaned out.
If your roof is already open, that’s the easiest time
When a roof replacement is happening anyway, the deck being open is the least invasive access point your ductwork will ever have — no ceiling cuts, no separate mobilization. We’re the only Central California contractor that combines full duct replacement with roofing work through the same open access point, sealed by a licensed roofer, not caulked by whoever installed the ducts.
What Fresno homeowners say
4.8 stars across 1,200+ verified Google reviews — Fresno, Clovis, Madera, Sanger, Selma, and surrounding Fresno County cities.
They replaced our AC and sealed the ducts at the same time. Didn’t know that was even possible with one company. House is cooler than it’s been in years and I have video proof of every step.
Our house is finally comfortable in the summer. They did the roof and the ducts at the same time — I didn’t even know that was possible. Best decision we’ve made as homeowners.
Grandmark did an amazing job fixing our roof and duct work together — recommend them 10/10. Thank you for making our home look great.
We’ll respond in 20 minutes or less
Tell us what’s going on with your ductwork and we’ll schedule a video-documented inspection. During business hours, that’s typically within 20 minutes.
Duct replacement FAQ
How do I know if I need replacement instead of sealing?
Replacement is necessary when ductwork is physically damaged, crushed, disconnected, undersized for your current system, or too contaminated to clean effectively. We inspect on video and recommend the least invasive fix that actually solves the problem — not automatically the most expensive one.
How long does full duct replacement take?
Most standalone duct replacements take 1-2 days depending on home size and ductwork complexity. If it’s combined with a roof replacement through the open deck, timing is coordinated with the roofing schedule.
Is duct replacement cheaper if done during a roof replacement?
Typically, yes — accessing ducts through an already-open roof deck avoids a second mobilization and ceiling cuts that a standalone duct job would otherwise require.
Do you offer financing for duct replacement?
Yes — $0 down and 0% interest for 18 months is available on qualifying jobs. See our Fresno HVAC financing options → for full details.
More ways we help Fresno homeowners
Duct Cleaning & Sealing →
Not sure replacement is necessary yet? See the less invasive options first.
Roof + Duct Combo →
Getting a new roof anyway? See why that’s the best time for duct work too.
X-Ray Diagnostic Process →
See how we diagnose the real cause before recommending any service.
Get your ductwork inspected on video
See exactly what’s happening before you commit to sealing, cleaning, or full replacement.