Leaking ducts undo good AC performance
A properly running AC system can still leave you with high bills and uneven cooling if the ductwork carrying that cooled air is leaking into your attic or crawlspace before it ever reaches a room. Sealing what’s already there is often the more affordable fix — full replacement isn’t always necessary.
Energy loss through leaks
Leaking ductwork can lose a significant share of conditioned air into your attic before it ever reaches a room — your system works harder to compensate, and your bill reflects it.
Dust & contaminant circulation
Ducts collect dust, allergens, and debris over years of use. Cleaning removes what’s built up; sealing keeps outside contaminants from entering through gaps.
Uneven room temperatures
If some rooms never quite reach the thermostat setting while others overcool, leaking or disconnected ductwork is a common, fixable cause.
We tell you which one you actually need
Cleaning removes existing buildup inside ducts that are otherwise structurally sound. Sealing addresses leaks and gaps at joints and connections without replacing the ductwork itself. Full replacement is reserved for ductwork that’s damaged, undersized, or too contaminated to clean effectively. We inspect on video before recommending any of the three — most homes need cleaning and sealing, not a full replacement.
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.
Three companies gave me quotes without even looking at the system. Grandmark ran a diagnostic and found the real issue. Saved me over $2,000 and my AC has been perfect ever since.
We’ll respond in 20 minutes or less
Tell us what you’re noticing — high bills, uneven rooms, or visible dust — and we’ll schedule a video-documented duct inspection. During business hours, that’s typically within 20 minutes.
Duct cleaning & sealing FAQ
How do I know if I need duct cleaning or duct sealing?
Cleaning addresses buildup inside ducts that are otherwise sound; sealing addresses leaks and gaps at joints and connections. Most homes need both together — we inspect on video and tell you honestly which applies to your system.
Will duct sealing actually lower my energy bill?
In most cases, yes — leaking ductwork forces your system to run longer to compensate for conditioned air lost before it reaches a room. Sealing those leaks typically improves both comfort and efficiency.
Do I need duct replacement instead?
Only if the ductwork itself is damaged, undersized for your system, or too contaminated to clean effectively. We recommend replacement only when cleaning and sealing genuinely won’t solve the problem.
Can duct cleaning improve my indoor air quality?
Yes — removing built-up dust and debris reduces what circulates through your home every time the system runs. See our indoor air quality services → for additional options like filtration and UV treatment.
More ways we help Fresno homeowners
Duct Replacement →
If your ductwork is damaged beyond sealing, see the full replacement process.
Indoor Air Quality →
Filtration, UV treatment, and humidity control beyond just the ductwork.
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 in your ductwork before you commit to cleaning, sealing, or replacement.