Ductwork Repair across Las Vegas.
You’re paying to cool the whole house, but leaky ducts dump some of that cooled air into the attic before it ever reaches a room. Loose connections, torn flex duct, and gaps at the boots leave you with hot bedrooms and high bills. HVAC Thermo finds the leaks, seals the system, and tests the airflow so the cooling you pay for actually arrives.
When one room never cools and the AC itself checks out fine, the ductwork is usually the culprit. In Las Vegas attics, flex duct sags and pulls apart, tape lets go in the heat, and connections work loose over the years. I trace where the cooled air is escaping instead of just blaming the unit — that’s the fix that actually evens out the house, whether it’s a single-story home in Henderson or a two-story in Summerlin with a long attic run.
What I see most often on a ductwork repair call
- One room that’s always hot. A disconnected or crushed duct run starving a bedroom or office of airflow while the rest of the house cools fine.
- Cooled air lost into the attic. Leaks at joints, boots, and plenums leaking conditioned air into unconditioned space — you cool the attic and pay for it.
- High bills with weak results. The system runs constantly because so much of its output never reaches the living space.
- Torn or disconnected flex duct. Flex runs that have sagged, pulled apart at the collar, or torn open and dumped airflow into the attic.
- Uneven cooling room to room. Poor duct sizing, kinked runs, or leaks that leave some rooms cold and others stuffy.
- Dust and odors pulled in through return leaks. Gaps on the return side drawing attic dust and stale air straight into the system.
How ductwork repair works with HVAC Thermo
I start by testing airflow and following the duct runs to find where air is actually being lost. A lot of the worst leaks are out of sight in the attic — a boot that’s pulled away from the ceiling, a plenum joint that was never sealed, a flex run that’s been crushed by storage. Seeing the real leak points is what makes the repair worth doing.
From there I seal connections, repair or replace damaged sections, and reattach runs that have come loose, then check airflow again to confirm the rooms are getting what they should. Sealing the duct system means the cooled air you’re paying for reaches the living space instead of the attic — which usually shows up as more even rooms and a system that doesn’t have to run as hard.
If you’ve got a room that won’t cool or a bill that doesn’t match how the house feels, call +1 702-899-7693 and we’ll check the ductwork.
Ductwork repair by city
Need duct repair and sealing nearby? Start with the area closest to you in the Las Vegas Valley.
Why duct leaks cost you more in the Las Vegas heat
In most of the valley, the ductwork runs through the attic — and a Las Vegas attic in summer can sit well above 130 degrees. Every joint that leaks, every flex run that has pulled loose, and every boot that has separated from the ceiling is dumping the cooled air you paid for into that superheated space. The system never stops trying to catch up, so it runs longer, wears faster, and drives your energy bills higher while some rooms still never feel comfortable.
The desert climate also works against the materials. Old cloth duct tape dries out and lets go, mastic that was applied thin cracks, and flex duct sags and tears under years of heat cycling. That’s why duct problems here tend to get worse on their own rather than holding steady. Finding and sealing the real leak points — then confirming the airflow at the registers — is what turns a system that struggles into one that delivers even, efficient cooling across the whole house, from Henderson suburbs to homes near Boulder City.
How we find and fix duct problems
Duct faults hide in attics and crawl spaces, which is why they go unaddressed for years while people replace equipment instead.
- 1. We start with symptoms and measurements. Which rooms underperform, at what time of day, and in which season. Then static pressure across the air handler and airflow readings at the registers, so we are working from numbers rather than impressions.
- 2. We inspect the system physically. Attic and crawl space runs, plenum connections, the return, and every accessible joint. Disconnected branches, crushed flex, kinked runs, sagging duct, and failed tape at the collars are the usual finds — and they are visible once someone actually looks.
- 3. We locate leakage rather than guessing at it. Pressurizing the system reveals where conditioned air is escaping. In a valley home most of that loss is in the attic, where the surrounding air can reach 140 degrees in summer.
- 4. We repair with materials that survive an attic. Mastic and mesh at joints and seams, mechanically fastened connections, foil-backed tape rated for the application, and R-8 insulation restored over repaired sections. Cloth duct tape fails in attic heat within a season or two — we do not use it.
- 5. We retest and rebalance. Static pressure and register airflow measured again after the work, dampers adjusted, and the before-and-after numbers shown to you. If a repair did not measurably change anything, you should know that too.
Duct repair for homes and commercial buildings
Residential ductwork
Flex duct running through attics, older rigid trunk systems in homes from the seventies and eighties, and the hybrid arrangements that result when additions and remodels get tied into an original system. Two-story homes with a hot upstairs are among the most common calls.
Return-side problems are the ones most often missed. An undersized or leaking return starves the whole system and no amount of adjustment at the supply registers will fix it — which is why we check it before recommending anything to your cooling equipment.
Commercial ductwork
Rooftop unit supply and return drops, distribution in suspended ceilings, and tenant-improvement work where walls moved but the ductwork did not. Suites that were subdivided over the years are frequently left with branches feeding spaces that no longer exist.
We handle repairs, sealing, and rebalancing for these systems alongside our commercial HVAC service, scheduled around business hours.
What sealing your ducts actually changes
Duct repair is one of the few HVAC jobs where the improvement is immediate and measurable at the register.
- Cooling that reaches the rooms you paid to cool. Air escaping into a 140-degree attic is capacity you bought and never received. Sealing that loss puts it back at the registers with no change to the equipment.
- Rooms that finally balance. The far bedroom that never keeps up is usually at the end of a leaking, kinked, or partly disconnected run. Fixing the run solves it in a way that thermostat adjustment cannot.
- Lower summer power bills. When less cooling is lost in transit, the system reaches setpoint sooner and runs less. This is one of the most reliable efficiency improvements available in a valley home.
- Less dust in the house. Leaks in the return draw attic air, insulation fibers, and dust directly into the system, bypassing the filter completely. Sealing the return side cuts that at the source.
- Longer equipment life. High static pressure from restricted or damaged ducts makes the blower work harder and keeps the system running longer to hit setpoint. Both shorten equipment life.
- Better results from any new system. Installing efficient equipment onto leaky ducts wastes much of what you paid for. Repairing ducts first is what makes an AC replacement perform the way the rating suggests.
Seal the existing ducts, or replace the run?
Sealing and repair is enough
When the duct material is sound and the problems are at the connections — failed tape at collars, open longitudinal seams, a branch pulled loose, or missing insulation on otherwise good flex. That describes most of what we find.
Targeted repair costs a fraction of replacement and, done with mastic rather than tape, lasts. If the ducts are also full of debris, it is worth combining the work with duct cleaning while access is open.
Replacement is the better value
When flex duct has degraded — inner liner torn, insulation compressed or fallen away, sections crushed by attic storage or foot traffic. Patching a run that is failing along its length is money spent twice.
Replacement is also right when the ducts are simply undersized for the equipment. No amount of sealing fixes a trunk that cannot carry the required airflow; that needs redesign, not repair, and we will tell you which one you have.
Protecting a duct system in a desert attic
Ductwork here lives in brutal conditions. A few habits keep repairs from becoming annual events.
- Do not store anything on attic ducts. Boxes resting on flex duct crush it, and a crushed run loses most of its airflow. This is the single most common avoidable duct problem in valley homes.
- Walk only on joists in the attic. Stepping on a duct run collapses it and pulls connections apart at the collar. Anyone going up there — including trades — should know where to step.
- Keep every register open. Closing vents to redirect air raises system static pressure and pushes more air out through existing leaks. It rarely helps the room you wanted and reliably hurts the system.
- Have insulation checked after any attic work. Roofers, solar installers, and electricians frequently disturb duct runs. A quick look afterward catches a disconnected branch before you spend a summer wondering why one room changed.
- Treat sudden room-by-room changes as a signal. A room that was fine last summer and is not this summer usually means a branch came loose, not that the equipment is failing.
- Include a duct check in annual service. A visual inspection during your maintenance visit catches small separations while they are still a ten-minute fix.
Why we check the ducts before recommending equipment
A surprising number of homeowners are sold new air conditioners to solve problems their ductwork was causing. The new system goes in, the hot room stays hot, and the leak in the attic keeps costing money — now with a bigger unit pushing air through it.
We look at the delivery system before the equipment, because that is the order the diagnosis should go in. If sealing a return and reconnecting two branches will fix your comfort complaint, that is what we will tell you, even though it is a much smaller job than a changeout. HVAC Thermo is owner-led and we do not work on commission — more on our about page, and the full service list is on our services page.
We repair and seal ductwork throughout the Las Vegas Valley, including Henderson, Summerlin, North Las Vegas, Spring Valley, Paradise, Enterprise, and Centennial Hills. If rooms will not balance or bills keep climbing, call +1 702-899-7693 or book an inspection.
Ductwork repair across the Las Vegas Valley
Ductwork repair questions Las Vegas customers ask
How do I know if my ductwork is leaking?
Why does one room in my house stay hot while the rest is cool?
Can leaky ducts really raise my energy bills?
Is sealing my ductwork better than replacing it?
Why are my attic ducts a problem in Las Vegas?
Will sealing my ducts help with dust in the house?
Systems we service & related HVAC help
The systems and components we work on for ductwork repair, plus other ways HVAC Thermo keeps Las Vegas comfortable.
Brands & systems we service
Related HVAC services
Need ductwork repair in Las Vegas?
Call HVAC Thermo to find and seal the leaks, even out your rooms, and get the cooled air you pay for back into the living space across the Las Vegas Valley.
Call +1 702-899-7693 Request Service +1 702-899-7693