Whole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
Before
After
Before
After
Before
AfterFast, Reliable Duct Sealing Across East Hemet
Duct sealing in East Hemet typically runs $450 – $1,200 for a whole-house system, and most jobs are scheduled within a few days of your call. If your home was built between the 1970s and 1990s, there’s a strong chance your flex ductwork has sagged, separated at the collars, or developed leaks that your HVAC system is working overtime to overcome.
We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and our crews serve East Hemet from our Inland Empire office in Riverside-San Bernardino. We know the tract homes off Kirby Street, the manufactured home communities near the equestrian properties, and the older builds east of San Jacinto Street where Santa Ana winds drive fine desert silt straight into return-air systems. Our Duct Sealing team arrives uniformed, background-checked, and on time, with written pricing before any work starts and a 365-Day Done Right Promise on every job. Call (361) 326-5060 for a free estimate.
Why Hollis Air Duct Cleaning Is East Hemet’s Preferred Duct Sealing Company
We’ve been in business since 2004, and our reputation in East Hemet is built on showing up when we say we will and leaving the site clean. Homeowners here tell us the same story: they called another outfit that quoted a low price over the phone, then the invoice jumped once the technician was inside. That doesn’t happen with Hollis. The price is written down before we touch your system, and it doesn’t move at the door.
Our technicians follow The Garrison Code on every East Hemet job: arrive inside the quoted window, price in writing, complete the work by the book, and leave the site clean. Every repair is covered by our 365-Day Done Right Promise. If the seal fails within a year, we come back and make it right at no charge, including a free second visit.
Phones are answered by a live person 24 hours a day, 7 days a week. No voicemail loops, no callback queues, no waiting until Monday for a scheduling question.
Duct Insulation in East Hemet
Duct Insulation in East Hemet is often the missing piece after sealing work is done. In a climate where summer temperatures routinely exceed 100°F, uninsulated or poorly insulated duct runs in hot attic spaces can raise supply-air temperature by 8 – 15 degrees before it ever reaches your living room. We see this constantly in the 1970s – 1990s tract homes that dominate East Hemet’s housing stock, where original fiberglass wrap has compressed, torn, or fallen away entirely.
Our crew installs fresh insulation using Guardsman foil-backed products and mastic-sealed seams, sized to the actual duct diameter rather than stuffed on with tape. Typical Duct Insulation in East Hemet runs $300 – $800 depending on linear footage and attic accessibility.
Attic Heat Gain in Older Homes
East Hemet attics can reach 140°F in July. Without proper insulation, your cooled air is traveling through a convection oven. We measure supply-air temperature at the plenum and at the farthest register to document the actual loss.
Mobile Home Duct Runs
Manufactured homes in East Hemet often have thin, original insulation on belly-board duct runs. We re-wrap with proper R-value materials and seal the vapor barrier, which matters more here than in climate-moderated areas because of the extreme daily temperature swing.
HVAC Duct Sealing in East Hemet
HVAC Duct Sealing in East Hemet addresses the leaks, separations, and crushed runs that develop in aging flex duct systems. Our process starts with a visual and camera inspection of accessible ductwork, followed by pressure testing to quantify leakage against the conditioned envelope. We then seal accessible joints with mastic and foil tape, reconnect separated runs, and replace crushed or deteriorated sections with new flex duct supported properly to prevent future sag.
Typical HVAC Duct Sealing in East Hemet costs $450 – $1,200 for a whole-house system. Smaller manufactured homes or partial repairs may run $250 – $500. We use Nikro negative-air machines during the process to maintain containment, and we verify our work with a post-seal pressure test.
Pressure Testing Before and After
We measure duct leakage in CFM at 25 Pascals. East Hemet homes with original 1980s flex duct often test at 20 – 35% leakage. Our target is under 10%, and we show you the numbers.
Mastic vs. Tape in Desert Conditions
Standard duct tape fails in East Hemet’s heat. We use water-based mastic rated for 250°F plus foil tape at all seams, applied to clean surfaces after source removal so the bond actually holds through summer.
Trusted Brands We Service in East Hemet
We carry professional-grade equipment and materials from Nikro, Honeywell, Aprilaire, and Abatement Technologies, plus filtration and sealing products from Guardsman. For East Hemet homeowners, this means we don’t order parts and make you wait. Our vans stock Guardsman mastic, foil tape, and flex duct in common diameters so most sealing jobs are completed in a single visit. We also source Honeywell and Aprilaire filtration upgrades when your return system needs better protection against the fine silica and pollen load this area produces. The same tools commercial crews use on larger Inland Empire jobs are what we bring to your driveway.
Common Duct Sealing Problems We See in East Hemet Homes
- Sagging flex duct in hot attics. Original 1970s – 1990s flex duct in East Hemet tract homes was never designed for decades of 140°F attic exposure. The wire helix fatigues, the duct sags between supports, and the collar separates from the trunk line. Sealing a joint that has already separated just hides the real leak under mastic.
- Mineral crust preventing seal adhesion. Because much of East Hemet runs on well water and unpaved equestrian roads east of San Jacinto Street, duct runs here tend to hold a grit-plus-mineral crust that behaves differently than the fine silica dust in neighboring Hemet. It cakes on the air handler and flex duct walls and won’t pull free under negative pressure alone. That crust is also why duct sealing after a Santa Ana wind event is often the only fix that holds, since taping or mastic over a dirty joint fails in one heating season.
- Disconnected runs after wind events. Local technicians know that after a Santa Ana wind event, calls spike in the neighborhoods east of San Jacinto Street, where duct systems in older homes quickly fill with fine desert silt that can clog coils and reduce airflow. The pressure differential from a partially blocked return can pull apart weak joints.
- Undersized manufactured home duct runs. Manufactured and mobile home duct runs in East Hemet are often undersized for 100°F+ design days. Sealing a leak without checking static pressure and blower motor amp draw can push the system past its rated airflow, shortening compressor life.
Pricing for Duct Sealing in East Hemet, CA
A typical whole-house duct sealing in East Hemet runs $450 – $1,200. Manufactured homes or partial repairs start around $250 – $500. Duct Insulation added to the same visit runs $300 – $800 depending on linear footage. Ask us about bundling with East Hemet Dryer Vent Cleaning for a complete system refresh.
What moves the price: attic accessibility (blown-in insulation over ducts adds time), the linear footage of ductwork, how many separated runs we find, and whether we need to replace crushed sections rather than seal them. We do not quote per-vent pricing, and we do not bait you with a low phone quote that changes at the door. The price is written down before any work starts.
Every estimate is free. Call (361) 326-5060 to schedule.
We Also Serve Cities Near East Hemet
Hollis crews travel throughout Southern and Northern California for larger projects and multi-system work. We regularly serve Los Angeles, San Diego, San Jose, and San Francisco with the same written pricing and 365-Day Done Right Promise. For Duct Sealing in East Hemet, scheduling and dispatch are coordinated from our Inland Empire office for faster local response.
Serving East Hemet, CA - Our Local Coverage Area
We’re based in the East Hemet area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Duct Sealing in East Hemet
The Santa Ana winds pull fine silica dust from the San Jacinto Valley floor and heavy pollen from mature Eucalyptus and pepper trees directly into your return-air system. In East Hemet, much of this mixes with mineral crust from well-water properties and unpaved roads east of San Jacinto Street, creating a bonded layer that standard vacuuming won’t remove. We see the spike in calls within 48 hours of a wind event. Call (361) 326-5060 if your airflow dropped after the last blow.
Replace them if the flex duct is brittle, the inner liner is torn, or the insulation is saturated. Seal them if the material is intact but joints have separated or the duct has sagged. We inspect with a camera and give you a straight answer, not a sales pitch. Most 1980s East Hemet tract homes we see are candidates for sealing plus spot replacement of the worst runs.
Yes, and we do it regularly. Manufactured home duct runs in East Hemet are typically undersized and run through the belly board, which makes access different but not impossible. We check static pressure and blower amp draw before sealing to make sure we’re not pushing your system past its design limits in 100°F+ weather. Call (361) 326-5060 for an estimate.
In East Hemet, usually yes. The mineral crust and bonded silica on your duct walls will prevent mastic from adhering properly. We’ve revisited jobs where another company sealed over dirty joints, and the tape peeled within one summer. We pull the system under negative pressure with HEPA filtration and agitation tools first, then seal to a clean surface. The 365-Day Done Right Promise covers our work because we do it in the right order.
Signs of leakage include rooms that won’t hold temperature, a temperature split of more than 5 degrees between rooms, dust blowing from registers right after you change the filter, or your blower running continuously to compensate. Dirty ducts reduce airflow gradually; leaks create sudden hot spots and higher bills. We test with a pressure gauge and camera to show you which problem you actually have. Call (361) 326-5060 for a free inspection.
After a February Santa Ana wind event, a homeowner on Kirby Street called us about a 12-degree temperature split between the front bedrooms and the hallway thermostat. Our tech ran a camera inspection and found the original 1978 flex duct in the attic sagging, two disconnected runs off the main trunk, and a silica-and-mineral crust lining the return side. We pulled the system under negative pressure with HEPA filtration, agitation tools, and a Rotobrush, then sealed the crushed run and re-insulated the trunk with Guardsman mastic and foil tape. The split dropped to 3 degrees and the homeowner stopped running the blower motor continuously to compensate.
Ready to stop overworking your HVAC system? Call Hollis Air Duct Cleaning at (361) 326-5060 for a free duct sealing estimate in East Hemet. We’ll inspect your system, show you what we find, and give you a written price before any work starts. Every job is backed by our 365-Day Done Right Promise.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving East Hemet and the Inland Empire.