Duct Sealing in Highland - Tested First, Written Price Second

Fast, Reliable Duct Sealing Across Highland

Duct sealing in Highland, CA typically costs $400 – $1,200 for a whole-home seal depending on accessibility and condition, with most jobs completed in a single visit. We dispatch our Duct Sealing in Highland crews from our Inland Empire office, so Highland homeowners get scheduling that respects their time, not a four-hour window that stretches to six.

Call (361) 326-5060

We’ve been working Highland’s neighborhoods long enough to know what waits in those attics. The 1950s-1970s tract homes east of Base Line, the ranch-style houses near Highland Avenue, the split-levels tucked against the San Bernardino foothills, they all share something: original rigid metal ductwork that has baked through forty, fifty, sixty summers of Inland Empire heat. The joints separate. The takeoffs pull loose. The mastic someone slapped on in 1987 has turned to dust. We’re Hollis Air Duct Cleaning, part of the Garrison Partners family, and we seal what other crews vacuum past. Call (361) 326-5060 for a free estimate.

Why Hollis Air Duct Cleaning Is Highland’s Preferred Duct Sealing Company

Our reputation in Highland was built on showing up inside the window, pricing in writing before we touch anything, and leaving the site clean. That’s The Garrison Standard, and it’s how every Hollis crew operates, whether we’re working a 1960s ranch near San Manuel Avenue or a newer build off Greenspot Road.

Highland homeowners call us back because we find what others miss. A standard duct cleaning in a mid-century tract home here often reveals disconnected supply runs and crushed returns that no amount of vacuuming will fix. We explain what we see on camera, write the price for sealing it, and get to work. No estimate that balloons once we’re in the attic.

Our technicians are background-checked and uniformed. You know who’s walking into your home before they arrive. And if the seal fails within a year, we return and make it right at no charge. That’s the 365-Day Done Right Promise, backed in writing on every Highland job.

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 to book your appointment.

Duct Insulation in Highland

Duct Insulation in Highland addresses a specific problem: those original metal ducts running through 140-degree attics during July and August, bleeding cooled air into the void before it ever reaches your living room. In Highland’s semi-arid climate, where air conditioning runs eight months of the year, uninsulated attic ducts can waste 20 – 30% of the energy your system consumes. Typical duct insulation in Highland runs $600 – $1,800 depending on linear footage and attic accessibility.

When Attic Heat Kills Efficiency

We insulate after we seal. There’s no point wrapping R-6 flex around ducts that are still leaking at the joints. In Highland’s older homes, we often find that the original metal runs were never insulated, or the fiberglass wrap disintegrated decades ago. We use professional-grade materials from Abatement Technologies and Guardsman to bring those attic lines up to current standards.

Matching Insulation to Your System

Not every Highland home needs the same approach. A system with a variable-speed blower and a high MERV filter can handle insulated flex transitions that a single-stage unit cannot. We size the insulation to the equipment, not the other way around.

HVAC Duct Sealing in Highland

HVAC Duct Sealing in Highland is the mechanical and mastic sealing of leaks, separations, and failed joints in your forced-air duct system. In Highland’s mid-century housing stock, this is rarely a quick caulk job. Original rigid metal ductwork in homes built from the 1950s through the 1970s suffers from decades of thermal expansion and contraction, Santa Ana wind vibration, and the simple settling of time. Typical HVAC duct sealing in Highland runs $400 – $1,200 for a whole-home seal, with camera inspection and source removal additional if needed.

Camera Inspection Before Sealing

We run a camera first. In a 1960s tract home off Base Line, we recently found two disconnected supply runs and a crushed return that a visual attic walk would never have caught. Sealing the visible gaps while leaving those open ends behind the registers is exactly how desert dust bypasses your filter entirely. We don’t guess. We look.

Mastic, Tape, and Mechanical Reconnection

Our crews use UL-181 mastic and foil tape on accessible joints, mechanical reconnection on separated takeoffs, and HEPA containment during any source removal. The Rotobrush agitation tools run under negative pressure from our Nikro equipment so nothing migrates into your living space during the work.

Trusted Brands We Service in Highland

Hollis stocks parts and materials from Rotobrush, Nikro, Abatement Technologies, and Guardsman for Highland jobs, which means faster turnaround and no waiting on a parts run to San Bernardino. Our rotary brush systems and negative-air machines are the same tools commercial crews use in hospitals and schools, not hardware-store rentals. When we recommend a specific sealant or insulation product for your Highland home, it’s because we’ve tested it in Inland Empire conditions, not because it’s the cheapest option in the catalog.

Common Duct Sealing Problems We See in Highland Homes

• Separated rigid metal joints in mid-century attics. Highland’s 1950s-1970s tract homes were built with original rigid metal ductwork whose joints and takeoffs separate over decades of Inland Empire thermal cycling, so a duct cleaning here often ends with us mechanically sealing and mastic-sealing runs rather than just vacuuming them.
• Abrasive Santa Ana grit eroding fresh sealant. After Santa Ana wind events, the fine grit and ash that settles into old return ducts is exactly what you see coating blower motors. We complete source removal and HEPA filtration before applying any mastic, because sealing over that abrasive layer guarantees failure.
• Crushed returns hidden behind air handlers. The flexible connectors near your furnace or air handler get compressed by storage, maintenance work, or simple age. We camera-inspect every return before we seal, because a crushed run reads as a leak on a pressure test but needs physical repair, not mastic.
• Disconnected takeoffs behind wall registers. The boot that connects your duct to the register can pull completely loose, especially in homes with original drywall that’s settled. We check every register with a borescope, not just the ones in easy reach.

Pricing for Duct Sealing in Highland, CA

We Also Serve Cities Near Highland

Our Inland Empire crews serve Highland homeowners directly, with fast scheduling to San Bernardino, Loma Linda, Redlands, and Mentone when capacity allows. Same standards, same written pricing, same 365-Day Done Right Promise.

FAQs About Duct Sealing in Highland