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 Calistoga
Last August, a crew from our San Francisco Bay Area office drove up Highway 128 to a ranch-style home off Lincoln Avenue. The homeowner had run her AC nonstop through three weeks of wildfire haze, and the supply vents were blowing 30% less air than the return grilles were pulling. The culprit wasn’t the compressor or the filter. It was a web of gaps in the original flexible ductwork, installed in 1978, that had never been sealed properly and had slowly peeled apart at every joint. We sealed it with mastic and mesh, ran a post-test, and her static pressure dropped from 0.9 to 0.45 inches. She paid one flat price we wrote down before we touched anything.
Duct sealing in Calistoga typically runs $850 – $2,400 for a whole-house seal, depending on system size and access. Most jobs finish in a single day, and we test before and after so you see the difference in hard numbers.
We know Calistoga’s housing stock because we’ve worked in it. The Victorians near downtown, the 1960s cottages off Foothill Boulevard, the mobile home parks on the east side. Each has its own duct problems, and each gets the same standard: arrive inside the window, price in writing, leave the site clean. If you’re seeing uneven temperatures, dust that returns within days of cleaning, or utility bills that climb every fire season, your ducts are likely leaking conditioned air into your attic or crawl space. Call (361) 326-5060. Estimates are free, and we answer live.
Why Hollis Air Duct Cleaning Is Calistoga’s Preferred Duct Sealing Company
We’ve been sending crews to Calistoga since we opened our Bay Area scheduling office, and the pattern is consistent. Homeowners here don’t want a hard sell. They want someone who knows that a home on Tubbs Lane faces different air quality stress than one in the Silverado Highlands, and who prices the job before the van doors open.
Our Duct Sealing in Calistoga work is backed by the same 365-Day Done Right Promise we offer everywhere: if the seal fails within a year, we return and make it right at no charge, including a free second visit. No negotiation, no paperwork fight. The price is written down before any work starts, and it does not move at the door.
Our technicians are background-checked and uniformed. You know who’s arriving before they knock. Phones are answered by a live person 24 hours a day, 7 days a week, no voicemail loops. That’s The Garrison Standard, and it’s how every Hollis location operates, including ours serving Calistoga.
Duct Insulation in Calistoga
Duct Insulation in Calistoga addresses a specific problem created by this city’s extreme diurnal temperature swings. During summer, attic temperatures can hit 140°F while your ducts carry 55°F conditioned air. Uninsulated or poorly insulated ductwork bleeds that temperature difference into dead loss, forcing your compressor to run longer and harder, especially during fire season when you’re already filtering particulate-heavy air.
We insulate using foil-faced fiberglass wrap or closed-cell foam, depending on access and existing duct condition. Typical duct insulation in Calistoga runs $1,200 – $2,800 for a full system, with smaller partial jobs starting around $650. Every quote is written and agreed before work begins.
When Insulation Matters More Than Sealing Alone
Some Calistoga homes, particularly the mid-century ranch styles off Petrified Forest Road, have ducts that are structurally sound but thermally naked. Sealing gaps helps, but without insulation, you’re still paying to cool your attic. We test surface temperature and R-value to tell you which problem is costing you more.
Fire-Season Load and Insulation Stress
The 40°F+ day-night swings in Calistoga put unique thermal cycling stress on duct materials. Flexible duct liners crack faster here than in coastal zones. Our insulation work includes inspecting for that fatigue, because wrapping a cracked duct traps moisture and makes things worse.
HVAC Duct Sealing in Calistoga
HVAC Duct Sealing in Calistoga is the process of closing leaks in your forced-air system’s supply and return pathways using mastic sealant, fiberglass mesh, and mechanical fasteners, then verifying the result with a duct blaster or pressure pan test. In a town where summers hit 100°F and wildfire smoke can linger for weeks, every cubic foot of conditioned air that escapes into your attic is air you’re paying to create twice.
Typical HVAC duct sealing in Calistoga costs $850 – $2,400 for residential systems. Mobile homes and compact cottages often fall at the lower end; multi-zone systems in larger hillside homes run higher. We price by system complexity and linear footage of ductwork, never by the vent.
The Mastic Method vs. Tape Shortcuts
Some crews use foil tape and call it sealed. Tape fails in Calistoga’s attic heat within three to five years. We brush on water-based duct mastic, reinforced with mesh at joints and connections, then let it cure to a flexible, permanent seal. It’s slower. It lasts.
Post-Seal Verification
Every HVAC duct sealing job we complete includes a pressure test after the work. You get the before and after numbers in writing. If we can’t demonstrate improvement, we don’t charge for the seal. That’s part of our 365-Day Done Right Promise.
Trusted Brands We Service in Calistoga
Our equipment roster includes Nikro negative-air machines and filtration products from Honeywell and Aprilaire. We don’t just install these brands; we stock common components so Calistoga homeowners aren’t waiting a week for a filter housing or a replacement media pad. For duct sealing specifically, we use professional-grade mastic and mesh from Abatement Technologies, the same supplies commercial HVAC contractors specify for hospital and school jobs. When your system needs filtration upgrades after a seal, we size Aprilaire media cleaners and Honeywell electronic air cleaners to the actual airflow your newly sealed ducts will deliver, not the guesswork from before.
Common Duct Sealing Problems We See in Calistoga Homes
- Original galvanized steel ducts in pre-1960 Victorians. These systems were joined with snap-lock seams and no sealant. Decades of thermal cycling have opened gaps at every joint, and the metal itself is often coated with residue from old oil furnaces that makes new mastic adhesion tricky without proper prep.
- Flexible ductwork in 1970s tract homes and mobile home parks. The east-side developments used standard flex duct with plastic liners that grow brittle in Calistoga’s attic heat. We often find entire runs where the inner liner has separated from the insulation, blowing conditioned air into the fiberglass wrap instead of the room.
- Return-air plenum leaks after fire season. In homes west of town, near the wildland-urban interface, ash and char bypass standard filters and accumulate on the evaporator coil and in the return plenum. That buildup corrodes metal and degrades seals. Our Air Duct Cleaning in Calistoga crews see this regularly, and sealing without cleaning first wastes your money.
- Pest intrusion in crawl space and basement ducts. Calistoga’s winter rains drive rodents and insects into sheltered spaces. We’ve pulled out nests from disconnected duct boots in homes near the Napa River floodplain, where humidity also degrades tape adhesives faster than in drier parts of town.
Pricing for Duct Sealing in Calistoga, CA
Whole-house duct sealing in Calistoga typically runs $850 – $2,400. A small single-zone system in a cottage or mobile home usually falls between $850 and $1,400. Larger homes with multiple zones, extensive flex duct in attics, or hard-to-access crawl spaces run $1,800 – $2,400. Partial sealing of a single problem zone starts around $450.
What moves the number: linear footage of ductwork, number of connections and boots to seal, attic or crawl space accessibility, and whether we need to remove old failed tape or repair disconnected sections first. We don’t quote per-vent pricing, and we don’t bait with a low teaser that jumps once we’re inside. The price is written down before any work starts, and it does not move at the door.
Every estimate is free. We test, we explain what we found, we give you a written number, and you decide. Call (361) 326-5060 to schedule.
We Also Serve Cities Near Calistoga
Our crews work throughout the northern Napa and southern Sonoma county line. We regularly handle Duct Sealing calls from Calistoga homeowners and neighbors in Windsor, Santa Rosa, Healdsburg, and Rohnert Park. Same standards, same written pricing, same 365-Day Done Right Promise at every stop. We also handle Dryer Vent Cleaning in Calistoga for homeowners who want their full ventilation system checked in one visit.
Serving Calistoga, CA - Our Local Coverage Area
We’re based in the Calistoga 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 Calistoga
Duct sealing in Calistoga runs about the same as Napa, typically 5 – 10% less than Santa Rosa due to shorter drive times from our Bay Area dispatch. Most Calistoga whole-house jobs fall in the $850 – $2,400 range. Call (361) 326-5060 for an exact quote on your system, estimates are free.
Yes, we work in every Calistoga neighborhood, from downtown Victorians to the Silverado Highlands and the rural properties off Tubbs Lane. Hill homes often have longer duct runs and more complex zoning, which we account for in the written quote before we start.
We typically schedule Calistoga appointments within three to five business days, with flexibility for homeowners dealing with post-wildfire air quality concerns. Our San Francisco Bay Area office coordinates dispatch, and crews carry the equipment to complete most seals in a single visit.
We don’t classify duct sealing as an emergency service, but our phones are answered by a live person 24/7, and we will expedite scheduling if your system has failed completely or you’re dealing with active smoke infiltration through duct leaks. Call (361) 326-5060 and we’ll get you on the calendar as fast as possible.
If any sealed joint fails, separates, or shows measurable leakage within one year of our work, Hollis returns and makes it right at no charge, including a free second visit. The guarantee is in writing on every job, not a verbal assurance. We fix it because The Garrison Standard says we finish what we start.
Written by Roy Castellanos, Owner at Hollis Air Duct Cleaning, serving Calistoga since 2004 as part of the Garrison Partners family.