Actual EVS work

Bay Area HVAC service

Duct Repair & Ductwork Sealing in Santa Clara & the Bay Area

Professional duct repair, leak sealing, and airflow restoration for Bay Area homes. Fix hot and cold spots, reduce energy waste, and improve indoor air quality. Licensed and insured. Permits handled where required. Family-run.

Call (408) 300-8254 Get Free Estimate

CA Lic #1089826Licensed · Insured · Bonded1-2 Hour CallbackPermits Handled

Duct repair in Santa Clara and the Bay Area — EVS Mechanical repairs leaking, damaged, and undersized ductwork for homes with Carrier, Bryant, Goodman, Daikin, and Lennox HVAC systems. Every repair includes inspection, sealing, and airflow testing. Call (408) 300-8254 for a free estimate.

What Is Duct Repair?

Duct repair means fixing your home's ductwork — the network of metal, fiberglass, or flexible tubing that carries heated and cooled air from your HVAC system to each room. Over time, ducts develop leaks, come apart at seams, get crushed or kinked, or become clogged with debris. Duct repair restores proper airflow, improves system efficiency, and can lower your energy bills.

When to call about yours:

Some rooms are noticeably hotter or colder than others
Your energy bills are high and your HVAC system is relatively new
You can see visible damage to exposed ductwork in your attic or crawlspace
There's excessive dust or debris coming from your vents
Your system runs constantly but never seems to catch up
You hear whistling, rattling, or whooshing sounds from vents

Who this is for: Homeowners in Santa Clara, San Jose, Sunnyvale, Mountain View, Palo Alto, Los Gatos, Santa Cruz, Cupertino, Campbell, Saratoga, Los Altos, and Milpitas. Residential and light commercial.

What you get from an EVS install

Diagnosis before repair.

We don't guess where the problem is. We inspect the full duct run, measure airflow at each register, and use a pressure test to find leaks.

Permanent fixes, not tape jobs.

We use mastic sealant and metal-backed foil tape — not standard duct tape, which degrades within a year in attics.

Permits handled.

Some duct repairs require permits depending on scope. EVS handles the paperwork when needed.

1-2 hour callback.

Call (408) 300-8254. We call back within 2 hours.

Works with any system.

Carrier, Bryant, Goodman, Daikin, Lennox, or any other brand — duct repair isn't brand-specific.

Family-run.

Euler Vargas oversees every job. No subcontractors. No national call center.

Diagnosis before repair.

We don't guess where the problem is. We inspect the full duct run, measure airflow at each register, and use a pressure test to find leaks.

Permanent fixes, not tape jobs.

We use mastic sealant and metal-backed foil tape — not standard duct tape, which degrades within a year in attics.

Permits handled.

Some duct repairs require permits depending on scope. EVS handles the paperwork when needed.

1-2 hour callback.

Call (408) 300-8254. We call back within 2 hours.

Works with any system.

Carrier, Bryant, Goodman, Daikin, Lennox, or any other brand — duct repair isn't brand-specific.

Family-run.

Euler Vargas oversees every job. No subcontractors. No national call center.

From first call to finished job

Call or Book Online

Call (408) 300-8254. We call back within 2 hours. Tell us what you're experiencing — uneven temps, high bills, dust, or noise.

Diagnostic Inspection

We inspect all accessible ductwork — attic, crawlspace, basement, and wall chases where visible. We use a manometer to measure static pressure and identify leaks and restrictions.

Written Estimate

You get a written estimate with: what we found, what needs repair, the method (sealant, tape, section replacement), labor, and total price.

Repair Work

We seal all accessible leaks with mastic and metal-backed tape. Replace damaged sections where needed. Reattach disconnected joints. Secure sagging flex duct. Test airflow at registers after completion.

Final Testing + Walkthrough

We measure airflow at each register to confirm improvement. Walk you through what was fixed and how to monitor for future issues.

Call or Book Online

Call (408) 300-8254. We call back within 2 hours. Tell us what you're experiencing — uneven temps, high bills, dust, or noise.

Diagnostic Inspection

We inspect all accessible ductwork — attic, crawlspace, basement, and wall chases where visible. We use a manometer to measure static pressure and identify leaks and restrictions.

Written Estimate

You get a written estimate with: what we found, what needs repair, the method (sealant, tape, section replacement), labor, and total price.

Repair Work

Final Testing + Walkthrough

We measure airflow at each register to confirm improvement. Walk you through what was fixed and how to monitor for future issues.

Our Work

Real installs — our crew on every job

Gas furnace installed in closet alcove

Carrier outdoor condenser unit on pad

Bryant gas furnace in garage

TOSOT heat pump outdoor unit

Furnace on raised platform in utility closet

Air handler with insulated ductwork in attic

HVAC unit with ductwork in crawlspace

Furnace installation in garage

Garage HVAC system wide view

EVS technicians servicing a Lochinvar commercial rooftop unit

EVS technician working on commercial rooftop HVAC equipment

Two TOSOT heat pump units installed on a flat roof

New TOSOT heat pump installation on a flat roof

TOSOT inverter heat pump dual-fan condenser

TOSOT heat pump with EnergyGuide rating, rooftop install

TOSOT condenser unit secured on a flat roof

Completed rooftop heat pump installation, wide view

Air handler with new insulated ductwork installation

Pricing

Get an accurate quote

(408) 300-8254

Owner on every installNo subcontractorsFree estimates

Typical ranges for planning

Duct leak inspection + seal (minor)

Single leak or disconnected joint

Multiple leak repairs

Several seams, accessible attic/crawlspace

Flex duct replacement (per section)

Crushed or kinked flex duct

Full duct system seal

All accessible joints and seams in home

01 / 04

Service	What to expect
Duct leak inspection + seal (minor)	Single leak or disconnected joint
Multiple leak repairs	Several seams, accessible attic/crawlspace
Flex duct replacement (per section)	Crushed or kinked flex duct
Full duct system seal	All accessible joints and seams in home

Higher cost:

Limited access (crawlspace, tight attic), multiple stories, asbestos-wrapped old ducts (requires remediation before repair)

Lower cost:

Easy attic access, single-story, minor repair, bundled with new HVAC installation

Financing: Coming soon — call for current options.

Customer reviews

5.0

58 Google reviews

What EVS customers say

Real Google reviews from EVS jobs across the Bay Area.

“EVS Mechanical made what could have been a stressful process incredibly smooth. They diagnosed and repaired our HVAC system quickly and got everything running again. They didn't just do the work — they made sure we understood what was happening and why. Honest pricing. They didn't try to upsell us on things we didn't need. Really appreciated that they were on time and ready to work. If you need HVAC work done right, call EVS Mechanical. You won't be disappointed.”

Michael Cheung

HVAC repair · Bay Area

Verified

“The EVS Mechanical team were great! The EVS team showed up on time and completed the heat pump installation in one day as promised. Axel stayed on top of the whole process from quote to final inspection and communication was awesome. EVS made the whole process seamless. The pricing was more than fair for the quality of work we received. Every person on the crew was courteous and professional. When the installation was finished I couldn't tell they had been in the house. Thanks to EVS Mechanical we have heating and air conditioning again making for a comfortable house. I strongly recommend EVS Mechanical for all your HVAC needs.”

Scott Clark

Heat pump installation, one day · Bay Area

Verified

“Really impressed with EVS Mechanical. They earned every one of these five stars. The heat pump they installed has been incredibly efficient — our energy bills have actually dropped. Punctuality was great — they showed up exactly when they said they would. Appreciated how careful they were with our home during the installation. Would absolutely recommend EVS to anyone in the Bay Area. Thank you, EVS Mechanical, for the outstanding work!”

Nate

Heat pump installation · Bay Area

Verified

Read all 58 Google reviews

Before you decide

Clear language before a big decision.

Duct repair

Fixing a home's ductwork — the network of metal, fiberglass, or flexible tubing that carries heated and cooled air from an HVAC system to each room.

Frequently Asked Questions

Common signs: rooms that never reach the thermostat temperature, higher energy bills than expected, excessive dust from vents, whistling sounds, and your system running longer than it used to. EVS can confirm with a pressure test during a site visit.

Yes. Leaking ducts can waste 20-30% of conditioned air. Sealing them typically reduces HVAC runtime and energy consumption. Many homeowners see the repair pay for itself in 1-2 years through lower PG&E bills.

Minor repairs (1-2 leaks) take 1-2 hours. A full duct system seal takes 4-8 hours depending on home size and access.

Usually yes. Uneven temperatures are often caused by leaking ducts, disconnected ducts, or undersized branch runs. EVS diagnoses the root cause during inspection.

Yes. Duct repair isn't brand-specific. We work with any HVAC system — Carrier, Bryant, Goodman, Daikin, Lennox, or others. Ductwork connects to any brand the same way.

Minor duct repairs typically don't require permits. Major repairs or full replacement do. EVS handles permit determination during the inspection.

No. Standard duct tape degrades within a year in attic temperatures. EVS uses mastic sealant and UL-listed metal-backed foil tape for permanent repairs.

Yes. Leaking return ducts pull unfiltered air from your attic, crawlspace, or wall cavities into your HVAC system and distribute it throughout your home. Sealing these leaks keeps that air out.

Yes. If your ducts are clean but leaking, we repair them. If they have accumulated dust or debris, we recommend cleaning first, then repair if needed. Ask during your estimate.

Bay Area Specifics

Older Homes

Bay Area homes built before 1960 often have original ductwork — metal ducts that are still structurally sound but may have disconnected at joints or accumulated decades of debris. Many have no return ducts in bedrooms, which creates pressure imbalances.

Attic Ducts in South Bay Summers

Santa Clara, San Jose, Cupertino, and Saratoga summer attics can reach 130-150°F. Leaking ducts in these attics lose significant cooling capacity. Sealing attic ducts is one of the most cost-effective improvements for South Bay homes.

Crawlspace Ducts

Homes in Santa Cruz and the Los Gatos hills often have crawlspace ductwork. Moisture, pests, and insulation degradation are common issues. EVS evaluates crawlspace ducts carefully during inspections.

PG&E Connections

Leaking ducts force your HVAC system to run longer, increasing PG&E gas (winter) and electric (summer) bills. Duct repair typically pays for itself within 1-2 heating/cooling seasons in energy savings.