Air Duct Repair in San Mateo - Tested First, Written Price Second

Trusted Air Duct Repair for San Mateo Homeowners

Leaking, crushed, or disconnected ductwork quietly drains the comfort out of a San Mateo home. The air handler runs longer, some rooms never get warm, and dust keeps settling on the same shelves no matter how often you clean. We repair ductwork as a standalone service, so a tear found during a cleaning gets fixed instead of noted. Our technicians have up to 10 years of experience, and we use Rotobrush rotary cleaning and Nikro HEPA containment so the work is contained and verified, not just sprayed and sealed. We work same-day when the schedule allows. Licensed and insured, with one flat price per system agreed before any work starts. Call (866) 894-2153.

Call (866) 894-2153

HVAC Duct Installation

HVAC Duct Installation is the work of running a new duct system for a home that never had one, or replacing layout that was sized wrong from the start. Homeowners call us for it when an addition goes on, when a remodeler exposes the old path, or when a previous system was installed for a different floor plan and has never delivered balanced air. We survey the existing runs, plan the trunk and branch layout, and install sheet metal and flexible duct sized to the equipment you actually have. A typical HVAC duct installation in San Mateo runs $2,400-$7,500 depending on home size and run count, with the written estimate setting the final price.

Planning the Duct Layout

We start from room-by-room air needs, not from where old duct already sits. That determines trunk size, branch spacing, and where the returns belong. Getting this right before anything is cut is the difference between even airflow and a house with one hot room.

Working With Your Existing Equipment

New duct has to match the air handler’s capacity and the static pressure it can push against. We measure both before install so the finished system isn’t starved or oversized. It’s a small step that saves a lot of balancing later.

Air Duct Replacement

Air Duct Replacement is the removal of failed ductwork and the fitting of new duct in the same path, done when the old material is beyond repair. Most homeowners reach this point when the ducts are contaminated or crumbling, or when the insulation has come off the flex duct and the run is no longer airtight. We remove the old material, contain the work with Abatement Technologies negative-air equipment where contamination is present, and install duct rated for its location. A typical air duct replacement in San Mateo runs $1,800-$5,600 depending on how many runs are involved and how accessible the attic and crawl path is. The written estimate sets the final price.

When Replacement Beats Repair

If the duct runs are brittle, collapsing at the joints, or coated with material that won’t brush out, replacement is the safer call. We tell you which side of that line you’re on after inspection, not before it.

Choosing Duct Material

Flex duct is fast and flexible; rigid sheet metal lasts longer and holds shape better. We recommend based on the run’s location and how much movement the space sees, not on what’s easiest to install.

Ductwork Repair

Ductwork Repair is the correction of damage in a duct system that still has life left in it, and it’s the most common job we’re called out for. Tape fails, joints pull apart, a rodent chews through a flex run, or someone steps through the attic ductwork while retrieving a box. We inspect every accessible run, seal the joints and boots with mastic where the material allows, reconnect and re-support sagging duct, and confirm airflow after. A typical ductwork repair in San Mateo runs $350-$1,400 depending on how many leaks and how hard they are to reach. The written estimate sets the final price.

Sealing Leaky Joints

A leaking joint can pull in attic air, crawl dust, or insulation fibers. We seal with mastic rather than relying on duct tape alone, which dries out and fails. Sealing tight is the single highest-return repair in most systems.

Reconnecting and Re-supporting

Sagging duct restricts airflow and catches debris. We re-hang and support runs so they hold their shape. A duct that sits flat on the joists is a duct that’s already halfway to failing.

Duct Replacement

Duct Replacement is the section-level swap of failed duct material rather than the whole system, and it’s what we reach for when most of the network is sound but one or two branches are shot. We see it when a single run has torn loose in a tight attic corner or when rigid duct has rusted through at a low point. We isolate the affected section, remove it, and install new duct matched to the rest of the system. A typical duct replacement in San Mateo runs $600-$2,200 depending on the length of the failed section and its location. The written estimate sets the final price.

Partial vs. Full Replacement

If three runs out of twelve are beyond saving, replacing just those is the honest call. We’d rather tell you that than push a whole-system job you don’t need. The inspection makes the decision, not a sales target.

Matching New Duct to Old

New sections need to meet the same size and material as the existing network or you’ll get a flow imbalance. We measure before we install. Mismatched duct is a common cause of one room never heating right.

Ductwork Installation

Ductwork Installation is the fitting of new duct into a system that was never fully ducted, or into a home where the routing has to change because of a remodel. It comes up when a homeowner adds a room to the conditioned space or when the existing path was never completed properly and one room has always run hot or cold. We handle the intake and return placement, run the duct, and check flow before we leave. A typical ductwork installation in San Mateo runs $900-$3,400 depending on the number of runs and how much attic or crawl space is available. The written estimate sets the final price.

Adding Runs to an Existing System

Adding a run means the existing trunk has to have capacity to spare. We check static pressure before we cut in, so the rest of the house doesn’t lose airflow. A simple step that prevents a follow-up call.

Return Air Design

Return air is the half of the system most people ignore. Undersized returns starve the air handler and make the whole system noisy. We size them to match supply, not as an afterthought.

Brands We Service

We run professional-grade Rotobrush rotary cleaning equipment because there’s no substitute for mechanical agitation on duct walls. We contain dislodged debris with Nikro HEPA negative-air units, so what’s released gets captured rather than blown into the house. Where contamination is present, we bring Abatement Technologies equipment to the job.

On the air-quality side, we work with Honeywell, Aprilaire, and Guardsman filtration and humidity components, and we’re familiar with how each wears and where it needs replacing. We’re not a dealer for any of these, and we don’t stock OEM parts. Whether you have an Aprilaire filter cabinet or any other make, we can help.

Signs You Need a Pro Right Now

• Dust on every surface, no matter how often you clean. Visible dust settling right after cleaning usually means leaks pulling in attic or crawl dust. It won’t stop until the leak is sealed.
• A room that never gets the same air as the rest. One consistently hot or cold room usually traces back to a crushed or disconnected run. Airflow testing confirms which one.
• Rattling or whistling when the system runs. That sound is often a loose joint or an undersized run. Left alone, it works the blower harder than it needs to.
• Higher utility bills with no other explanation. Leaking duct means heated or cooled air never reaches the room it’s meant for. The extra cost is invisible until you compare the bill.
• Visible tear, crush, or nesting material on the duct. Rodents and age both damage flex duct. If you can see the damage, airflow in that run is already restricted. Call (866) 894-2153 to get it inspected.

Our Process, Step by Step

1. 1
   Inspection and photos. We walk every accessible run, take before photos of what we find, and document the leaks, tears, or crushed runs. You see the same photos we do.
2. 2
   Airflow and static pressure check. We measure return-side pressure and supply airflow so we know if the system is starved or fighting its own duct. This tells us whether a repair is enough or the layout is the problem.
3. 3
   Written estimate. One flat price per system, agreed before any work starts. No per-vent pricing and no surprise line items. The written estimate sets the final price.
4. 4
   Repair or replacement with containment. We seal, reconnect, or replace as agreed, containing dislodged debris with Nikro HEPA negative air. Nothing gets redistributed into the house.
5. 5
   Post-repair verification. We re-check airflow, take after photos of the completed work, and walk you through what changed. You leave with a record of the job.

How Much Does Air Duct Repair Cost in San Mateo?

Our Service Area Near San Mateo

We repair and install ductwork across San Mateo and the surrounding mid-Peninsula, including Montara, West Menlo Park, Moss Beach, Hillsborough, Foster City, Belmont, Burlingame, Millbrae, and Redwood City. Response time depends on the day’s schedule; same-day slots open when dispatch has room. If you’re outside this list, call and we’ll tell you whether we reach you.

Frequently Asked Questions About Air Duct Repair in San Mateo

Schedule Your Air Duct Repair Service in San Mateo Today

If a room won’t heat, dust keeps settling, or you’ve seen damage on the duct, get it looked at before it works the system harder. Call (866) 894-2153. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. Licensed and insured, one flat price per system agreed before work starts, and before-and-after photos so you know the job was done. Estimates are free and no-obligation.

Written by the team at Duct Cleaning San Mateo.