Duct Repair
Sealing and repair of damaged or leaky ductwork Professional service throughout the San Francisco Peninsula with same-day appointments available.
Direct answer
For duct repair, start with a real diagnosis of the system, controls, airflow, and visible equipment condition. The visit should produce clear next steps: repair, maintenance, replacement planning, or no immediate work if the system is operating correctly.
We schedule duct repair across the San Francisco Peninsula with same-day appointments and 24/7 phone support. To book a visit or get a diagnosis, call (650) 396-3290.
About Our Duct Repair Service
Leaky ductwork is one of the most overlooked causes of HVAC inefficiency and comfort problems. Studies show that typical homes lose 20-30% of conditioned air through duct leaks before it ever reaches living spaces. Duct repair and sealing can dramatically improve your comfort while reducing energy waste.
Signs of duct problems include rooms that are always too hot or cold, excessive dust in certain areas, whistling sounds from vents, and higher-than-expected energy bills. If you've noticed any of these issues, your ductwork may need attention.
Our duct repair process starts with a thorough inspection, often including pressure testing to measure exactly how much air your system is losing. We check accessible ductwork in attics, crawlspaces, and basements for disconnections, holes, crushed sections, and deteriorated insulation. We also inspect duct connections at registers and at the air handler or furnace, where leaks are common.
Repair methods depend on the type and severity of damage. Minor leaks at joints and connections are sealed with professional-grade mastic or metal tape (not duct tape, which fails over time). Larger holes or damaged sections may require patching or replacement. Flexible duct that has become kinked or crushed may need to be rerouted or replaced to restore proper airflow.
Many Peninsula homes were built in the 1950s-70s with ductwork that's now 50+ years old. This older ductwork often has multiple leaks and may be undersized for modern HVAC equipment. While full duct replacement is sometimes necessary, we often achieve significant improvements through targeted sealing and repair at a fraction of the cost.
How We Think Through Duct Repair
System behavior
We look at when the issue happens: startup, long run cycles, shutdown, or only during the hottest or coldest part of the day.
Airflow path
Filters, returns, supply vents, blower operation, and duct restrictions can create symptoms that look like equipment failure.
Control response
Thermostat calls, low-voltage wiring, safeties, boards, and relays are checked before major equipment is blamed.
Equipment condition
Age, service access, corrosion, prior repairs, and part availability shape whether a repair is practical.
Repair, Maintain, or Replace?
Repair first when the failure is isolated
A failed common part, dirty coil, drain issue, or control fault is usually a repair conversation before it is a replacement conversation.
Discuss replacement when the system is compounding failures
Repeated breakdowns, poor airflow, obsolete parts, refrigerant constraints, or comfort problems across the home can change the economics.
Do not size equipment by guesswork
For installation or replacement, load, ductwork, room comfort, and equipment placement matter more than simply matching the old unit.
Signs You Need Duct Repair
Our Duct Repair Process
Duct system inspection
Pressure testing
Identify leaks and damage
Seal connections
Repair or replace sections
Verify airflow improvement
Duct Repair Cost Factors
Safe Checks Before You Book
Check the thermostat mode
Confirm heat/cool mode, fan setting, batteries, schedule, and whether the display is responding.
Check airflow basics
Replace a dirty filter, open supply vents, and make sure return grilles are not blocked by furniture.
Look at outdoor equipment safely
Clear leaves or debris around the condenser, but do not open panels or touch electrical components.
Do not open electrical panels, bypass safeties, vent refrigerant, or keep running equipment that smells hot, leaks water, or repeatedly trips protection.
Duct Repair Service Areas
We provide duct repair throughout the Peninsula
Duct Repair FAQ
Duct Repair costs vary based on system type, access, parts, and whether the work is a repair, tune-up, or installation plan. You should receive a clear diagnosis and approved option before work begins.
Ready for Duct Repair?
Schedule your appointment today. Clear pricing, no surprises.
24/7 Phone Support, Technicians 8am-8pm Daily