AC repair
Furnace & heating
Heat pumps
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Carrier
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GoodmanSeasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
Get your free estimateFast, Reliable Furnace Repair Across Foster City
Furnace repair in Foster City typically runs $150 – $700, and most no-heat calls are diagnosed and fixed the same day. If your furnace quits on a foggy morning or after a fall storm, you want someone who knows the lagoon-side homes, the 1970s Rheem and Goodman units still chugging along, and why salt air eats capacitors faster here than five miles inland. Our Furnace Repair team serves Foster City with techs who arrive in uniform, show photo ID at the door, and hand you a written price before a single tool comes out. Call (559) 245-8807 and a live person answers, day or night.
Why Brandt HVAC Co San Francisco Is Foster City’s Preferred Furnace Repair Company
Foster City homeowners call us because we tell them exactly who is walking through their door. Before any visit, you get the technician’s name and photo. At the door, they show a photo ID badge. That’s the Threshold Verified standard, and it matters in a city where many residents are home alone, working from home, or raising young kids. If someone arrives who you weren’t told to expect, that visit is on us.
We answer the phone with a live person 24 hours a day, seven days a week. No voicemail tree, no callback queue. When a furnace dies at 11 p.m. near Sea Cloud Park, you talk to a human who can dispatch a tech to Foster City fast. Our techs know the housing stock here: 1960s and 1970s single-family homes and townhouses with original ductwork, low-pitch roofs, and furnaces that have seen decades of bay air. That local knowledge means we show up with the right parts on the truck more often than not.
Every repair we do, from an ignitor swap to a full heat exchanger replacement, comes with a written guarantee, and it’s covered by the 365-Day Done Right Promise. If the repair fails within the guarantee period, we return at no charge. No argument.
Styles & brands we work with
Heating Repair in Foster City
Heating Repair in Foster City means getting a furnace, boiler, or heat pump producing warm air again, and it costs $150 – $700 for most residential jobs. Foster City’s marine layer means heating systems run more than you might think: cool, damp evenings reach into April and return by October. When a system won’t fire or a blower won’t spin, it’s not just uncomfortable, it’s a race against fog-damp walls and cold floors in slab-built homes.
What Our Techs Check First
Our team starts with the safety switches and the condensate path. Foster City units near the lagoons collect wind-driven salt and bay debris, and a clogged condensate drain will trip the safety switch and kill the furnace on exactly the kind of foggy morning you need it most. From there, we test ignition, gas valve operation, and the blower motor under load.
Townhouse and Single-Family Furnace Repair
Townhouse furnace closets in compounds like The Islands or Windward are tight, with shared venting and little tolerance for improper repairs. Older single-family homes off Edgewater Boulevard and Beach Park Boulevard often have furnaces in garages where salt air drifts in. We carry corrosion-resistant fittings and stock common Goodman, Rheem, York, and Daikin parts locally to turn most Foster City repairs around in a single visit.
Boiler Repair in Foster City
Boiler Repair in Foster City is less common than furnace work, but when a boiler fails in an older townhouse with baseboard radiators, it’s urgent. Most boiler repairs in Foster City fall in the $150 – $700 range, and the work usually involves the circulator pump, the gas valve, the expansion tank, or the controls that tell the boiler when to fire. Lagoon moisture is rough on boiler wiring and pressure switches, and we see a steady stream of calls from homes near the levee after fall storms.
Lagoonside Corrosion in Boiler Systems
Because Foster City sits just feet above the water table, boiler condensate and venting setups are often exposed to more ambient moisture than you’d find in Belmont or San Mateo. Backflow prevention and corrosion checks are part of every boiler repair we do here. We will not simply swap a part and leave; we inspect the pressure relief path and confirm the condensate neutralizer is doing its job.
Signs a Foster City Boiler Needs Immediate Repair
Listen for banging or gurgling in the radiators, look for water pooling under the boiler or leaking from the relief valve, and pay attention to a pilot that won’t stay lit. Any one of those is a call to (559) 245-8807. We’ll give you a straight diagnosis and a written price before any work begins.
Trusted Brands We Service in Foster City
We service, repair, and maintain all major residential furnace brands, including Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. In Foster City, the most common units we see are 1970s and 1980s Rheem and Goodman furnaces, often with original blower motors and controls. We stock common replacement parts for these older systems, and when an obsolete part has to be sourced, we’ll tell you exactly what that means for the timeline and the total cost. For Foster City customers, that means less waiting and fewer return trips.
See the difference
Before
After
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After
Before
AfterCommon Furnace Repair Problems We See in Foster City Homes
- Condensate safety switch trips after heavy fog. Wind-driven salt and bay debris clog the drain line, the switch trips, and the furnace won’t light. We flush the line, test the switch, and add a corrosion-resistant trap where the existing one has failed.
- Control boards fried by fall storm surges. High-wind events near the levee knock out power or send surges through older panels. Dead thermostats and silent control boards spike every season. We check voltage, ground path, and surge protection as part of the diagnosis.
- Rusted blower motors and corroded capacitors from salt air. Units in garages or crawlspaces near the lagoons fail faster than inland units. Our tech traced a no-heat call on Beach Park Boulevard to a corroded blower motor capacitor in a 1970s Rheem furnace. The salt air off the lagoon had eaten the terminals, and the homeowner was two days from a frozen pipe. We replaced the capacitor, checked the heat exchanger for rust bloom, and confirmed proper venting before the first cold snap.
- Flooded crawlspaces causing shorted wiring in townhouse furnaces. When lagoon overtopping or heavy rain gets into a crawlspace, blower motors rust and wiring shorts. Do not restart a furnace that has been submerged. We inspect, dry, and replace damaged components before attempting a start.
Pricing for Furnace Repair in Foster City, CA
Most furnace repairs in Foster City cost between $150 and $700, parts and labor included. A simple ignitor replacement runs $150 – $300. A blower motor replacement typically lands between $350 and $700. A gas valve repair or heat exchanger inspection sits in the middle of that range. What pushes a repair toward the upper end is not time spent, it’s the cost of the component and whether the furnace has been exposed to lagoon moisture or flood damage. We give you a written price before any work starts, and that number does not change at the end of the job. No exceptions.
| Service | Typical Price Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Heating Repair | $150 – $700 |
| Boiler Repair | $150 – $700 |
Estimates are free. Call (559) 245-8807 and tell us what you’re hearing, seeing, or smelling. We’ll give you an honest range over the phone and schedule a visit.
We Also Serve Cities Near Foster City
Beyond Foster City, our techs regularly serve homeowners in San Francisco, Oakland, Hayward, and Vallejo. The same written-price guarantee, background-checked technicians, and 365-Day Done Right Promise apply in every city we cover. If you are just outside Foster City, call (559) 245-8807 to confirm service in your neighborhood.
Serving Foster City, CA - Our Local Coverage Area
We’re based in the Foster City 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 Furnace Repair in Foster City
The safety switch trips because your condensate drain is clogged with wind-driven salt and bay debris, and the furnace shuts down to protect itself from water backing up into the unit. In Foster City, this is the single most common no-heat call on foggy mornings. The fix is usually a drain flush and, in many lagoon-adjacent homes, replacement of a corroded trap. Call (559) 245-8807 and we’ll clear it and confirm the switch resets properly.
Do not keep cycling the switch. A blower that hums but won’t spin usually points to a failed blower motor capacitor, which fails often in Foster City after storm-driven power surges or from salt-air corrosion. Turn the furnace off at the thermostat and the service switch, then call us. Continuing to reset it can overheat the motor and turn a $200 capacitor replacement into a $600 motor job.
Very possibly yes. Foster City’s engineered lagoon system keeps the water table high and the air humid, and salt spray accelerates rust on heat exchangers, especially in townhouse units near the levee. Rust spots can be cosmetic or they can mean cracks, which is a carbon monoxide risk. We inspect the exchanger with a camera and a combustion analyzer, and we’ll tell you honestly if it’s safe or if replacement is required. That inspection is part of any repair visit.
You can run a furnace on a properly sized portable generator only if the furnace is disconnected from the house panel and connected through a transfer switch or a generator inlet box. Do not backfeed a panel with a double-male cord. That’s dangerous to you and to line workers. For Foster City outages near the levee, we recommend a generator interlock and a surge protector on the furnace circuit. Call (559) 245-8807 if you want us to check your setup before the next storm.
No. A scraping blower after flooding means the motor bearings or the blower wheel are damaged, and running it risks motor burnout or electrical shorting. Water in a crawlspace from lagoon overtopping also rusts wiring and circuit boards. Shut the system off at the thermostat and the service switch, and call us. We’ll dry the area, inspect the motor and wiring, and show you what needs replacement before restarting.
Written by Devin Marlowe, Owner at Brandt HVAC Co San Francisco, serving Foster City and the surrounding Bay Area.