AC repair
Furnace & heating
Heat pumps
Ductless mini splits
Carrier
Trane
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 Daly City
Furnace repair in Daly City typically runs $150 – $700 depending on the part and the failure. Most no-heat calls in Daly City are diagnosed and fixed the same day, and we carry the common parts in our trucks so you’re not waiting on a warehouse. We know the housing stock here: Westlake ranchers, St. Francis Heights split-levels, Serramonte townhomes, and the mid-century attached homes that line the hills above Mission Street. Call (559) 245-8807 and a live person answers, day or night, not a phone tree.
What we run into most in Daly City is not the furnace itself but what the fog and the original install did to it. Moisture off the marine layer sits in crawl spaces and eats blower motor bearings. Ductwork run through slab foundations leaks air into the ground. And original gravity furnaces from the 1950s simply don’t move air the way a modern two-stage unit does. We diagnose for those local failure modes first, because that’s where your money should go.
Why Brandt HVAC Co San Francisco Is Daly City’s Preferred Furnace Repair Company
People in Daly City don’t want a stranger at the door. They want to know who’s coming, what it costs, and that the fix will hold. That’s exactly how we work. Every Furnace Repair in Daly City visit starts with a written price before any work begins. No estimate-later, no surprise line items. You see the number, you approve it, then we start.
Every technician is background-checked and identity-verified under the Threshold Verified standard. Before we arrive, you get the tech’s name and photo sent to you. At the door, they show you a photo ID badge. If someone you weren’t told to expect shows up, that visit is on us and we make it right. That’s the certainty people in Daly City tell us they can’t get from a no-name truck with a magnetic sign.
Devin Marlowe, who runs our operation, made that the rule from day one. His thinking is simple: a homeowner should never have to guess whether the person in the driveway is actually the person they called. Dispatcher phones are answered by a live person 24/7. Nights, weekends, holidays. When your furnace dies at 11 p.m. in the fog, you talk to a human who can route a truck to your street, not a voicemail box.
Styles & brands we work with
Furnace Maintenance in Daly City
Furnace maintenance in Daly City is not a formality. It’s the thing that catches fog-corrosion before it strands you without heat on a damp, 48-degree January night. Salt and moisture off the Pacific settle on control boards and blower motor shafts. Bearings rust. Capacitors weaken. A furnace that runs fine in October can fail in the first cold snap because nobody looked at it for three years.
A tune-up runs $80 – $200 and we do more than change a filter. We measure static pressure, check the heat exchanger for cracks, test the gas valve, and inspect the blower motor for rust and bearing play. You get a written report of what we found, with photos of anything that matters. We don’t sell you things you don’t need. Our technicians are not paid on what they sell, so the report is a list of facts, not a commission pitch.
Static pressure and why it matters here
Daly City homes often have undersized or leaky original ductwork. A new furnace that can’t breathe will short-cycle, overheat, and fail early. We check static pressure on every maintenance visit and tell you if your ducts are strangling your system.
Corrosion control for fog-belt homes
We clean and inspect blower motors for pitting and rust, check electrical connections for green fuzz, and test the flame sensor. Small things, but in a fog belt like Daly City they’re the difference between a furnace that runs ten years and one that quits in two.
Heat Pump Repair in Daly City
Heat pump repair in Daly City has a specific local wrinkle: the damp, salty marine air is rough on outdoor units and defrost sensors. Many homes east of the coastal hills don’t have central AC, but those that added heat pumps rely on them for both cool air during the occasional inland heat spike and warm air when the fog keeps daytime highs under 60. A defrost sensor caked in salt scale will throw the system into defrost at the wrong times and kill heating output.
Most heat pump repairs in Daly City run $200 – $500 for common fixes like defrost sensor replacement, refrigerant top-up, or reversing valve diagnosis. The unit sits in the salty air year-round, so coil corrosion is a real issue here. We stock common parts for Trane, Lennox, and Goodman heat pumps, so we’re usually done in one visit.
Defrost sensor failures
A bad defrost sensor reads the coil temperature wrong and the outdoor unit will ice over even when the air is above freezing. In Daly City’s damp air, that ice builds fast. We test the sensor’s resistance curve and replace it if it’s drifted out of spec.
Refrigerant leaks and fog corrosion
Salt air pinholes aluminum coils over time. A slow refigerant leak starves the heat pump of its ability to move heat, and your power bill climbs while the house gets colder. We pressure-test with nitrogen, find the leak, braze it, and recharge to the manufacturer’s exact charge weight.
Trusted Brands We Service in Daly City
We work on Trane, Lennox, Goodman, and Rheem furnaces most often in Daly City, and we stock the common parts for those brands right on the truck: igniters, flame sensors, gas valves, pressure switches, blower motors, and control boards. That matters when it’s 45 degrees out and you want the heat working today. We also service Carrier, Bryant, York, Daikin, and American Standard. A mid-century Daly City home usually has a furnace from one of three generations of installers, and we’ve seen all of them. You won’t wait on a parts run for the common failures.
See the difference
Before
After
Before
After
Before
AfterCommon Furnace Repair Problems We See in Daly City Homes
- Fog-corroded blower motors. Moisture from the daily marine layer finds its way into blower motor bearings and wiring. Intermittent no-heat calls that look like gas valve failures are often just a motor that’s rusted enough to bind on cold mornings.
- Slab-ducted airflow leaks. Original mid-century ductwork cast into slab foundations leaks conditioned air into the ground. Even a new high-efficiency furnace won’t hold temperature if the ducts are bleeding air, so we test and seal before we sell you a bigger box.
- Undersized electrical panels. Older attached single-family homes in Daly City often have full breaker panels. A rushed furnace replacement can overload circuits when a high-static-pressure blower motor starts up. We check panel load before we install.
- Cracked heat exchangers in original gravity furnaces. Westlake homes from the 1950s still run original gravity furnaces in surprising numbers. Twenty-plus years of thermal cycling plus damp intake air cracks heat exchangers, and that’s a carbon monoxide risk, not just a comfort problem.
Pricing for Furnace Repair in Daly City, CA
Furnace repair in Daly City ranges from $150 to $700 for most jobs. A simple capacitor replacement or flame sensor cleaning lands at the low end. A blower motor replacement, especially on a fog-exposed unit with a corroded shaft, lands at the high end. The difference is parts cost and how much disassembly the job takes.
| Repair | Typical Daly City Price |
|---|---|
| Furnace repair diagnostic + capacitor replacement | $150 – $400 |
| Blower motor replacement (fog-corrosion) | $300 – $650 |
| Heat pump defrost sensor & refrigerant top-up | $200 – $500 |
| Furnace tune-up with static pressure check | $80 – $200 |
Those are the numbers you’d see on a written proposal before any work starts. The estimate is free, and it’s not a “starting at” number. It’s the price. If we find something else while we’re in there, we stop and bring you a new written number before we touch anything else. Call (559) 245-8807 to set up a visit.
We Also Serve Cities Near Daly City
Our Daly City crews also run calls to South San Francisco, San Bruno, Pacifica, and San Francisco. If you’re just over a city line, the same live-dispatch phone number works and the same written-price rule applies. No separate office, no different policy.
Serving Daly City, CA - Our Local Coverage Area
We’re based in the Daly 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 Daly City
Yes, and it usually points to a dirty flame sensor or a blower motor bearing that’s rusting from fog moisture. The flame sensor gets a film on it from the damp combustion air, and the furnace shuts off a few minutes after lighting because it can’t confirm the flame is lit. A blower motor with corroded bearings draws high amps, overheats, and trips the limit switch. Both are common in Daly City homes near the coast. We test the sensor in seconds and check motor amp draw before we replace a single part. Call (559) 245-8807 and we’ll diagnose it on the first visit.
Usually not. Most Daly City homes built in the 1940s through the 1960s have single-zone systems with ductwork that was never balanced for the floor plan. The first floor is cold because the ducts leak into the slab and the register runs are too long, not because the furnace is too small. We check static pressure and do a room-by-room airflow balance before we recommend anything. A correctly sized furnace with sealed ducts will hold temperature better than an oversized one that short-cycles. We’ll show you the numbers before we ask for a dime.
Yes, but it is not a like-for-like swap. Original Westlake gravity furnaces move warm air by convection through oversized ducts cast into the slab. A modern heat pump needs a blower that can push against the static pressure of those old ducts, and some are too leaky or too small to get decent efficiency. We can rework the supply plenum to fit the existing floor registers and keep the slab untouched, and we’ll measure static pressure and airflow before we commit to a plan. That’s exactly the retrofit we did near Westlake Park last January, and it held 70°F through the fog season.
Stale, damp air is sitting in the ductwork or the filter box and getting circulated every time the blower runs. In Daly City’s fog belt, outdoor humidity can sit at 90% for days, and if the ducts are in a crawl space with no vapor barrier, they stay damp. The smell is usually mold or mildew on the blower wheel or in the return duct. We’ll pull the blower housing, clean the wheel, check the condensate path, and tell you if the ductwork itself needs a cleaning or a vapor barrier in the crawl space. It’s a common fix, and the smell should not come back if the moisture source is addressed.
Yes, and we’ll do a panel load check first. A modern high-efficiency furnace typically draws less gas but can pull more motor amps at startup, especially if the old ductwork is restrictive and static pressure runs high. If the panel is full, we can often free up a circuit by combining old lighting circuits, or we can specify a tandem breaker where the panel allows. We’ll tell you the electrical work cost in writing before the furnace project begins. We never oversubscribe a panel or cut corners on a startup circuit; we’d rather add a subpanel than create a fire hazard. Call (559) 245-8807 for a no-cost assessment.
Dispatch and scheduling are coordinated from our San Francisco Bay Area office, but the trucks and the technicians you’ll see in Daly City are local crews who know the Westlake and St. Francis neighborhoods, the slab-ducted ranchers, and the fog belt’s particular grudge against HVAC equipment.
Written by Devin Marlowe, Owner at Brandt HVAC Co San Francisco, serving Daly City furnace repair calls with written pricing and the 365-Day Done Right Promise since 2003.