Furnace & heating
AC repair
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 Redwood City
Furnace repair in Redwood City typically costs between $150 and $700 depending on the failed part, and most no-heat calls can be diagnosed and fixed in a single visit. We run calls all over the Peninsula side of the bay, from the flats near El Camino Real up into the hills off Edgewood Road and Farm Hill, so we know how differently a furnace behaves in a foggy 1940s bungalow versus a mid-century ranch above the marine layer. When your heat quits on a cold January night, call (669) 800-4179 and a live person picks up, not a voicemail tree.
Why Cold Harbour Heating and Air San Jose Is Redwood City’s Preferred Furnace Repair Company
We are an independently owned and operated member of the Kingswell network, founded in 2003 and built around a set of written standards most contractors never put on paper. Before any tool comes out, you get a written price for the repair. Not a range. Not an estimate that changes at the door. A firm number, handed to you in writing, every time. That is the Kingswell Way, and it has been since day one.
Our 365-Day Done Right Promise covers every furnace repair we do in Redwood City. If the same repair fails inside a full year, we come back and correct it at no charge. No argument, no pro-rated deductible, no fine print. Victor Mancini has built our reputation on that guarantee, and every tech who walks through your door is background-checked, uniformed, and trained on nine major residential brands including Carrier, Trane, Lennox, and Goodman.
Redwood City homeowners call us back because we show up when we say we will, leave the furnace closet cleaner than we found it, and answer the phone around the clock. That matters when your furnace dies at 11 p.m. and the house is dropping toward 50 degrees.
Styles & brands we work with
Heating Repair in Redwood City
Heating repair in Redwood City runs $150 to $700 for most component-level fixes, and the work usually involves diagnosing why the system is not producing or delivering heat: a failed ignitor, a seized blower motor, a cracked heat exchanger, or a gas valve that no longer opens. Redwood City’s older housing stock means many systems are 15 to 25 years old, and the failure we find often traces back to years of deferred maintenance rather than one sudden break.
Ignitor and Flame Sensor Work
A furnace that clicks but will not light usually points to a dead hot-surface ignitor or a dirty flame sensor. We stock both parts in common models for Rheem and Goodman units, which are widespread in Redwood City’s mid-century homes. Most ignitor replacements run $150 to $280, parts and labor included, and the repair is covered by the 365-Day Done Right Promise.
Blower and Airflow Repairs
Homes along Alameda de las Pulgas and in the Redwood Village area often have original ductwork sized for heating only, which pushes static pressure high and shortens blower motor life. A blower motor replacement in Redwood City typically falls between $350 and $700 depending on whether the unit needs a standard PSC motor or an ECM upgrade.
Boiler Repair in Redwood City
Boiler repair in Redwood City runs $150 to $650 for most service calls, covering everything from a failed aquastat to a leaking circulator pump. While furnaces dominate the newer developments, plenty of pre-1950s homes near Roosevelt and Stambaugh-Heller still heat with hydronic systems, and those boilers need a tech who understands low-water cutoff switches, expansion tanks, and zone valves, not just forced-air components.
Circulator and Zone Valve Failures
A radiator that stays cold while others heat up usually means a stuck zone valve or a failed circulator. We replace both on Trane and older Weil-McLain systems, and a typical circulator replacement in Redwood City lands between $300 and $550. The written price covers the part, the labor, and the guarantee.
Heat Exchanger and CO Checks
Boilers in damp Redwood City basements and crawlspaces rust faster than dry-climate systems. During every boiler repair, we inspect the heat exchanger for pinholes and run a carbon monoxide check at the flue. If a repair is not safe to make, we say so plainly and give you a written price for the correct fix before we proceed.
Trusted Brands We Service in Redwood City
Our techs are trained to service nine major residential HVAC brands, including Trane, Lennox, Goodman, and Rheem. That means when your Redwood City furnace goes down, the technician who arrives already knows the diagnostic sequence, common failure points, and torque specs for your system. We keep capacitors, ignitors, flame sensors, pressure switches, and blower wheels stocked in common sizes, so most repairs finish the same day rather than waiting on a parts run from Hayward.
Common Furnace Repair Problems We See in Redwood City Homes
- Salt-corroded condenser coils dragging down heat pump performance. Redwood City’s bayside air carries enough salt to pit standard aluminum condenser fins within 4 to 6 years. A no-heat call often turns out to be a corroded outdoor coil reducing the heat pump’s capacity until the indoor furnace overheats and trips a limit switch.
- Rusted heat exchangers in hillside crawlspaces. Homes off Edgewood Road and Farm Hill Boulevard sit on pier-and-grade-beam foundations where horizontal furnaces live in damp crawlspaces. Moisture collects on the heat exchanger, rusts it through, and creates a carbon monoxide risk.
- High static pressure from undersized ductwork. Mid-century ranches in Redwood City frequently have original ducts sized for heating only. When a heat pump or high-efficiency furnace pushes more airflow through those old ducts, static pressure climbs and blower motors fail early.
- Gas valve failures in older systems. Many 1980s-era furnaces in Redwood City still run with original gas valves. When the solenoid wears out, the valve sticks closed and the furnace lights intermittently or not at all. The fix is straightforward, and we write the price before we touch a tool.
See the difference
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AfterPricing for Furnace Repair in Redwood City, CA
Every furnace repair starts with a written price delivered before the work begins. Redwood City pricing runs in line with the Peninsula market, and the table below reflects what homeowners here actually pay for the most common repairs.
| Service | Typical Price Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Heating Repair | $150 – $700 |
| Boiler Repair | $150 – $650 |
What pushes a job toward the top of the range is part complexity, not sales pressure. A flame sensor cleaning is a $150 visit. A blower motor replacement with an ECM motor and control board verification can run $500 to $700. You will always know the number before we start, and the repair carries the 365-Day Done Right Promise in writing. Call (669) 800-4179 for a free estimate, and we will give you a firm quote over the phone or after an on-site diagnostic.
So What’s With All the Salt Air in Redwood City?
Here is the thing few furnace repair companies will tell you about Redwood City: the bayside air carries enough salt to pit standard aluminum condenser fins within 4 to 6 years. Not decades. Years. That is not a scare tactic; it is what we see on equipment every week here. Outdoor heat pump condensers, especially the older copper-aluminum coils with no factory coating, turn white and crusty. The fins crumble when you touch them. Airflow drops. The outdoor unit stops rejecting heat properly, and suddenly the indoor furnace is cycling on high-limit, throwing error codes, and leaving the house cold.
This is why a Redwood City homeowner will sometimes get told they need a new condenser coil when the furnace itself is testing fine. The furnace is not the problem. The outdoor coil is choking on salt. In those cases, we replace the coil with a coastal-coated version, something with an epoxy or polyurethane topcoat designed for marine exposure. It costs more than a standard coil, but it buys back years of service life in this specific climate. Generic advice to just replace the indoor furnace misses the point entirely.
One recent call on Edgewood Road near the hills: a Carrier 3-ton heat pump stopped heating. Our tech found the condenser coil fins had corroded into a white crust and a capacitor was dead. A five-minute test showed the capacitor was delivering only 56% of rated microfarads. We replaced the capacitor, swapped in a coastal-coated coil, and rechecked the refrigerant charge to spec. The system has run clean since. That fix does not come from a generic checklist; it comes from knowing what Redwood City’s bay air does to equipment over time.
We Also Serve Cities Near Redwood City
Our Furnace Repair team covers the whole mid-Peninsula. In addition to Redwood City, we run calls in Menlo Park, Palo Alto, Stanford, and Los Altos, so if you have a rental property or a family member’s home in a nearby city, the same crew and the same written guarantee apply.
Serving Redwood City, CA - Our Local Coverage Area
We’re based in the Redwood 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 Redwood City
The issue is almost always salt corrosion on the outdoor heat pump coil, which is common in Redwood City’s bayside air and reduces heating capacity until the indoor furnace trips a safety limit. We replace the coil with a coastal-coated version and re-verify the refrigerant charge to spec. Call (669) 800-4179 and we will confirm the diagnosis with a written price before any work starts.
Usually yes. Most component-level repairs on horizontal furnaces in Redwood City hillside crawlspaces, like ignitors, flame sensors, gas valves, and pressure switches, can be done in place. If the heat exchanger is rusted through, replacement becomes a bigger job, and we will show you the written numbers for repair versus replacement before you decide.
Every 3 to 4 months during the heating season if your unit is within a mile of the bay. Redwood City’s salt-laden air deposits enough residue to cut airflow quickly, and a rinse with a garden hose at low pressure removes the worst of it. Do not use a pressure washer; it folds the fins flat and makes the problem worse. We can show you the proper technique during a tune-up.
SEER2 is the updated efficiency testing standard for cooling equipment, and it matters in Redwood City because many homes are now pairing older furnaces with newer heat pump condensers. If your repair involves an outdoor unit or coil replacement, matching SEER2-rated components keeps the system efficient and avoids mismatched-capacity failures. We will walk you through it in plain English.
It is specific to homes with crawlspace-mounted horizontal furnaces, which are common in Redwood City’s hillside and mid-century housing stock. Dust settles on the heat exchanger all summer, and the first heating cycle of the season burns it off. One burning-dust smell is normal. If it persists past the first day or smells like metal or gas, call (669) 800-4179 and we will inspect the heat exchanger for cracks.
Call Cold Harbour Heating and Air San Jose for Furnace Repair in Redwood City
When your furnace quits, you want someone who answers the phone, shows up in the window they gave you, and puts the price in writing before a single tool comes out. That is exactly how we operate in Redwood City, and it is backed by the 365-Day Done Right Promise: if the repair fails within a year, we return and make it right at no charge. Call (669) 800-4179 for a free estimate, day or night.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air San Jose, serving Redwood City since 2003.