My furnace is blowing cold air — what should I check?

First check: thermostat set to HEAT (not COOL or FAN). Then check the air filter — a clogged filter can cause overheating and safety shutdown. If those are fine, it could be a flame sensor, igniter, or gas valve issue. We can diagnose the same day.

How much does furnace repair cost in San Mateo?

Diagnostic starts at $89. Most repairs are $150–$600. Igniter or flame sensor: $150–$300. Blower motor: $400–$800. Heat exchanger: $800–$2,500 (often worth replacing the unit at that point). Upfront pricing always.

Should I repair or replace my old furnace?

Under 15 years with a minor issue — repair. Over 20 years, cracked heat exchanger, or R-22 heat pump — replacement makes sense. California rebates for high-efficiency systems can offset 15–30% of replacement cost.

25–40 min from Los Gatos HQ

Furnace Repair
San Mateo, CA

San Mateo’s Peninsula location means morning fog, damp winters, and furnaces that work hard from November through March. The Hillsdale and Baywood neighborhoods have aging furnaces in homes built during the 1960s–1970s. Bay Meadows’ newer stock has modern equipment with electronic controls. We repair all types, same-day when needed.

(408) 581-2241

25–40 minFrom Los Gatos HQ

5.0 ★Google Rating

Same DayEmergency Service

C-20 & C-38Dual Licensed

C-20 HVAC License EPA 608 Certified NATE Certified

Furnace Repair in San Mateo: Peninsula Fog Demands Reliable Heat

San Mateo’s heating needs are more consistent than South Bay cities. The marine influence brings cool, damp air that keeps mornings in the 40s even into April. Homes in the Hillsdale area, Baywood, and along the 101 corridor run their furnaces heavily through the winter months, accumulating more operating hours than equivalent homes in San Jose or Milpitas.

That heavier use accelerates wear. Blower bearings in Hillsdale furnaces develop noise and friction earlier, ignitors crack from more thermal cycles, and heat exchangers in 30+ year-old units are a genuine safety concern. We perform carbon monoxide testing on every San Mateo furnace repair call.

The Park neighborhood and areas near Central Park have a mix of mid-century and newer homes. Some still have wall heaters or floor furnaces in older cottages. Bay Meadows development has modern condensing furnaces with electronic diagnostics. We service the full range.

Furnace Types We Repair in San Mateo

Gas forced-air: Hillsdale, Baywood, Park. Standard repairs. Details.

High-efficiency condensing: Bay Meadows, newer construction. Condensate, pressure switch, controls.

Wall & floor heaters: Older cottages and apartments near downtown. Williams, Empire brands.

Furnace Repair Costs in San Mateo

Diagnostic / Service Call $89–$150

Ignitor or Flame Sensor $150–$350

Blower Motor $400–$900

Gas Valve $350–$700

Heat Exchanger Inspection $150–$300

Residential furnaces in San Mateo. Diagnostic applied toward repair. 25–40 min from Los Gatos.

Why Us

Why San Mateo Calls North Breeze for Furnace Repair

Peninsula Heating Experts

San Mateo’s damp, foggy winters create specific furnace demands we understand well.

Safety First

CO testing every call. Combustion analysis when heat exchanger condition is questionable.

Same-Day Winter Service

Furnace failure in January gets immediate attention. 25–40 min from Los Gatos.

All System Types

1960s gas furnaces, modern condensing, wall heaters, radiant — San Mateo has them all, and so do we.

FAQ

Furnace Repair San Mateo — Common Questions

Why does my San Mateo furnace run so much more than my friend’s in San Jose?

San Mateo’s Peninsula climate is consistently cooler and damper than San Jose. Your furnace logs significantly more operating hours over the winter. This is normal but means maintenance is more important — annual tune-ups and filter changes keep the higher usage from translating to premature failure.

My Hillsdale furnace makes a banging sound when it starts — should I be worried?

A single bang at startup is often delayed ignition — gas accumulates briefly before the ignitor lights it, causing a small “boom.” This is a safety concern that should be addressed promptly. It’s usually caused by a dirty burner, weak ignitor, or gas valve timing issue. Call us for a same-day diagnostic.

Do you replace old wall heaters in San Mateo apartments?

Yes. Wall heaters in older San Mateo apartments and cottages are common. We replace Williams, Empire, and other brands, and can also convert to more efficient mini-split systems if the property owner prefers. For multi-unit buildings, we offer volume pricing.