Fast, Reliable Heating & Furnace Across San Mateo
Heating and furnace repair in San Mateo typically runs $150–$700 for standard repairs, while full furnace replacement costs between $3,500 and $7,500. Most San Mateo homes get same-day or next-day service, especially in the 94401, 94402, and 94404 ZIP codes we cover regularly. Call (844) 560-6978 for a free estimate.
We’ve been driving to San Mateo from our San Jose base for nearly two decades, and we know the Peninsula’s heating quirks inside out. The post-WWII ranch houses along 28th Avenue, the hillside streets of 94402 with their vented crawl spaces, the Bay-front condos in 94404 — each has its own furnace story. Marcus Feldman, our owner and Service Manager, still manages jobs personally, so when you call Crestview Heating & Air California, you’re talking to someone with skin in the game, not a dispatcher reading from a script.
Why Crestview Heating & Air California Is San Mateo’s Preferred Heating & Furnace Company
Our Heating & Furnace team has built a 4.8-star average across 250+ customer reviews, and plenty of those come from San Mateo homeowners who found us after frustrating experiences with bigger outfits. They mention the same things: Marcus showed up, diagnosed the actual problem instead of pushing a sale, and fixed it without a return trip.
That matters in San Mateo, where the housing stock demands real expertise. The 1940s–1970s tract homes in 94401 and 94403 still run original or once-updated gas forced-air furnaces through unconditioned crawl spaces. One missed detail — a cracked heat exchanger, corroded gas valve, or collapsed flex duct — and you’re cold for another night. Our 19 years in HVAC means we’ve seen virtually every failure mode these systems can throw at us.
We don’t outsource to subcontractors. Marcus manages every job, and our factory training covers Trane, Lennox, Goodman, and Rheem among nine major brands. Your system, our specialty. No “we don’t work on that.”
Our Heating & Furnace Services in San Mateo
Furnace Repair
San Mateo’s marine-layer climate creates a specific repair pattern we see constantly: condensation in unsealed crawl spaces, especially near the Highway 92 gap, rusts furnace cabinets and corrodes gas valves. A furnace that ran fine in October starts short-cycling by January. Our typical furnace repair in San Mateo runs $150–$700, and we carry common parts for Trane, Lennox, and Goodman systems to avoid ordering delays. We target same-day completion because nobody in 94401 or 94402 should sleep without heat.
Furnace Replacement
The dominant replacement scenario in San Mateo isn’t just swapping an old box for a new one. In the 94402 hillside neighborhoods, we regularly encounter flex ductwork added as an afterthought through cold, vented crawl spaces. The heat loss is so severe that the duct system becomes the bottleneck, not the furnace. We tackled a furnace replacement in a 1950s ranch house along 28th Avenue in 94403, where the original Carrier from the early ’90s had a cracked heat exchanger. We installed a new Trane high-efficiency furnace and replaced the flex duct snaking through the uninsulated crawl with rigid, sealed metal, ensuring one-trip completion for the homeowner. Full furnace replacement in San Mateo typically runs $3,500–$7,500, including necessary duct modifications.
Furnace Tune-Up
A proper tune-up in San Mateo means more than a filter swap and a visual glance. We inspect for rust from marine-layer moisture, test gas valve operation under real load conditions, and check heat exchanger integrity with a camera scope. The $95–$235 tune-up range pays for itself when it catches a cracked heat exchanger before it dumps carbon monoxide into your living space. We recommend annual service, ideally before the first cold snap hits the Peninsula.
Heat Exchanger Repair & Replacement
Cracked heat exchangers are the hidden killer in San Mateo’s aging housing stock. Decades of thermal cycling in original gas forced-air furnaces from the 1940s–1970s eventually fatigue the metal. It’s not always obvious — sometimes the only sign is a faint chemical smell or unexplained headaches. We scope every suspected unit, and if the heat exchanger is compromised, we give you straight numbers: repair at $150–$700 if the part is available and the furnace age justifies it, or full replacement if the unit is past 15–20 years. No scare tactics. Just facts.
Gas Valve Repair
Corroded gas valves from crawl-space moisture are a signature San Mateo failure mode, particularly in homes near the Highway 92 corridor where fog penetration is heaviest. A sticking valve can cause delayed ignition, rollout, or complete failure to fire. We test manifold pressure, check for proper shutoff, and replace with OEM-spec valves — not universal substitutes that void your warranty.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Mateo
We maintain active factory-trained compatibility across Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For San Mateo customers, that means we stock common ignitors, gas valves, and control boards for Trane, Lennox, Goodman, and Rheem systems locally, cutting wait times when your furnace fails on a cold January morning. We don’t tell you to “call the manufacturer.” We fix it.
Common Heating & Furnace Problems We See in San Mateo Homes
- Cracked heat exchangers in pre-2000 furnaces. The post-WWII tract homes across 94401, 94402, and 94403 still run original or second-generation gas forced-air units. Decades of thermal cycling fatigue the heat exchanger metal until it separates, creating a carbon monoxide risk that demands immediate attention.
- Collapsed flex ductwork in 94402 crawl spaces. Hillside neighborhoods feature flex duct added as an afterthought through cold, vented crawl spaces. The material tears, disconnects, or crushes under its own weight, causing uneven heating, excessive dust, and rooms that never reach temperature.
- Corroded gas valves from marine-layer condensation. Pacific fog funnels through the Highway 92 gap and settles in unsealed crawl spaces, rusting furnace cabinets and pitting gas valve components. We see this most in homes west of El Camino Real.
- Uneven heating between fog-cooled and sun-exposed zones. The flat, Bay-facing eastern sections of 94404 and 94401 lose the marine-layer buffer and can run 8–12°F warmer than western neighborhoods, meaning identical furnace settings produce wildly different comfort levels across the same city.
Pricing for Heating & Furnace in San Mateo, CA
Here’s what heating and furnace work actually costs in San Mateo’s market:
| Service | Typical Range in San Mateo |
|---|---|
| Furnace Repair | $150–$700 |
| Furnace Replacement | $3,500–$7,500 |
| Heat Exchanger Repair | $150–$700 |
| Furnace Tune-Up | $95–$235 |
What moves you within these ranges? Furnace age and brand parts availability are the big ones. A 1995 Goodman with a cracked heat exchanger usually means replacement. A 2015 Trane with a failed ignitor is a straightforward repair. Ductwork condition matters too — in 94402 hillside homes, we often find that flex duct replacement adds $800–$2,000 to a furnace job, but it’s non-negotiable if you want the system to actually deliver heat. We quote everything upfront before starting work. Call (844) 560-6978 for your free estimate.
We Also Serve Cities Near San Mateo
Our service radius covers the full Peninsula corridor, including Foster City, Belmont, Hillsborough, and Redwood Shores. Whether you’re managing a commercial property near the Foster City lagoon or a ranch house in the Hillsborough hills, the same owner-managed service applies. From emergency calls to commercial buildouts, we don’t differentiate by zip code.
Serving San Mateo, CA — Our Local Coverage Area
We’re based in the San Mateo 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 — Heating & Furnace in San Mateo
Yes, if your crawl space is vented and uninsulated, which describes most 94402 hillside homes and many 94401 ranches. The original flex ductwork installed in these spaces collapses, tears, or leaks so severely that it wastes 20–30% of your furnace’s output before it ever reaches your vents. We typically recommend replacing flex duct with rigid, sealed metal ductwork during any major furnace service. Call (844) 560-6978 and we’ll inspect your specific crawl space configuration.
Uneven heating in 94401 usually traces to one of three causes: collapsed flex duct in the crawl space, an undersized furnace for the home’s actual heat load, or a cracked heat exchanger disrupting proper combustion airflow. The flat, eastern portion of 94401 also loses the marine-layer cooling that western San Mateo enjoys, so afternoon sun loads can expose weaknesses in duct distribution. A thorough inspection identifies which factor is dominant. Call us for a diagnostic — estimates are free.
Almost always, yes. A 30-year-old furnace in San Mateo’s post-WWII housing stock operates at 60–70% efficiency at best, versus 95%+ for modern units. More critically, heat exchanger failure risk rises sharply after 20 years, and replacement parts for pre-2000 systems are increasingly scarce. The $3,500–$7,500 replacement cost typically pays back in 5–8 years through gas savings alone, plus you eliminate the carbon monoxide risk of a cracked exchanger. We’ll give you honest numbers on your specific unit.
Yes, the City of San Mateo requires a mechanical permit for furnace replacement, including inspection of gas line connections and venting. We handle permit submission and scheduling as part of our replacement service. The process typically adds 2–3 business days to the timeline but protects your warranty and ensures code-compliant installation. We’ll walk you through exactly what’s required for your property.
Pacific fog funnels through the Highway 92 gap and elevates humidity in crawl spaces, especially west of El Camino Real. That moisture rusts furnace cabinets, corrodes gas valves, and degrades ignitor performance over time. We inspect for corrosion during every tune-up and recommend crawl-space moisture mitigation — vapor barriers, vent sealing, or dehumidification — as a parallel investment to furnace service. Annual maintenance catches these issues before they cause mid-winter failures. Call (844) 560-6978 to schedule.
Ready to get your San Mateo home’s heating sorted? Whether you’re dealing with a cracked heat exchanger in a 1950s ranch, corroded gas valves from crawl-space moisture, or uneven heating that nobody else has diagnosed correctly, Crestview Heating & Air California brings 19 years of owner-managed expertise to every job. No outsourced technicians. No “we don’t work on that.” Just straight answers and work that holds up. Call (844) 560-6978 now for your free estimate.
Written by Marcus Feldman, Owner at Crestview Heating & Air California, serving San Mateo and the Peninsula since 2005.