AC repair
Furnace & heating
Heat pumps
Ductless mini splits
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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 estimateLennox HVAC in San Mateo, CA
We provide independent Lennox service across San Mateo, from furnace repair on the fog-cooled west side to AC repair on the warmer east-side flats. We’re not affiliated with Lennox, and we don’t sell equipment for a manufacturer. What separates our Lennox work here is that we know both of San Mateo’s climate zones and how the same brand fails differently on each side of El Camino Real. Need help now? Call (833) 439-0749. We answer 24/7, with fast dispatch from 7am to 7pm.
Our technicians have up to 11 years of experience, and we work on nine of the most common residential HVAC brands. Lennox is one of them, and it’s one we see often enough that the control boards, blowers and refrigerant circuits aren’t a mystery to us.
Why San Mateo Residents Choose Us for Lennox Service
Homeowners in San Mateo call us because they already have a Lennox system and they want a technician who recognizes the equipment without guessing. Lennox builds solid equipment, but the brand has its own habits: control-board quirks on the Signature and Elite furnaces, capacitor failures on the outdoor units, and heat exchangers that give up when airflow is restricted. Knowing those patterns saves diagnostic time and gets you a straight answer faster.
We also use quality parts that fit. OEM Lennox control boards, ignitors and heat exchangers go in where reliability matters, and quality aftermarket capacitors and contactors are fine when they meet spec. No pressure to replace what can be repaired.
We focus only on heating and cooling. That means when you call about a Lennox furnace in San Mateo or a Lennox AC unit in San Mateo, the person on the phone and the technician at the door are both working in their one area of expertise. Scheduling is clear: you’ll know what’s happening and when. For Lennox service in San Mateo, call (833) 439-0749.
Styles & brands we work with
- AC repair
- Furnace & heating
- Heat pumps
- Ductless mini splits
- Carrier
- Trane
- Goodman
Common Lennox HVAC Problems We Solve in San Mateo
Here’s what we actually find when we open up Lennox equipment in San Mateo. The failure depends a lot on which side of the city the system is on.
- Corroded outdoor coils and seized condenser fan motors on west-side Lennox units. Damp fog-belt air works on outdoor equipment year after year. We see this a lot in 94402 and up in the Highlands, where the coastal moisture never really lets up. Coil cleaning and motor replacement are the usual fixes.
- Failed run capacitors and pitted contactors on east-side Lennox systems. Out in the warmer flats of 94401 and 94403, systems cycle harder on hot inland afternoons, and capacitors and contactors wear out faster than they should. A weak capacitor is often the difference between an AC that keeps up and one that doesn’t.
- Cracked heat exchangers in older Lennox furnaces. When a pre-1960 San Mateo home has undersized original ductwork, airflow gets restricted and older furnaces run hotter than they should. That’s a real safety concern, and it’s one we treat seriously.
- Control-board and ignitor failures on Lennox Signature and Elite furnaces. Voltage spikes and long summer stretches with the furnace off both contribute. When the furnace comes back on in the fall, that’s when the problem shows up.
- Short-cycling and blower-running-without-heat. On a foggy west-side morning, a homeowner in a 1940s bungalow might notice the Lennox furnace cycling oddly while the blower runs but never heats. A qualified technician usually finds a cracked heat exchanger or a failing ignitor, runs a combustion analysis, and recommends OEM replacement of the affected part.
The high-tension control boards and exchangers inside a furnace aren’t a place for a homeowner to work. If your Lennox system is short-cycling or you smell gas, shut it down and call a trained technician. Call (833) 439-0749.
Lennox Service in San Mateo: What Local Conditions Mean for Your Equipment
San Mateo’s pre-1960 housing stock shapes Lennox work here in a way it doesn’t in most neighboring cities. Many of these homes are 1920s – 40s bungalows or Spanish-stucco houses, and plenty still have original wall-furnace vents and tight closets that physically limit where a new Lennox air handler or coil can go. That makes a changeout far more about layout than equipment specs. We work around the closets, the vents and the existing ducting instead of pretending a standard drop-in will fit. If you’re in the Highlands or one of the older blocks near El Camino Real, expect that conversation before any install quote. A proper load calculation and Title 24 compliance check go with it, because much of San Mateo lacks central AC and these retrofits have to be done by the numbers.
Lennox Models & Products We Service in San Mateo
We service the Lennox lines you’ll find in San Mateo homes, including the Merit Series air conditioners and furnaces, the Elite Series, the Dave Lennox Signature Collection, and Lennox ductless mini-split systems. Whether it’s a Merit unit on an east-side rental or a Signature furnace in a west-side house, we treat the equipment on its own terms.
On the parts side, we keep it simple: OEM Lennox control boards, ignitors and heat exchangers when reliability matters, and quality aftermarket capacitors and contactors where they meet the spec and save you money. We don’t claim to be a Lennox dealer, and we’re not authorized by the manufacturer. We’re an independent Lennox specialist, which is why we can recommend the right fix for the system you have. Our Lennox expertise is what we build on.
See the difference
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After
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AfterLennox Service Pricing in San Mateo
What you pay depends on the job, and the written estimate is what sets the final price. Here are the typical ranges for the work we do in San Mateo:
| Service | Typical Estimated Range |
|---|---|
| AC Repair | $175 – $765 |
| Furnace Repair | $175 – $825 |
| AC Installation | $4130 – $8850 |
| Tune-Up | $95 – $235 |
For a repair, what drives cost is the part itself and how deep the diagnosis runs: a capacitor swap sits at the low end, while a cracked heat exchanger or a failed control board sits higher. Installations depend on layout. In a pre-1960 San Mateo home with tight closets and original ducts, labor is the larger variable. A tune-up is straightforward and priced flat.
The estimate is free, and we put it in writing before any work starts. Call (833) 439-0749 to get yours.
Serving San Mateo, CA – Our Local Coverage Area
We serve San Mateo and nearby communities. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
FAQs – Lennox HVAC in San Mateo
On the fog-cooled west side, a Lennox furnace that runs without heating is typically a failed ignitor or a cracked heat exchanger. Long summer stretches with the furnace off, followed by fall startup, tend to surface these problems. A combustion analysis confirms which one it is before we recommend OEM replacement of the affected part. Call (833) 439-0749 for an exact quote. Estimates are free.
A weak dual-run capacitor or a dirty condenser coil is the usual culprit on east-side afternoon struggles. Morning temperatures are mild, so the system keeps up, but once the inland heat builds, the marginal part can’t carry the load. A capacitor swap plus coil cleaning and a refrigerant check usually settles it. Call (833) 439-0749 for an exact quote.
Often yes, because San Mateo winters are mild and rarely drop below the mid-30s, which suits heat pump performance. The catch is the original ductwork and tight closet space: before recommending one, we check airflow and do a proper load calculation, and Title 24 compliance matters on these older homes. If the ducts can carry the load, a heat pump can be a solid choice. Call (833) 439-0749 to discuss your home.
Damp coastal air speeds up corrosion on the outdoor coil and can eventually seize the condenser fan motor, especially in 94402 and up in the Highlands. Coil cleaning and motor replacement are the typical fixes, and regular tune-ups help catch the corrosion early. If your outdoor unit has been sitting in the fog belt for a while, it’s worth a look. Call (833) 439-0749 for an exact quote.
On Elite and Signature equipment under 12 years old, repair is usually the right call. On a 20-year-old Merit system with a failed compressor or a cracked heat exchanger, replacement often makes more sense than repeated repairs. At 15 years, it depends on the specific failure and what the rest of the system looks like. Call (833) 439-0749 for an exact quote. Estimates are free.
Service Areas Near San Mateo
We serve San Mateo and the surrounding cities, including Fremont, Hayward, Sunnyvale, San Jose and Morgan Hill. If you’re on the Peninsula or just across the Bay and want independent Lennox service, San Mateo is home base for this page. See our Hayward and Fremont pages for nearby service.
Book Your Lennox Service in San Mateo Today
If your Lennox system needs a repair, a tune-up, or a straight answer about replacing it, call (833) 439-0749. We’re an independent Lennox specialist covering furnace repair, AC repair and heat pump installation across San Mateo. Same-day service is often available. We answer 24/7, with fast dispatch from 7am to 7pm, Sunday through Friday. Closed Saturday. The estimate is free, the price is set in writing, and we repair first. Call today.
Written by the team at AC Repair Santa Clara.