Lennox HVAC in Los Gatos, CA | Stonegate Heating & Air California
Independent Lennox service in Los Gatos runs $150–$700 for most repairs, with same-day availability across 95030, 95031, 95032, and 95033. What separates our work here is the fuel-source duality: we routinely switch between natural-gas Lennox furnaces on the valley floor and propane-rated systems in the 95033 mountain communities above Lexington Reservoir, where PG&E gas lines don’t reach. Call (855) 467-1888 for a free estimate.
Why Los Gatos Residents Choose Us for Lennox Service
We’ve been working on Lennox in Cupertino and across California for 16 years. Jason Trent, our owner and Field Supervisor, still shows up on the bigger jobs himself. He grew up in the San Fernando Valley, spent enough summers without reliable AC to know exactly what that feels like, and took HVAC coursework at Los Angeles Trade-Technical College before building this business. That background shows up in how we diagnose: we listen to what the system is actually doing, not what a flowchart says it should be doing.
Our Lennox sales & service covers the full product line, from Merit Series entry units to Signature Series variable-capacity systems. We’re not a manufacturer-authorized dealer, which means we’re free to recommend the repair that makes financial sense for your situation, not the replacement that hits a quota. We carry OEM Lennox parts for critical components and quality aftermarket parts where appropriate. Across 499 verified reviews averaging 4.7 stars, the pattern we hear back is consistent: the problem got fixed, the invoice matched the estimate, and Jason or a senior tech was actually on site.
Common Lennox HVAC Problems We Solve in Los Gatos
- Merit 13ACD refrigerant leaks at the evaporator coil U-bends. Downtown Los Gatos (95030) has a notable concentration of pre-WWII homes where original Lennox systems have run 15+ years. The copper U-bends fatigue, and the R-410A charge drops slowly enough that homeowners notice weak cooling first, not a hard failure. We pressure-test, locate the leak, and replace the coil with OEM parts to keep any remaining warranty intact.
- SLP98V furnace ignitor failure in 95033 mountain homes. Long electrical runs from the transformer to hillside addresses mean voltage sag on startup. The silicon nitride ignitor in Lennox’s top-tier furnace doesn’t get enough consistent voltage, cracks prematurely, and throws a pressure-switch or ignition-lockout code. We check incoming voltage under load, not at rest, and we’ll tell you if a dedicated circuit solves it better than replacing the ignitor again.
- SL28XCV variable-speed compressor short-cycling in 95030/95032 ranch homes. Those 1950s–1970s tract houses have aging, undersized duct runs. The SL28XCV tries to modulate down to 35% capacity for efficiency, but the static pressure spikes because the ducts can’t move air at low CFM. The compressor cycles on and off instead of running long, efficient loops. We measure static pressure and often recommend duct modification alongside the compressor fix.
- Elite series secondary heat exchanger corrosion in propane applications. Homes above Lexington Reservoir in 95033 run LP, not natural gas. The combustion chemistry differs: propane burns hotter and produces more water vapor. Lennox Elite furnaces not properly converted from factory NG settings develop condensate drainage problems that rot the secondary heat exchanger from the inside out. We’ve replaced enough of these to check combustion analysis first, every time.
- General capacity mismatch across Los Gatos microclimates. A 95030 home on the valley floor hits 100°F in July; a 95033 home off Summit Road might sit at 78°F the same afternoon with marine fog pushing through. Equipment sized on regional Manual J averages routinely over-cools the mountains and under-cools the flats. We run load calculations specific to your elevation and exposure, not your ZIP code’s average.
Lennox Service in Los Gatos: What Local Conditions Mean for Your Equipment
Los Gatos spans three distinct fuel-source zones, and most HVAC contractors act like there’s only one. The valley floor addresses in 95030 and 95032 have PG&E natural gas mains. Drive up Aldercroft Heights Road or Chemeketa Park Road into 95033, and you’re beyond the gas grid entirely. Homes there run propane tanks, usually 250–500 gallons buried or pad-mounted on decomposed granite slopes.
This matters for every Lennox furnace replacement we quote in the mountains. The SLP98V and EL195E ship natural-gas default. Converting to propane requires orificing down every burner, swapping the gas valve regulator spring, and recalibrating the manifold pressure to 10.0 inches water column instead of 3.5. The combustion air intake needs adjustment for LP’s higher oxygen demand. Skip any of this, and the flame burns rich, sooting the heat exchanger and throwing CO risk. We’ve seen flatland contractors miss the LP conversion entirely, quote a standard NG install, and show up with equipment that can’t legally or safely run. Before we quote any 95033 replacement, we confirm tank size, regulator output pressure, and access road conditions. Summit Road and its spurs can add 30–40 minutes each way to what looks like a routine call. Our mountain techs carry LP conversion kits, combustion analyzers calibrated for propane, and the patience to level a condenser pad on a 15% grade.
Lennox Models & Products We Service in Los Gatos
We work on every Lennox residential line, from discontinued units still running in Los Gatos hillside homes to current production models:
- Merit Series: 13ACD, 14ACX — single-stage workhorses, common in 1990s–2000s tract homes across 95032. We stock replacement compressors and evaporator coils for fast turnaround.
- Elite Series: EL16XC1 two-stage AC, EL195E high-efficiency gas furnace. The EL195E is a frequent replacement choice for 95030 homes with tighter lots and noise concerns.
- Signature Series: SL28XCV variable-capacity heat pump, SLP98V modulating gas furnace. These pair well in 95033 for homeowners wanting electric backup with propane primary heat.
Our parts approach: OEM Lennox compressors, heat exchangers, and control boards to protect warranty coverage and system longevity. Quality aftermarket capacitors, contactors, and hard-start kits where the cost difference matters and reliability is equivalent. We explain which we’re using and why before we order.
Lennox Service Pricing in Los Gatos
| Service | Price Range |
|---|---|
| AC Repair | $150–$650 |
| Furnace Repair | $150–$700 |
| AC Installation | $3,500–$7,500 |
| Tune-Up | $80–$200 |
What drives where you land in these ranges: part type (OEM vs. aftermarket), accessibility (crawl space vs. garage), and whether we find secondary issues during diagnostic. A seized Merit 13ACD compressor in a tight 95030 attic costs more in labor than the same job with ground-level access. Propane conversions in 95033 add material cost but save you from hiring a second contractor. Every estimate we provide in Los Gatos is free, itemized, and valid for 30 days. Call (855) 467-1888 to schedule — we’ll give you a real number, not a teaser rate.
Serving Los Gatos, CA — Our Local Coverage Area
We’re based in the Los Gatos area and know this community well, and we also handle Lennox repair in Saratoga. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs — Lennox HVAC in Los Gatos
Yes. We install and service propane-rated Lennox furnaces and heat pumps throughout the 95033 mountain communities, including full LP conversion, combustion calibration, and coordination with your propane supplier for tank sizing. Call (855) 467-1888 and we’ll confirm your tank capacity and regulator output before quoting.
Yes. We specialize in ductless Lennox mini-split installations for historic Craftsman and Victorian homes in 95030 where original plaster walls and limited attic clearance rule out ducted retrofits, with similar expertise for Lennox repair in Campbell. We use slim-profile line-set covers and strategic indoor unit placement to minimize visual impact. Jason Trent supervises these installs personally — he grew up in old California housing stock and knows how to run refrigerant lines without destroying character details.
Voltage drop from long electrical service runs to mountain addresses. The SLP98V and EL195E silicon nitride ignitors need consistent 120V at startup; undersized wiring or distant transformers deliver less under load, causing hot spots that crack the ceramic. We measure voltage at the furnace during ignition, not at the panel, and we’ll tell you if a dedicated 20-amp circuit fixes it permanently.
Usually replace. The 13ACD uses R-410A refrigerant, which is being phased down and rising in price. At 15 years, you’re past the design life, and evaporator coil leaks (common in this model) tend to recur. We honestly assess: if the repair extends reliable life by 3+ years and costs under 30% of replacement, we’ll recommend it. Otherwise, we’ll quote a current Lennox replacement with proper load calculation. Call (855) 467-1888 for a free evaluation.
If your home is in 95033, has additions, mixed sun/shade exposure, or sits on a graded lot with walkout basements, you need one. Regional average sizing routinely under-specs heating for mountain elevations and over-specs cooling for fog-cooled exposures. We run Manual J calculations for every full replacement in Los Gatos — it’s the only way to size a variable-capacity SL28XCV or modulating SLP98V correctly. Call (855) 467-1888 to schedule.
Service Areas Near Los Gatos
We run AC Repair & Installation in Los Gatos as our home base, with regular service to neighboring communities. For Lennox-specific work, we also cover Lennox service in Olivehurst and Lennox service in Woodcrest. Additional nearby areas include West Covina, Vista, Sacramento, San Leandro, Valinda, and Baldwin Park.
Book Your Lennox Service in Los Gatos Today
Same-day Lennox service is available across Los Gatos and Lennox in Communications Hill when you call (855) 467-1888. Jason Trent or a senior tech will arrive, diagnose, and give you an upfront estimate before any work begins. Sixteen years, nearly 500 reviews, and owner supervision on every job. The system will tell you what’s wrong — you just have to know how to listen.
Written by Jason Trent, Owner and Field Supervisor at Stonegate Heating & Air California, serving Los Gatos and California’s HVAC market since 2008.