Lennox HVAC in Corte Madera, CA | Stonegate Heating & Air California
Independent Lennox service in Corte Madera runs $150–$650 for most repairs, with full system replacements typically falling between $3,500 and $7,500. What makes our Lennox work here different is the crawl space. Corte Madera’s flatland homes sit on filled marshland where moisture and salt air corrode components faster than anywhere else in Marin, so we don’t just swap parts — we seal ductwork against the environment that’s destroying it. Call (855) 467-1888 for a free estimate.
We’ve been servicing Lennox equipment in Corte Madera for 16 years. Jason Trent, our owner and field supervisor, grew up in the San Fernando Valley and took his HVAC training at Los Angeles Trade-Technical College before building Stonegate Heating & Air California. He’s handled enough bay-side service calls to know that a Lennox compressor failure in Corte Madera usually tells a story about what’s happening underneath the house, not just inside the cabinet.
Why Corte Madera Residents Choose Us for Lennox Service
Most HVAC companies in Marin can swap a capacitor. Fewer understand why that capacitor failed in the first place.
We carry OEM Lennox parts for critical components — compressors, control boards, TXV valves — because we’ve seen what happens when generic substitutes meet Corte Madera’s salt-laden bay breezes. For contactors and capacitors, we’ll use quality aftermarket when it makes sense, but never at the cost of reliability. Our Lennox sales & service covers everything from a Merit Series 13ACD to the variable-capacity SL28XCV, and we stock the fast-moving parts locally so you’re not waiting a week for a board that we should have on the truck.
Jason still shows up on the bigger jobs himself. Not for show — because he doesn’t trust a final walkthrough to anyone else. That matters when you’re retrofitting a heat pump into a 1960s ranch on Madera Boulevard and the crawl space clearance is 18 inches. Our 499 verified reviews at 4.7 stars reflect what happens when the same owner-accountable team handles your job from diagnosis to completion.
We’re independent. Not Lennox-authorized, not franchise-affiliated. That means we work on nine major brands — Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, American Standard — so if your home has mixed equipment or you’re comparing options, we don’t steer you toward one manufacturer’s product line.
Common Lennox HVAC Problems We Solve in Corte Madera
- Evaporator coil micro-leaks from salt air corrosion. The marine layer rolling through the US-101 gap carries chloride that attacks copper tubing. We’ve pulled Lennox A-coils from flatland crawl spaces near Paradise Drive with pinhole leaks clustered on the bay-facing side — the coil isn’t defective, it’s being eaten. We pressure-test, locate the leak pattern, and replace with a coated coil when the exposure is severe.
- Compressor short-cycling in undersized return ducts. Corte Madera’s 1950s ranches were built for heating only. When a Lennox XC16 or XC20 gets shoehorned into a system with 14-inch returns designed for a 60,000 BTU furnace, the compressor hits high pressure and shuts off in minutes. We measure static pressure, calculate actual CFM needs, and upsize returns before the new equipment goes in.
- Flex-duct mold within two seasons. Unconditioned crawl spaces in the flatlands run 70–80% humidity year-round. Flex duct without a proper vapor barrier becomes a petri dish. We’ve opened up Lennox installations done by other contractors where the inner liner is black with mold — not because the AC is bad, but because the duct was hung bare on the dirt. We don’t install flex in Corte Madera crawl spaces without full vapor-barrier wrap and mastic-sealed connections.
- Outdoor unit contactor and relay failures. Persistent moisture wicks into electrical compartments even on elevated pads. Lennox Merit and Elite condensers near Richardson Bay show contactor pitting and relay board corrosion at 3–5 years instead of the 8–10 you’d expect inland. We use sealed replacements and elevate units on composite pads where grade allows.
- Heat pump defrost board faults in marine winters. Corte Madera’s mild temperatures keep heat pumps running in defrost mode longer than designed, especially on systems programmed for inland climates. We recalibrate Lennox defrost parameters for the actual local conditions, not the factory default.
Lennox Service in Corte Madera: What Local Conditions Mean for Your Equipment
Corte Madera’s flatland homes on filled marshland require crawl-space ductwork to be sealed with mastic and wrapped with vapor barriers — a standard we enforce because even a single season of unsealed flex duct in this moisture environment breeds visible mold. The water table under portions of the flatlands sits close enough to the old marsh grade that moisture wicks into unconditioned crawl spaces year-round. Salt-laden bay breezes off Richardson Bay simultaneously attack outdoor condensing units and heat-pump components, shortening equipment life noticeably compared to hillside Marin communities like Lennox in Kentfield even a mile or two away.
On a job near the bay front on Paradise Drive, we found a Lennox Merit 13ACD unit with a seized compressor — the original 1960s duct drops in the crawl space were uninsulated and sweating, dripping rust onto the air handler. We replaced the system with an Elite XC16 heat pump, sealed all duct joints with mastic, and added a vapor barrier under the crawl space. The homeowner’s summer electric bill dropped by 40%.
This is why we don’t give phone quotes for Corte Madera Lennox work without seeing the installation environment. The system will tell you what’s wrong — you just have to know how to listen. But you have to be under the house to hear it.
Lennox Models & Products We Service in Corte Madera
We service the full Lennox residential line:
- Merit Series: 13ACD, 14ACX — single-stage workhorses common in Corte Madera ranches built 2000–2015
- Elite Series: XC16 two-stage, XC20 variable-capacity — our go-to for flatland retrofits where humidity control matters
- Signature Series: SL28XCV heat pump, SLP98V furnace — premium installs with the quietest operation for hillside homes near Ring Mountain
- PureAir filtration: whole-home air quality systems that pair with any Lennox handler
For critical repairs, we source OEM Lennox parts — compressors, control boards, sensors. For wear items like contactors and capacitors, we’ll use quality aftermarket when available and appropriate. Our trucks carry the fast-moving inventory for Corte Madera, so most Lennox repairs don’t wait on a warehouse shipment. If your heating and furnace in Corte Madera is also Lennox, we handle both sides in one call.
Lennox Service Pricing in Corte Madera
| Service | Price Range |
|---|---|
| AC Repair | $150–$650 |
| Furnace Repair | $150–$700 |
| AC Installation | $3,500–$7,500 |
| Tune-Up | $80–$200 |
What drives cost? For repairs, it’s parts (OEM vs. aftermarket) and accessibility — a compressor swap in a tight crawl space on Madera Boulevard takes longer than the same job with a garage-mounted air handler. For installations, it’s whether we’re retrofitting into existing 1960s ductwork or replacing corroded galvanized runs that have reached end of life.
Our free estimate includes a full load calculation, duct inspection, and written options — repair vs. replace, with honest numbers on expected lifespan in Corte Madera’s environment. Call (855) 467-1888 to schedule. Estimates are free, and we’ll show you exactly what we’re seeing under your house.
Serving Corte Madera, CA — Our Local Coverage Area
We’re based in the Corte Madera area and know this community well, including nearby Lennox in Larkspur. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs — Lennox HVAC in Corte Madera
Mold appears because unsealed flex duct in Corte Madera’s high-moisture crawl spaces collects condensation within months. The marine humidity baseline here is higher than Lennox in Tamalpais Valley or Novato, and filled marshland soils wick moisture upward year-round. We prevent this by sealing all duct joints with mastic and wrapping flex runs with vapor barriers — steps that should be standard but often get skipped. If you’re seeing mold now, call (855) 467-1888 for a duct inspection and remediation estimate.
Not automatically. If repair costs stay under 50% of replacement and the system isn’t leaking refrigerant, we repair. But in Corte Madera, 18-year-old equipment has faced nearly two decades of salt air and marsh moisture. We inspect the coil, compressor amp draw, and duct condition. When the cumulative repair trajectory exceeds replacement value — or when the old R-22 system needs a major component — we’ll show you the math. Call (855) 467-1888 and we’ll give you an honest assessment.
Sometimes, but rarely without modifications. Corte Madera’s ranch homes were built with heating-only ducts sized for furnace airflow. Heat pumps need higher CFM per BTU, and undersized returns cause compressor short-cycling. We measure your existing ductwork’s static pressure and capacity. If returns are adequate, we may adapt; if not, we upsize before the Lennox heat pump goes in. The alternative is a ductless mini-split system for zone-by-zone cooling without touching the old ducts.
Yes. Corte Madera follows Marin County building codes, and furnace replacement requires a permit with inspection. We handle the paperwork and schedule inspections as part of our installation process. The permit verifies proper venting, combustion air, and gas line sizing — critical safety checks, especially in older homes with original utility configurations.
Twice yearly — spring and fall. The salt air and moisture here accelerate corrosion on outdoor coils and electrical components. A spring tune-up catches contactor pitting and coil degradation before peak season; fall service checks heat pump defrost operation and seals before the rainy season. Our tune-ups run $80–$200 and include coil cleaning, electrical testing, and refrigerant pressure verification. In this environment, skipping maintenance cuts equipment life by years. Call (855) 467-1888 to schedule.
Service Areas Near Corte Madera
We handle Lennox calls throughout southern Marin and across the Bay Area. Our regular routes include Lennox service in Mill Valley for the hillside homes off Panoramic Highway, and Lennox service in Gardena down in Los Angeles County where we maintain commercial accounts. Closer to Corte Madera, we cover San Rafael, Larkspur, and the Tamalpais Valley. Same owner-supervised standard, same nine-brand capability, wherever the job is.
Book Your Lennox Service in Corte Madera Today
Call (855) 467-1888 for independent Lennox service in Corte Madera. Jason Trent or one of our field-supervised technicians will diagnose your system, show you what’s actually failing, and fix it — whether that’s a sealed crawl-space duct repair, a compressor replacement, or a full heat-pump retrofit. Same-day availability for urgent calls. Free estimates. No runaround.
Written by Jason Trent, Owner and Field Supervisor at Stonegate Heating & Air California, serving Corte Madera and California’s HVAC market since 2008.