Lennox HVAC in Hillsborough, CA | Crestview Heating & Air California
Lennox HVAC service in Hillsborough typically runs $150–$700 for repairs and $3,500–$7,500 for full system replacement, with most calls completed same-day. What makes our Lennox work different here is simple: Hillsborough’s 1920s–1950s estate homes weren’t built for modern forced-air systems, and we’ve spent nearly two decades figuring out how to make Lennox equipment work inside walls that predate ductwork by half a century. We’re Crestview Heating & Air California, an independent Lennox service provider—never manufacturer-affiliated—led by owner Marcus Feldman, who still runs service calls himself. Call (844) 560-6978 for a free estimate.
Why Hillsborough Residents Choose Us for Lennox Service
Marcus Feldman trained in HVAC/R at Los Angeles Trade-Technical College, then spent two decades on everything from aging R-22 systems in 1970s tract homes to modern variable-speed heat pumps. He launched Crestview 19 years ago and still manages every job as Service Manager. That means when you call us for Lennox work in Hillsborough, you’re getting an owner who personally signs off on the diagnosis.
We’ve built our Lennox sales & service around real model familiarity, not guesswork. Our vans stock OEM Lennox parts for critical components—compressors, circuit boards, heat exchangers—plus quality aftermarket alternatives for common wear items like capacitors and contactors. This keeps your repair cost reasonable without gambling on cheap generics for parts that can’t fail twice. We’ve earned a 4.8-star average across 250+ reviews, and 250+ customers who left reviews agree that showing up with the right part matters.
Your system, our specialty. That includes Lennox alongside Carrier, Trane, Goodman, Rheem, York, Daikin, Bryant, and American Standard. From emergency calls to commercial buildouts, we don’t turn away equipment because it isn’t our favorite brand.
Common Lennox HVAC Problems We Solve in Hillsborough
- Static pressure faults on Elite EL18XCV blowers. Hillsborough’s gravity-furnace duct chases—often just 6×10 inch plaster-walled passages from the 1930s—are undersized for modern variable-speed air handlers. The EL18XCV’s ECM blower ramps up, hits resistance, and throws a fault code. We measure actual static pressure, then fabricate custom transition boots or add dedicated return drops rather than forcing the motor to fight architecture it can’t beat.
- Pinhole refrigerant leaks in Merit ML14XC1 condensers. Original R-22 Merit units installed on 1920s–1950s estates have cycled through Hillsborough’s warm Bayside summers and cool foothill winters for decades. Thermal expansion at return bends eventually opens pinholes. We nitrogen-test, braze repair where practical, or recommend replacement with R-410A equipment when the repair becomes a band-aid on borrowed time.
- Low-pressure trips on Elite heat pumps. Hillsborough’s hillside clay soils, especially along Crystal Springs Road, shift seasonally. Condenser pads tilt. Refrigerant pools in the low side of the coil. The pressure switch trips. We re-level pads, check charge by true subcooling, and verify the defrost board isn’t masking a deeper issue.
- Propane conversion failures on Signature SLP98V furnaces. Upper Hayne Road corridor homes often run propane, not natural gas. A standard SLP98V ships with NG orifices. Install it without the LP conversion kit and you get incomplete combustion, sooting, and a safety shutdown. We’ve done enough of these to carry the right orifice kit in stock.
- Multi-zone control confusion in sprawling mid-century estates. Hillsborough’s later custom builds sprawl across wings and levels. Lennox iComfort thermostats lose communication with zone dampers, or homeowners inherit a system with no documentation. We trace wiring, map zones, and reprogram controllers so each wing gets heating or cooling when it actually needs it.
Lennox Service in Hillsborough: What Local Conditions Mean for Your Equipment
Hillsborough sits in a Bayside microclimate that’s warmer and sunnier than coastal San Mateo County, but hillside terrain creates real temperature variation. Homes higher on Crystal Springs Road or the upper Hayne Road corridor can run 5–8°F cooler on summer afternoons than properties closer to El Camino Real. That means we don’t use a single ZIP-code load calculation for Hillsborough. We measure.
Here’s the local reality that out-of-area contractors miss: Hillsborough’s Town building department requires a noise study or neighbor setback documentation for condensers closer than 5 feet to property lines, and any condenser visible from the street triggers a design-review hearing. We site equipment in walled mechanical courts or behind dense plantings before pulling the permit, not after. On a recent job on Crystal Springs Road, we replaced a 1980s Lennox Merit with an Elite EL18XCV variable-speed system. The home’s original gravity furnace ductwork—hidden behind ornate plaster walls—couldn’t handle the static pressure, so we fabricated custom transition boots and added a dedicated return drop. The condenser went in a side mechanical court screened by camellias, passing the town’s design review without a hearing. Owner-managed, not outsourced. If I wouldn’t put it in my own house, I’m not putting it in yours.
Lennox Models & Products We Service in Hillsborough
We work across Lennox’s full residential lineup. The Merit Series—ML14XC1 air conditioners, ML180UH gas furnaces—represents the bulk of aging equipment in Hillsborough’s older estates. These are straightforward machines, but parts availability for R-22-era Merit condensers is tightening. We stock compatible compressors and coils for common sizes, and we’ll tell you honestly when a repair doesn’t pencil out against replacement.
The Elite Series—EL18XCV variable-speed AC, EL296E two-stage furnace, EL18XPV heat pump—is where we do most of our retrofit work in Hillsborough. Variable-speed blowers demand proper duct sizing, which is exactly where gravity-furnace conversions get tricky. We carry OEM Lennox circuit boards, ECM modules, and pressure switches for same-day Elite repairs.
The Signature Series—SL28XCV heat pump, SLP98V modulating gas furnace—shows up in newer custom builds and whole-house renovations. These communicate over Lennox’s iComfort platform. We diagnose communication faults, replace failed variable-capacity compressors, and recalibrate modulating gas valves to factory spec.
Lennox Service Pricing in Hillsborough
| Service | Price Range |
|---|---|
| AC Repair | $150–$650 |
| Furnace Repair | $150–$700 |
| AC Installation | $3,500–$7,500 |
| Tune-Up | $80–$200 |
What drives cost? Accessibility matters in Hillsborough. A furnace tucked behind original plaster in a 1930s Tudor costs more to reach than a basement utility room in a 1980s build. Permit coordination for design-review compliance adds time we build into replacement quotes upfront, never as a surprise. Our free estimate includes a full load calculation, duct assessment, and written options—repair versus replace, single-zone versus multi-zone, standard versus high-efficiency. Call (844) 560-6978 for an exact quote. Estimates are free.
Serving Hillsborough, CA — Our Local Coverage Area
We’re based in the Hillsborough 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 — Lennox HVAC in Hillsborough
A dedicated high-velocity mini duct system or a Millbrae Lennox service-style multi-zone mini split setup often works best. We run small flexible ducts through existing chases, closets, or attic spaces rather than cutting ornamental plaster. Marcus Feldman personally assesses each home’s architecture before recommending a path. Call (844) 560-6978 to schedule a walkthrough.
The Town requires noise studies or setback documentation for condensers within 5 feet of property lines, and street visibility triggers a formal hearing. We solve this during planning, not after permit submission, by siting units in mechanical courts or behind screening vegetation. Your permit moves faster, and your neighbors never see the equipment.
Recharging R-22 without fixing the leak is throwing money away; the refrigerant is scarce and expensive. We leak-test first. If it’s a single accessible pinhole on a coil with good structural integrity, braze repair can buy 2–3 years. If the coil is corroded throughout or the compressor shows wear, replacement with a modern R-410A Merit or Elite unit makes financial sense, especially factoring in Hillsborough’s permit costs. Call (844) 560-6978 and we’ll test it on the spot.
Yes. The Town of Hillsborough requires permits for all HVAC equipment replacements, and furnaces must meet current energy code and venting standards. We pull permits as part of our standard replacement package and coordinate inspections so you don’t manage the town hall queue yourself.
Some defrost cycling is normal when outdoor coils drop below freezing, but frequent cycling in Hillsborough’s mild winter temperatures usually indicates low refrigerant charge, a failing defrost thermostat, or restricted airflow from dirty coils. The cooler microclimate in upper Hillsborough elevations can exaggerate the symptom. We check charge, test the defrost board, and clean coils as needed. Call (844) 560-6978 if it’s cycling more than every 30–90 minutes of run time.
Service Areas Near Hillsborough
We run Lennox service calls throughout the Peninsula and beyond. Nearby communities include Lennox service in Emeryville across the Bay, plus Lennox service in Van Nuys where Marcus Feldman grew up in the Woodland Hills area and first learned that a broken AC in San Fernando Valley heat means a very long week. For standard cooling and heating work in the immediate area, see our AC Repair & Installation in Hillsborough page. We also serve San Jose, Fairfield, and surrounding Peninsula towns from our Bay Area base.
Book Your Lennox Service in Hillsborough Today
Call Crestview Heating & Air California at (844) 560-6978 for Lennox repair in San Bruno, Hillsborough, or surrounding areas for replacement or multi-zone system design. Marcus Feldman answers calls personally when he’s not on a job site, and we offer emergency HVAC service for systems that fail outside normal hours. Free estimates. Upfront pricing. Owner-managed, not outsourced.
Written by Marcus Feldman, Owner and Service Manager at Crestview Heating & Air California, serving Hillsborough and the Bay Area since 2006.