Heating & Furnace in San Jose — Same-Day Service, Done Right the First Time

Fast, Reliable Heating & Furnace Across San Jose

Heating and furnace repair in San Jose typically costs $175–$825, while full replacement runs $4,130–$8,850 depending on whether your home needs new ductwork. Most of our San Jose calls are completed same-day or next-day, including emergency response to neighborhoods from Communications Hill to Alum Rock. Call (844) 875-9451 for a free estimate.

Call (844) 875-9451

We’re Redwood Heating & Air, and our Heating & Furnace team makes the drive up from San Diego to serve San Jose homeowners stuck with legacy heating systems. Gregory Hahn founded this company and still leads every technical decision, bringing 13 years and 428 verified reviews to bear on the unique problems of Santa Clara Valley housing stock. San Jose isn’t like other markets. The 1950s–1970s tract-home boom left tens of thousands of properties with floor furnaces, wall heaters, and zero ductwork, because the valley’s mild Mediterranean climate made central forced air seem unnecessary. Now, with extreme heat events pushing past 100°F and California’s electrification mandates in force, those legacy systems are failing en masse. We’ve built our reputation on diagnosing these homes correctly the first time, not selling cookie-cutter replacements that ignore the structural reality of low-pitch attics and original gravity systems.

Why Redwood Heating & Air San Diego Is San Jose’s Preferred Heating & Furnace Company

San Jose customers find us after they’ve already been burned by a contractor who quoted a standard furnace swap without inspecting the attic. Gregory Hahn holds a Master Technician designation, and that credential is on the truck, not locked in a corporate office. When we arrive at a 1960s ranch near Berryessa or a 1970s duplex off Capitol Expressway, we know what we’re looking at before we open the crawl space.

Our 428 verified customer reviews average 4.6 stars, built continuously over 13 years of operation. That volume matters in a research-heavy market like San Jose, where homeowners read every review before calling. We’re certified to service nine major HVAC brands — Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard — so we stock parts and can repair what you already own rather than pushing a single product line.

Response time to San Jose averages same-day for emergency calls and next-day for scheduled service. We understand the urgency when a floor furnace cracks its heat exchanger in January, or when a wall heater’s gas valve fails on a night the Santa Clara Valley bowl traps cold air against the Diablo Range.

Our local knowledge runs deep. We know the 95110–95112 corridor is dominated by post-WWII stucco ranches with original gravity systems. We know the blown-in insulation added in the 1980s complicates attic retrofits. And we know California’s Title 24 now requires heat-pump-or-justify documentation for every permitted furnace replacement in San Jose, a conversation most out-of-state contractors have never had.

Our Heating & Furnace Services in San Jose

Furnace Repair

Most San Jose furnace repair calls we receive involve legacy systems: a 1960s floor furnace in Alum Rock with a cracked heat exchanger, a 1970s wall heater in East Foothills with a failed gas valve, a pilot light that won’t stay lit on a unit whose OEM parts were discontinued decades ago. Our repair range of $175–$825 covers diagnostics, parts, and labor for the majority of these calls. Because we carry factory-authorized parts for Trane, Lennox, Goodman, and Rheem, we can often complete the repair in a single visit rather than ordering components and leaving you without heat.

The housing stock in central San Jose complicates repairs. Original floor furnaces sit in concrete pits with rusted housings. Wall heaters in duplexes share venting with adjacent units. We diagnose the full system, not just the symptom, because a “simple” ignitor replacement on a 40-year-old unit often reveals deeper problems with combustion safety.

Furnace Replacement

Full furnace replacement in San Jose runs $4,130–$8,850, with the wide range reflecting whether your home needs complete ductwork installation. This is where San Jose diverges dramatically from neighboring markets. Unlike in Fresno or Sacramento, where central forced air was standard from the start, San Jose’s 1950s–1970s tract homes often had no ducts at all. Our furnace retrofits here routinely involve cutting into low-pitch attics to design custom duct systems from scratch.

We recently replaced a 1960s floor furnace in a San Jose ranch home on the 95110 corridor near Alum Rock with a high-efficiency Carrier gas furnace. The old gravity system had no ductwork, so we ran new supply and return ducts through the low-clearance attic, navigating 1980s blown-in insulation. The homeowner selected a variable-speed model to handle extreme summer peaks and mild evenings.

California’s Title 24 and the state’s 2023 building-code electrification push mean that any permitted HVAC replacement in San Jose now triggers a heat-pump-or-justify requirement from the city’s Building Division. Techs who can walk a homeowner through the PG&E EV2-A time-of-use rate schedule alongside a heat-pump ROI calculation win the job; those who only sell gas furnace swaps are losing permitted work to competitors who’ve mastered the paperwork. We do both, and we explain which path makes sense for your specific home and energy usage.

Furnace Tune-Up

Annual furnace tune-up in San Jose costs $95–$235 and pays for itself in efficiency gains and avoided emergency calls. For legacy systems especially, preventive maintenance catches cracked heat exchangers before they leak carbon monoxide, identifies gas valve degradation before complete failure, and cleans pilot assemblies that have accumulated decades of combustion residue.

San Jose’s geography matters for maintenance scheduling. The Santa Clara Valley bowl traps pollutants during offshore-flow events, and wildfire smoke seasons (typically August–October) have driven sharp demand for filtration upgrades. We inspect blower motors, test safety switches, and evaluate whether your system can handle MERV-13-and-above filtration retrofits without airflow restriction.

Heat Exchanger Inspection & Replacement

Cracked heat exchangers are the most dangerous failure mode we encounter in San Jose’s older housing stock. Original 1960s floor furnaces with cracked heat exchangers are no longer manufactured, forcing full replacement. We use combustion analyzers and visual borescope inspection to confirm cracks, and we show homeowners the evidence before recommending any course of action. This is not a repair to delay. A compromised heat exchanger can leak carbon monoxide into living spaces, and San Jose’s tighter modern homes trap that gas more effectively than the drafty originals.

Trusted Brands We Service in San Jose

We service, repair, and install equipment from nine major HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For San Jose customers, this multi-brand fluency means we stock common parts locally and can repair what you already own rather than defaulting to replacement. We see a lot of Lennox and Trane in the Communications Hill area’s newer construction, and Goodman and Rheem in the replacement market across Alum Rock and East Foothills. Our technicians are factory-trained or field-experienced across all nine lines, so the diagnosis is brand-accurate, not generic guesswork. Fast turnaround matters when San Jose’s winter nights drop into the 40s and your wall heater fails on a Friday evening.

Common Heating & Furnace Problems We See in San Jose Homes

• Cracked heat exchangers in 1960s floor furnaces. The original gravity systems in San Jose’s post-WWII ranches were built to last 20–25 years. Many are now 60+ years old. The heat exchanger metal fatigues from decades of thermal cycling, and once cracked, the unit cannot be repaired safely. Replacement is the only option, and because these floor furnaces are obsolete, we design modern ducted systems from scratch.
• Discontinued gas valves in 1970s wall heaters. The duplexes and small apartment buildings from San Jose’s 1970s building boom often used wall furnaces with proprietary gas valves. Manufacturers stopped producing these parts years ago. We evaluate whether a compatible modern valve can be adapted, or whether the smarter long-term investment is retrofitting to a ducted or ductless system.
• Ductless mini-splits sized for single rooms in open-plan ranches. San Jose’s open-plan 1960s ranches seem ideal for ductless retrofits, but we’ve seen installations fail because the unit was sized for a single room while the open layout creates air mixing that the system can’t handle. Proper zoning design is critical, and sometimes a ducted solution serves the space better despite the higher upfront cost.
• Insulation-encased attic ductwork from 1980s retrofits. When San Jose homeowners added blown-in insulation in the 1980s, contractors often buried existing flex duct. Over decades, the compressed duct loses airflow capacity, and the insulation traps moisture against metal fittings. We uncover and evaluate these hidden systems during every replacement consultation.

Pricing for Heating & Furnace in San Jose, CA

We Also Serve Cities Near San Jose

Our service radius includes Communications Hill, Alum Rock, East Foothills, and Campbell. Whether you’re in a hillside home above the 280 corridor or a valley-floor ranch near the original Winchester district, we make the drive with parts stocked for same-day resolution.

FAQs — Heating & Furnace in San Jose