Fast, Reliable Heating & Furnace Across Hillsborough
Heating and furnace service in Hillsborough means working on custom estates, not tract homes. We’re Redwood Heating & Air, and our Heating & Furnace team has spent 13 years diagnosing systems in the kind of legacy properties that define this city. If your furnace quits on a January morning or your heat exchanger is showing cracks, we can usually get a technician to your Hillsborough home the same day. Call (844) 875-9451 for a free estimate.
Hillsborough’s hillside position above the San Francisco Bay creates real heating challenges. Upper-slope properties on the western ridgeline sit in maritime fog shadow and can run 10–15°F warmer on summer afternoons than lower bay-adjacent neighborhoods, so cooling load calculations shift significantly by elevation even within the same ZIP code. Winters are mild but damp, which means humidity management and preventing condensation in partially finished basements and wine cellars is a recurring service call for us.
Why Redwood Heating & Air San Diego Is Hillsborough’s Preferred Heating & Furnace Company
Gregory Hahn founded this company and still leads every technical decision. That matters in Hillsborough, where a furnace replacement isn’t a swap-out — it’s a retrofit into custom architecture with plaster walls, coffered ceilings, and mechanical rooms built for equipment standards that stopped existing decades ago.
Our 428 verified reviews averaging 4.6 stars come from customers who’ve been burned by rushed repairs or one-brand-only dealers. They research before they call. They want a named expert behind the work, not a franchise dispatcher sending whoever’s available. Gregory holds a Master Technician designation, and that credential rides in the truck to every Hillsborough job.
We’re certified to service nine major HVAC brands — Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. This brand-agnostic fluency matters when your estate has a 30-year-old Rheem in the main house and a newer Lennox in the guest wing, or when you’re trying to match existing equipment without tearing out functional systems.
From a single mini-split to a full commercial system, we handle the scope Hillsborough properties demand. Response time to Hillsborough typically runs same-day for emergency calls, next-day for standard scheduling.
Our Heating & Furnace Services in Hillsborough
Furnace Repair
A typical furnace repair in Hillsborough runs $175–$825. Most calls we get here aren’t simple fixes. Original gravity furnaces from the 1920s–1950s have parts that are no longer manufactured. At a 1930s estate on Glenwood Road, we found the original furnace’s heat exchanger cracked beyond repair, with ductwork routed through a finished attic with plaster walls. We replaced it with a high-efficiency gas furnace, adding a mini-split for the detached pool house to meet the owner’s zoning needs, all while preserving the coffered ceiling in the main living room. Diagnosed right the first time means knowing when a repair is possible and when you’re throwing money at a system that’s reached its end.
Furnace Replacement
This is where Hillsborough gets complicated. San Mateo County’s all-electric reach code means that when you pull a major renovation permit — common given the active luxury remodel market here — a straightforward gas furnace replacement can trigger a mandatory heat pump upgrade under Title 24 compliance review. Technicians who don’t understand this threshold before quoting routinely lose the work or get caught mid-project. We check permit status before we quote. If you’re replacing a furnace in a 6,000 sq ft estate with multiple wings, we size for the actual load, not the square footage rule of thumb that works in Burlingame tract homes. Expect $4,130–$8,850 for full installation, with variance depending on ductwork condition and zoning requirements.
Furnace Tune-Up
A furnace tune-up in Hillsborough costs $95–$235. In this city, tune-ups often reveal ductwork leaks in finished attics or insulation degradation in runs that haven’t been accessible since the 1960s. We check heat exchanger integrity, gas valve operation, and ignition sequence — the three failure points we see most in aging Hillsborough systems. Annual service catches cracked exchangers before they leak carbon monoxide into living spaces with original plaster walls that can’t be opened easily for remediation.
Heat Exchanger Inspection & Replacement
Heat exchanger failure is the endgame for most Hillsborough furnaces. In gravity furnace conversions from the 1940s–1960s, the exchanger often outlasts every other component, then fails catastrophically. Replacement costs run toward the higher end of our repair range, and in systems over 20 years, we typically recommend full replacement. We don’t sell heat exchanger swaps on equipment that’s already past reasonable service life. That’s not caution — it’s math.
What happens when you call
- 1
A real person answersNo phone trees — you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Hillsborough
We service your brand, whether it’s the Trane that came with your 1990s renovation, the Lennox installed by the previous owner, or the Goodman running in the pool house. Our parts network covers Hillsborough with next-day availability for most components, and we carry common ignition modules, gas valves, and blower motors on every truck. For legacy systems where parts are obsolete, we fabricate custom solutions or engineer retrofits that preserve your home’s architecture. Rheem and Goodman equipment often offers the best value for estate outbuildings and secondary structures where full zoning isn’t cost-effective.
Common Heating & Furnace Problems We See in Hillsborough Homes
- Original gravity furnaces with obsolete parts. Systems from the 1920s–1950s used cast-iron heat exchangers and natural convection that can’t be replicated with modern components. We custom-fabricate where possible, but most owners eventually face full retrofit.
- Ductwork leaks in finished attics and plaster ceilings. Retrofit ducting from the 1960s–1980s degrades where it’s inaccessible. We use thermal imaging to locate leaks without opening walls, then seal from existing access points.
- Reach code surprises mid-renovation. Pulling a permit for what seems like a standard gas furnace replacement triggers Title 24 heat pump requirements. We verify permit scope before quoting to protect your timeline and budget.
- Uneven heating between main house and detached structures. Staff quarters, pool houses, and guest wings on the same parcel frequently need separate systems or mini-split additions that neighboring cities rarely encounter.
Pricing for Heating & Furnace in Hillsborough, CA
| Service | Price Range |
|---|---|
| Furnace Repair | $175–$825 |
| Furnace Tune-Up | $95–$235 |
| Furnace Installation/Replacement | $4,130–$8,850 |
What moves you within these ranges? Accessibility of your mechanical room, condition of existing ductwork, and whether permit triggers apply. Hillsborough’s estate properties add complexity: multi-zone requirements, preservation of architectural features, and the need to coordinate with other trades during renovations. We quote upfront, itemized, before any work begins. Call (844) 875-9451 for a free estimate — we’ll inspect your system and give you real numbers, not a phone guess.
We Also Serve Cities Near Hillsborough
Our service radius covers the full San Mateo County corridor. We regularly handle heating and furnace calls in Burlingame, where the housing stock mixes mid-century ranches with newer construction; Millbrae, with its airport-adjacent properties and noise-mitigation HVAC needs; San Mateo, including both downtown commercial and residential zones; and San Bruno, where hillside elevation creates similar microclimate challenges to Hillsborough. Each city gets the same Gregory Hahn-led technical standard, with pricing calibrated to local market conditions.
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 — Heating & Furnace in Hillsborough
Most 1950s gravity furnace controls can be repaired or replaced with modern equivalents, but we need to inspect the heat exchanger first. If the exchanger is cracked or the burner assembly is corroded, replacement becomes the only safe option. Call (844) 875-9451 and we’ll assess whether your system has another season in it or if it’s time to engineer a retrofit that preserves your home’s architecture.
San Mateo County’s all-electric reach code applies to major renovation permits, not equipment swaps in unpermitted work. If your project triggers Title 24 review, a heat pump becomes mandatory. We verify permit status before quoting so you don’t get surprised mid-project. Call (844) 875-9451 and we’ll coordinate with your architect or contractor to get the compliance path right from the start.
Multi-wing estates typically need zoned systems or mini-split additions for detached structures. We size each zone independently rather than forcing a single furnace to push air through duct runs that were never designed for that load. Call (844) 875-9451 for a load calculation and zoning proposal specific to your layout.
Yes, and this is a common call in Hillsborough’s damp winter conditions. We install dedicated humidity-controlled heating or integrate the cellar into your home’s zoning with precise temperature and moisture management. Call (844) 875-9451 — estimates are free, and we’ll spec a solution that protects your collection without over-conditioning the space.
Trane and Lennox offer the best zoning flexibility for large custom homes, with modulating gas furnaces and communicating thermostats that handle multi-zone demands. Goodman provides strong value for secondary structures where full feature sets aren’t cost-justified. We recommend based on your specific zoning plan, not a brand preference. Call (844) 875-9451 and we’ll walk through the options.
Written by Gregory Hahn, Owner at Redwood Heating & Air, serving Hillsborough and San Diego County since 2012.