Fast, Reliable Heating & Furnace Across Sunnyvale
Heating and furnace repair in Sunnyvale typically costs $175–$825, with most service calls completed same-day when you call (844) 560-6978. Our Heating & Furnace team knows the 94086, 94087, and 94089 zip codes inside out, from the original ranch tracts off El Camino Real to the newer mixed-use buildings near downtown. We’re based in San Jose, so we’re rarely more than 20 minutes from a Sunnyvale home when heat goes out on a January morning.
Marcus Feldman, our owner and Service Manager, has spent 19 years working on the exact furnace types that dominate this city: 1960s and 1970s gas furnaces in slab-on-grade ranches, many still running original fiberglass duct board through attics that hit 140°F in summer. That local pattern recognition matters. When we pull up to a home on South Mary Avenue or near Lakewood Park, we already know the likely duct layout, the common failure points, and whether Title 24 compliance will factor into the repair.
Why Crestview Heating & Air California Is Sunnyvale’s Preferred Heating & Furnace Company
Our 4.8-star average across 250+ reviews includes scores of Sunnyvale homeowners who found us after frustrating experiences with dispatch-only operations. They mention the same things: Marcus shows up, diagnoses the actual problem instead of pushing a generic fix, and explains why their 1972 Lennox or 1985 Carrier is behaving the way it is.
We’ve replaced furnaces on streets from Ponderosa Park to the Birdland neighborhood to the North Sunnyvale corridor near Moffett Field. That geographic spread means we’ve worked in the tight crawlspaces of 94089, the standard attics of 94087, and the newer mechanical closets of downtown 94086 condos. Each zone has different access constraints, different duct configurations, and different permitting paths through the City of Sunnyvale.
Response time matters when your furnace quits during a Bay Area cold snap. We keep common ignitors, gas valves, and heat exchanger inspection tools stocked for Sunnyvale calls, and our emergency HVAC service means you’re not waiting until Monday when the system fails Friday evening.
Our Heating & Furnace Services in Sunnyvale
Furnace Repair
Furnace repair in Sunnyvale runs $175–$825 depending on the component and accessibility. The most common calls we field involve failed ignitors in 15–25 year old units, gas valves that won’t open fully, and blower motors straining against degraded ductwork. In the Birdland area and other 94087 neighborhoods, we also see premature heat exchanger corrosion from coastal salt air that drifts inland on certain wind patterns. We don’t guess at the repair. We combustion-test, inspect with cameras, and give you the actual condition of your system before quoting work.
Furnace Replacement
A full furnace replacement in Sunnyvale typically costs $3,500–$7,500, with the upper end reflecting duct remediation or Title 24 compliance work. This is where Sunnyvale’s housing stock creates real complexity. Those 1950s–1970s tract homes were built with heat-only duct systems, and when homeowners later add AC, the original fiberglass duct board often can’t handle the static pressure demands of a modern variable-speed furnace plus evaporator coil. We’ve learned to assess the full system, not just swap the box. We replaced a 1965-era gas furnace and added central AC for a homeowner on South Bernardo Avenue in 94087. The Title 24 duct test revealed 40% leakage in the original fiberglass duct board, so we sealed all accessible joints with mastic and installed a new Carrier 96% AFUE furnace and 3-ton condensing unit, restoring comfort in that classic ranch layout.
Furnace Tune-Up
Annual furnace tune-ups in Sunnyvale cost $80–$200 and pay for themselves in avoided failures. Our tune-up includes combustion analysis, heat exchanger inspection, gas pressure verification, and blower amp draw testing. In Sunnyvale specifically, we also check for salt-air corrosion on burner assemblies and heat exchanger seams, particularly for homes west of Mathilda Avenue where marine influence is strongest. Catching that corrosion early can mean the difference between a $180 cleaning and a $4,000 replacement.
Heat Exchanger Inspection & Replacement
Cracked heat exchangers are a safety issue we don’t soft-pedal. In Sunnyvale’s coastal zone, we’ve seen heat exchangers fail prematurely in units as young as 12 years old when salt air accelerates metal fatigue. Our inspection uses visual borescope and combustion analysis, not just a flashlight glance. If replacement is needed, we factor in whether your existing duct system can support a modern high-efficiency unit, or if we’re looking at a broader system upgrade.
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 Sunnyvale
We service and stock parts for nine major brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. In Sunnyvale, we see a lot of aging Lennox and Carrier units from the 1980s and 1990s, plus newer Rheem and Goodman systems in recent remodels. Our factory training across all nine brands means we don’t turn away jobs because “we don’t work on that.” We carry common ignitors, flame sensors, and control boards for Sunnyvale’s most prevalent models, which keeps turnaround short when your heat quits.
Common Heating & Furnace Problems We See in Sunnyvale Homes
- Undersized duct static pressure choking new equipment. Original heat-only duct systems in 94086 and 94087 ranches weren’t designed for the added resistance of an evaporator coil. When AC gets retrofitted without duct upgrades, furnaces short-cycle or coils freeze up because air can’t move properly.
- Degraded fiberglass duct board failing Title 24 testing. After 50+ years in hot attics, original duct board leaks 25–40% on average. California Title 24 mandates duct leakage testing whenever cooling is added to existing forced-air systems, and most Sunnyvale vintage homes fail on first inspection, requiring sealing or full replacement before permit closure.
- Coastal salt-air corrosion on heat exchangers and burners. The same marine layer that keeps Sunnyvale mild in summer carries salt particulates that accelerate metal degradation. We see this most in furnaces 15+ years old located west of Mathilda Avenue or in the 94089 corridor nearest the Bay.
- Failed ignitors during first cold snap of season. Sunnyvale homeowners often don’t run heat for months. When they finally do, the thermal stress on a worn ignitor causes failure. It’s the most predictable emergency call we get, and it’s entirely preventable with annual tune-ups.
Pricing for Heating & Furnace in Sunnyvale, CA
| Service | Typical Range in Sunnyvale |
|---|---|
| Furnace Repair | $175–$825 |
| Furnace Replacement | $3,500–$7,500 |
| Furnace Tune-Up | $95–$235 |
| Heat Exchanger Inspection | $150–$350 (often bundled with repair) |
| Ignitor Replacement | $200–$450 |
| Gas Valve Repair/Replacement | $350–$700 |
What moves you within these ranges? Accessibility matters. A furnace in a tight attic crawlspace off Fremont Avenue takes longer than one in a standard garage closet. Parts availability matters too. We stock common components, but a failed control board for a 30-year-old unit may need sourcing. And system condition matters most. A furnace with a cracked heat exchanger in a home with failing duct board isn’t a simple swap, it’s a system redesign. We explain all this before you commit. Estimates are free. Call (844) 560-6978.
We Also Serve Cities Near Sunnyvale
Our service radius extends naturally to Mountain View along the Central Expressway corridor, Santa Clara to the east, Cupertino at the southern edge, and Los Altos to the west. Many of our Sunnyvale customers first heard of us through referrals from coworkers in those cities. The same housing stock patterns, the same Title 24 requirements, and the same coastal climate factors apply across this whole Silicon Valley band.
Serving Sunnyvale, CA — Our Local Coverage Area
We’re based in the Sunnyvale 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 Sunnyvale
Probably not on the first try. Original fiberglass duct board in 1950s–1970s Sunnyvale ranches typically leaks 25–40% after decades in hot attics, and California Title 24 requires passing a duct leakage test before permit closure on any AC retrofit. We budget for duct sealing or partial replacement in most Sunnyvale quotes now, so you’re not surprised mid-project. Call (844) 560-6978 and we’ll assess your specific attic layout.
Salt air accelerates corrosion on uncoated heat exchangers, burner assemblies, and ignition components, particularly in homes west of Mathilda Avenue or in 94089 near the Bay. We’ve seen heat exchangers fail at 12–15 years instead of the typical 20+ in inland locations. Our tune-ups include corrosion inspection, and we can recommend coated or stainless components when replacement time comes.
Your original duct system was engineered for heating-only airflow, and the added static pressure from an evaporator coil is choking the furnace. This is extremely common in Sunnyvale’s 1970s tract homes. The fix is duct modification, static pressure testing, and possibly upsizing the blower or adding bypass ductwork. We measure before we modify.
Yes. The City of Sunnyvale requires permits for furnace replacement, and inspections verify proper venting, gas line sizing, and combustion air. If you’re also adding or modifying ductwork, Title 24 compliance testing applies. We handle permitting as part of our replacement service, including scheduling inspections.
Yes. Even with Sunnyvale’s mild winters, months of non-use let dust accumulate and corrosion progress unseen. Our $95–$235 tune-up catches ignitor wear, heat exchanger cracks, and salt-air corrosion before they become emergency failures. Given that most Sunnyvale emergency calls happen during the first cold snap in November or December, annual service in early fall prevents the worst timing. Call (844) 560-6978 to schedule.
Ready to get your Sunnyvale home’s heating system properly diagnosed? Call Crestview Heating & Air California at (844) 560-6978 for a free estimate. Marcus Feldman, our owner and Service Manager, still manages jobs in the field, and we’ll give you straight answers about whether your furnace needs repair, replacement, or just honest maintenance to keep running through another Bay Area winter.
Written by Marcus Feldman, Owner at Crestview Heating & Air California, serving Sunnyvale and the greater San Jose area since 2005.