Diagnostic visit (Sunnyvale)
Same-day where scheduling allows — about 10 minutes from our shop
Actual EVS work
Bay Area HVAC service
Furnace Repair in Sunnyvale, CA — Gas Furnaces, Eichler Radiant Heat, Same-Day
EVS Mechanical is based in Santa Clara, about 10 minutes from most Sunnyvale addresses. Same-day diagnostics for gas furnaces, wall furnaces — and the radiant-slab boilers in the Eichler tracts that don't have furnaces at all. Family-run, 5.0-star rated, no call centers.
CA Lic #1089826Licensed · Insured · BondedBased in Santa Clara — 10 minutes up the 101Same-Day & After-Hours Service
Furnace repair in Sunnyvale, CA — EVS Mechanical services gas furnaces in Sunnyvale's mid-century ranch tracts and the radiant-heat boilers in its 1,100+ Eichler homes (no furnace — a boiler in the closet). Same-day diagnostics from our Santa Clara shop, about 10 minutes away. Written estimate before any work. CA Lic #1089826. Call (408) 300-8254.
Fall: Sunnyvale's heating season is short but sharp — furnaces sit idle from spring through October, and the first rainy front is when the marginal ones quit. If yours was slow or loud last winter, a test run before the season beats a no-heat call during it.
What Is Furnace Repair in Sunnyvale?
Furnace repair in Sunnyvale covers diagnosing and fixing residential heating — but "furnace" means two completely different systems here, depending on your tract. Sunnyvale has the second-largest Eichler population in the Bay Area (roughly 1,100 homes across 16 tracts), and authentic Eichlers heat with hydronic radiant slabs — a boiler, no ductwork, no furnace. The mid-century ranch neighborhoods around them run conventional gas furnaces in attics and closets.
When to call about yours:
- The furnace won't light, or it clicks and clicks and never ignites
- It runs briefly, then shuts off (short cycling)
- The burner lights but the fan never blows — or blows cool air
- A burning smell at the first run of the season that doesn't fade
- Your carbon monoxide detector goes off near the furnace (shut the system off and call immediately)
- You smell gas — leave and call PG&E first, then us for the repair
- You're in an Eichler and the radiant heat is cold in spots, or the boiler won't stay lit
Who this is for: Homeowners and property managers across Sunnyvale — Lakewood, Ponderosa, Birdland, De Anza, Cherry Chase, the Heritage District, and the Eichler tracts in between.
What you get from an EVS install
We're 10 minutes away, and we come prepared for both Sunnyside systems.
Gas furnaces in the ranch tracts, hydronic boilers in the Eichlers — the tech who arrives knows which one your tract likely has before he rings the bell.
Honest advice on the Eichler conversion question.
Sunnyvale Eichlers used copper piping in the slabs, so the original radiant systems have often held up — which means "repair the boiler" and "add ductless" are both legitimate answers. We'll give you the math, not a sales pitch.
Written estimate before any work.
You approve the price before we touch the system. No surprise charges when the job is done.
Honest repair-vs-replace advice.
A cracked heat exchanger on a 20-year-old furnace is a safety replacement — we'll show you the reading and the numbers instead of selling you a new system.
Owner-accountable.
The family that runs EVS oversees every job. No call centers, no subcontractors, and the tech who diagnosed your system is the one who answers the follow-up call.
We're 10 minutes away, and we come prepared for both Sunnyside systems.
Gas furnaces in the ranch tracts, hydronic boilers in the Eichlers — the tech who arrives knows which one your tract likely has before he rings the bell.
Honest advice on the Eichler conversion question.
Sunnyvale Eichlers used copper piping in the slabs, so the original radiant systems have often held up — which means "repair the boiler" and "add ductless" are both legitimate answers. We'll give you the math, not a sales pitch.
Written estimate before any work.
You approve the price before we touch the system. No surprise charges when the job is done.
Honest repair-vs-replace advice.
A cracked heat exchanger on a 20-year-old furnace is a safety replacement — we'll show you the reading and the numbers instead of selling you a new system.
Owner-accountable.
The family that runs EVS oversees every job. No call centers, no subcontractors, and the tech who diagnosed your system is the one who answers the follow-up call.
Our Work
Real installs — our crew on every job
Gas furnace installed in closet alcove
Carrier outdoor condenser unit on pad
Bryant gas furnace in garage
TOSOT heat pump outdoor unit
Furnace on raised platform in utility closet
Air handler with insulated ductwork in attic
HVAC unit with ductwork in crawlspace
Furnace installation in garage
Garage HVAC system wide view
EVS technicians servicing a Lochinvar commercial rooftop unit
EVS technician working on commercial rooftop HVAC equipment
Two TOSOT heat pump units installed on a flat roof
New TOSOT heat pump installation on a flat roof
TOSOT inverter heat pump dual-fan condenser
TOSOT heat pump with EnergyGuide rating, rooftop install
TOSOT condenser unit secured on a flat roof
Completed rooftop heat pump installation, wide view
Air handler with new insulated ductwork installation
Pricing
Typical ranges for planning
Higher cost:
Emergency/after-hours, attic or closet equipment access, original ductwork needing sealing, gravity-era or wall furnaces needing specialty parts, heat exchanger failures pushing into replacement
Lower cost:
Flame sensor or ignitor replacement, easy equipment access, regular business hours, recent unit (warranty parts available)
Financing: Coming soon — call for current options.
Rebates: If a repair turns into a replacement or a ductless conversion, Sunnyvale homeowners may qualify for Silicon Valley Clean Energy programs, BayREN rebates, and TECH Clean California incentives.
Homeowner Proof
5.0
56 Google reviews
Clean work. Clear prices. People who answer after the install.
Customers remember the details: showing up, explaining the options, protecting the home, and standing behind the system later.
“We converted our home from a gas furnace to a full electric heat pump system and upgraded to a two-zone setup, giving each floor its own temperature control. EVS guided us through every step, explained our options clearly, and made a complicated project feel straightforward. The installation was clean and completed with a high level of craftsmanship — and their pricing was the most competitive of all the quotes we received.”
AOVerified
Aditya O.
Gas-to-heat-pump conversion, two zones · Bay Area
“Really impressed with EVS Mechanical — they earned every one of these five stars. The heat pump they installed has been incredibly efficient, and our energy bills have actually dropped. They showed up exactly when they said they would and were careful with our home during the installation. Would absolutely recommend EVS to anyone in the Bay Area.”
NVerified
Nate
Heat pump installation · Bay Area
“EVS Mechanical made what could have been a stressful process incredibly smooth. They diagnosed and repaired our HVAC system quickly and got everything running again. They didn't just do the work — they made sure we understood what was happening and why. Honest pricing, no upselling on things we didn't need. If you need HVAC work done right, call EVS Mechanical.”
MCVerified
Michael C.
HVAC repair · Bay Area
“I called EVS for a regular furnace service and they were here very quickly. They performed the service in one day and also discovered the very old condensate pump was not working properly causing water to pool around the furnace. They replaced the pump the next day. Would definitely use their services again.”
CHVerified
Christopher H.
Furnace service & repair · Bay Area
“Euler and his team were able to replace our 23 year old attic Carrier furnace after our existing unit's heating chamber failed. I called him at 10am, and he was at my house by 11am, diagnosed the issue and found a new replacement unit and had it installed by 4pm. Very friendly and great price too.”
BRVerified
Byron R.
Same-day furnace replacement · Bay Area
“We had a great experience with Euler at EVS Mechanical installing a heat pump heating and A/C system in our home. He was professional, knowledgeable, and easy to work with from start to finish. The installation was clean and efficient, and the system works beautifully. Highly recommend!”
AGVerified
Ani G.
Heat pump installation · Scotts Valley
“I had a great experience with Euler & Axel. They came promptly to check my AC issue and quickly assessed the problem. I really appreciated that I had already received a clear quote upfront, so there were no surprises. They also went above and beyond by helping with my dryer. Professional, reliable, and efficient.”
VRVerified
Varsha R.
AC repair · Bay Area
“EVS Mechanical is a great HVAC company! They were very professional, on time, explained everything and had a very competitive price. They found asbestos and we had to replace our entire furnace and duct work — it was done in a week. They filed the permits and handled everything. I highly recommend them.”
RYVerified
Rosalyn Y.
Furnace & ductwork · San Jose
“Excellent experience with Euler. Very professional, punctual, knowledgeable, and genuinely helpful. The installation was completed on time with an exceptionally clean job. Nearly a year after the installation, I contacted him about a repair issue. He fixed the problem without any hassle. Highly recommend.”
AAVerified
Aditya A.
Installation & follow-up repair · Bay Area
Frequently Asked Questions
Common failures — flame sensors, ignitors, thermostats, limit switches — are diagnosed and usually fixed the same visit; major repairs like blowers, control boards, and gas valves cost more and get a written estimate first. Every price is in writing before work starts.
Most don't — and that surprises people. Sunnyvale's 16 Eichler tracts heat with hydronic radiant slabs: a gas boiler in a closet, copper piping in the concrete, no ductwork anywhere. If your Eichler's heat fails, that boiler is what needs servicing. If you want cooling or a zoned modern system, the answer is usually ductless — and we quote that conversion with the Eichler design guidelines factored in.
It's a rule of thumb some companies use: multiply the furnace's age by the repair quote, and if it passes $5,000, lean toward replacement. It's a starting point, not an answer — a 12-year-old furnace with a cracked heat exchanger is a safety replacement no matter the math, and a 25-year-old with a dead ignitor can be a one-visit fix. We'll give you the real reading, not just the heuristic.
Three things: the filter (a clogged filter can overheat the furnace and trip its limit switch), the breaker, and the thermostat batteries or setting. If those check out — or you smell gas, which means leave and call PG&E first — call us and we'll be there the same day.
Treat it as real: shut the furnace off, open windows, get fresh air, and call us for an emergency visit. A cracked heat exchanger can leak combustion gas into the air stream — it's the single most common reason a 20-year-old furnace becomes a replacement, and no responsible company repairs around it.
Repairs, no. Replacements, yes — through the City of Sunnyvale Building Division, and California energy standards require high-efficiency condensing equipment for most gas furnace replacements. We pull the permit and schedule the inspection; it's part of the job, not an add-on.
All of them — Lakewood, Ponderosa, Birdland, De Anza, Cherry Chase, Fairbrae, the Heritage District, Sunnyvale West, and the Eichler tracts. We're based in Santa Clara, so most Sunnyvale addresses are about 10 minutes away.
No — and we won't pretend the two are the same thing. A real tune-up is an hour or more of a technician's time, plus gas, cleaning supplies, and a combustion and safety check; the $49–59 versions are priced below what the visit actually takes to perform. That's not a discount, it's a business model: those companies send a salesperson to your home, and the "tune-up" becomes the appointment where you're shown a five-figure replacement quote. EVS doesn't send salespeople — we send technicians who do the tune-up, hand you the condition report, and quote only the work your system actually needs. If a replacement makes sense, we'll show you the math — but because the numbers do, not because the visit has to pay for itself.
Bay Area Specifics
Sunnyvale's short season is exactly why furnaces fail here
Bay-side Sunnyvale is a few degrees cooler than San Jose, and winters rarely drop below 40°F — so furnaces idle from April through October, then get asked for full output on a cold December week. Dormant furnaces fail at ignition: flame sensors film over, ignitors wear, and the first cold night of the season produces the no-heat calls. A pre-season test run catches most of it.
The Eichler tracts: your "furnace" is a boiler
The 16 Eichler tracts (Sunnyvale Manor, Vanderbilt, Fairbrae, Rancho Verde, Midtown, and others) heat with copper piping embedded in the concrete slab — hydronic radiant heat, no ductwork, no furnace. Cold spots mean air in the loop, a zone problem, or a boiler on its way out. And because several tracts (Midtown, Fairbrae, Rancho Verde, Primewood) carry a Single-Story Overlay and Eichler Design Guidelines, any conversion to ductless heating needs placement thought before the permit set — we factor that in before quoting, not after.
Mid-century ranch tracts: original ducts and 100-amp panels
Ponderosa, Birdland, De Anza, Cherry Chase — 1950s–70s ranch homes with conventional gas furnaces, often on original or second-generation ductwork that leaks. If a furnace repair turns into a replacement conversation, the duct condition and the 100-amp panel are the two things that change the math, so we check both before quoting.
PG&E gas, SVCE electric
Sunnyvale runs PG&E for gas delivery and Silicon Valley Clean Energy for electric generation — a different incentive stack from Santa Clara's municipal SVP. If a repair turns into a heat-pump conversion conversation, the rebates come through SVCE and state programs; we confirm what applies during the estimate.
Permits
Furnace *repairs* don't need a permit. Furnace *replacements* in Sunnyvale do — through the City of Sunnyvale Building Division — and California's energy standards require high-efficiency condensing equipment for most gas furnace replacements. EVS handles the permit and inspection scheduling as part of the job.