Furnace Repair in Sunnyvale, CA — Gas Furnaces, Eichler Radiant Heat, Same-Day

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.