Furnace Installation & Replacement in Santa Clara & the Bay Area

Nothing structural — "replacement" is the same job as "installation," viewed from the old unit's side. Replacement means the old furnace comes out and the new one goes in: haul-away of the old unit, connecting to existing ductwork and gas lines, permit, inspection, and safety testing. People search both terms for the same service, and EVS quotes both the same way — written, line-itemed, final-price-is-the-price.

We remove and dispose of it — included in the quote, not an add-on line. The old unit is disconnected, hauled out, and hauled away. If it's in a tight closet, attic, or crawlspace, getting it out safely is part of the job. Your quote lists old-unit removal as its own line item so you can see it's covered.

Often, yes — but we verify it before promising. The first things we look at are return-air size and overall airflow capacity: you can install very good equipment and still have a system that underperforms because it can't move enough air. Older homes often have mixed ductwork — we've seen jobs where the crawlspace ducts were usable but ducts running through walls created problems. In those cases we keep the good sections, properly cap and abandon the sections we don't, and install new ductwork where needed. That assessment happens at the site visit, before the quote — not as a surprise after we start.

The short version: verify what's there, size the new unit, install, prove it's safe. We inspect the existing setup (furnace location, ductwork condition, gas line, venting, electrical), run a Manual J load calculation instead of sizing by square footage, pull the permit with your city, remove the old furnace, set and connect the new one, then test combustion safety and airflow at every register before we call it done. The full step-by-step is in Our Process below — including the part homeowners never see: confirming the furnace, coil, and any other matched components are an AHRI-certified combination, which the permit requires.

Most residential furnace replacements are completed in one day. Complex installations (venting modifications, gas line upgrades, ductwork changes) may take 1-2 days.

A good rule of thumb: if the repair costs more than half the price of a new furnace, or if your furnace is over 15 years old, replacement is usually the better investment. EVS can give you a straight answer — we do both repair and replacement.

A typical gas furnace replacement — like-for-like swap with old-unit haul-away, permit, and labor included — runs $4,500–$6,500 installed. Jobs that need venting upgrades, gas-line resizing, or ductwork modifications cost more, and we itemize every one of those lines before you commit. Diagnostics are free, so if you're not sure the furnace needs replacing, we'll give you a straight answer before you spend a dollar on a new unit.

AFUE (Annual Fuel Utilization Efficiency) measures how efficiently a furnace converts gas to heat. For Bay Area homes, 80% AFUE is the minimum. 90-96% AFUE is common for replacements. Higher efficiency means lower gas bills but higher upfront cost.

We install furnaces year-round. Since gas furnaces don't require electricity to produce heat (just to run the blower fan), they remain a popular choice for Bay Area homes concerned about PG&E power shutoffs. A backup battery or generator can keep the blower running during an outage.

Yes. Santa Clara, San Jose, Sunnyvale, and all Bay Area cities require permits for furnace replacement. EVS handles this — we pull the permit, schedule the inspection, and ensure the installation meets current code.

A properly installed and maintained gas furnace typically lasts 15-20 years. High-efficiency models with variable-speed blowers may last longer. Regular maintenance (annual tune-ups) extends lifespan.

Yes. If you need both, a combined installation saves on labor and coordination. We can quote the package as one job.

EVS Mechanical installs Carrier, Bryant, Goodman, Daikin, and Lennox gas furnaces. We'll recommend the brand that fits your budget and efficiency goals.

Yes. We provide ongoing maintenance and repair for every furnace we install. Local service team — not a warranty call center.

A gas furnace burns natural gas in a combustion chamber, creating heat. The heat exchanger transfers this heat to air without mixing combustion gases with your home's air. The blower fan pushes the warmed air through your ductwork to each room. Exhaust gases vent outside through a flue pipe. Modern furnaces use electronic ignition (no pilot light) and modulating burners for efficiency.

No — while gas provides the heat, your furnace needs electricity to run the blower fan, ignition system, and thermostat. During a PG&E power shutoff, the furnace won't operate unless you have a backup generator or battery system. The blower fan is the main power draw — a portable generator (2000-3000 watts) can keep most furnaces running.

Repair if: the furnace is under 10 years old, it's a single component (thermostat, flame sensor, blower motor), and repair cost is under $800. Replace if: the furnace is 15+ years old, the heat exchanger is cracked (safety issue), you need frequent repairs, or repair cost exceeds 50% of replacement. EVS gives honest repair-vs-replace advice.

A central heating system heats your entire home from one location (furnace, boiler, or heat pump) and distributes warm air or water through ductwork or pipes. Most Bay Area homes use forced-air central heating — a gas furnace heats air that's pushed through ducts to each room. It's called "central" because one unit serves the whole house.

Look for California C-20 HVAC contractors with local addresses (not call centers), verified reviews, upfront pricing, and fast response times. Check cslb.ca.gov to verify licenses. Ask about diagnostic fees, warranty on repairs, and if they stock parts locally. EVS offers 1-2 hour callbacks and honest repair-vs-replace guidance.

Modern furnaces are 90-96% efficient vs. 60-70% for units from the 1990s. You'll see lower gas bills (20-30% savings), quieter operation, better temperature control, improved safety (no pilot light, sealed combustion), and eligibility for Bay Area energy rebates. Plus, you avoid emergency breakdowns during cold snaps.