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Furnace Repair in Los Gatos, CA

The short answer

SwiftAir Conditioning Repair diagnoses and repairs gas furnaces in Los Gatos (95030, 95032) and nearby towns. Bay Area Air District rules do not require you to replace a working furnace, so repairing a sound unit is often a sensible choice. If you face a major repair on an older furnace, we can help you decide whether a heat pump makes more sense.

Los Gatos winters are mild, but the cool, damp nights from late fall into early spring mean most homes in town still rely on a furnace. When yours won't start, shuts off too soon, blows cold air, or starts making new noises, SwiftAir Conditioning Repair sends a technician from our San Jose base, about 11 miles north, to homes in the 95030 and 95032 ZIP codes. This page covers the furnace problems we see most in Los Gatos and how we diagnose them. It also explains how to weigh repair against replacement under current Bay Area Air District rules.

Common Furnace Problems in Los Gatos Homes

The Santa Clara Valley has a Mediterranean climate with dry summers and mild, damp winters. Because of that, many furnaces sit idle for months and then run hard during the first cold stretch of the season. Dust settles on burners and flame sensors over the summer, and filters get forgotten. Parts that seemed fine in spring can fail on the first startup in fall.

These are the problems Los Gatos homeowners call us about most often:

  • The furnace clicks but never lights, or it lights and shuts off within seconds. This often points to a dirty flame sensor or an ignition problem.
  • The blower runs, but the air coming from the vents is cool or lukewarm.
  • The furnace short cycles, turning on and off every few minutes without warming the house.
  • A burning smell on startup lasts well beyond the first several minutes.
  • The unit rattles, squeals, or makes a booming sound when the burners light.
  • The thermostat calls for heat and nothing happens at all.
  • Some rooms or floors stay noticeably colder than others.

How a Furnace Repair Visit Works

We diagnose the problem before recommending any repair. A typical visit starts with the basics: thermostat settings and wiring, the air filter, power to the unit, and gas supply. From there, the technician watches the furnace go through its full startup sequence. That sequence covers the inducer motor, pressure switch, igniter, flame sensor, burners, limit switches, and blower motor.

We also look at the venting and check the heat exchanger where it can be seen. A cracked heat exchanger or a venting problem is a safety issue, not just a comfort issue. Before any work begins, we explain what we found in plain terms and walk you through your options. Then you decide how to proceed.

If you smell gas at any point, don't try to troubleshoot the furnace. Leave the house and contact your gas utility or emergency services from outside.

Repair or Replace? What the Air District Rules Mean for You

Many Los Gatos homeowners have heard about new Bay Area Air District rules and wonder whether they need to replace their gas furnace. The short answer is no. The rules do not require you to replace working equipment. They apply only when an existing furnace fails or is replaced.

Under Rule 9-4, natural gas furnaces manufactured from 2029 on must meet a zero-NOx emission standard. In practice, this points homeowners toward heat pumps when they replace a furnace after that date. If your furnace is in good shape and needs a routine repair, such as an igniter, flame sensor, or blower capacitor, fixing it is usually the practical choice. If it's older and facing a major repair like a heat exchanger, it's worth asking whether your next system should be a heat pump.

On incentives: the federal Energy Efficient Home Improvement Credit (25C) applied only to qualifying heat pumps placed in service before December 31, 2025. It isn't available for new installations after that date. Bay Area homeowners can still check BayREN and their local clean energy provider for current heat pump and electrification incentives. Amounts and availability change with each funding cycle, so we confirm the current offer before including it in any quote.

Quick Checks Before You Call

A few simple checks can save you a service visit. They're safe for any homeowner, but leave the burner compartment and gas connections to a technician.

  • Make sure the thermostat is set to Heat, set above room temperature, and has fresh batteries if it uses them.
  • Look at the air filter. A badly clogged filter can cause the furnace to overheat and shut itself off.
  • Confirm that the furnace's power switch, which often looks like a light switch near the unit, is on, and that the breaker hasn't tripped.
  • Check that the furnace's front panel is fully seated. Many units won't run if the door safety switch is open.
  • Make sure supply vents and return grilles aren't blocked by furniture or rugs.

Serving Los Gatos and Nearby Towns

We work throughout Los Gatos and nearby parts of Santa Clara County, including Monte Sereno, Campbell, Saratoga, Cupertino, and Santa Clara. The southern and inland parts of the valley run noticeably hotter in summer than areas near the Bay. If your home has central air or a heat pump alongside the furnace, we can look at the whole system on the same visit.

More services in Los Gatos

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What to expect

How a visit goes

  1. Clear answers before work begins

    We show you what's wrong, explain your options, and let you decide. Work starts after you approve it.

  2. Repair first when it's reasonable

    Not every problem calls for new equipment. If a repair will keep your system running well, we'll recommend that instead of a replacement.

  3. Equipment that fits your home

    When you do need a new system, we size it for your home, your ductwork, and how hot your part of the valley gets. We don't simply match the old unit's label.

FAQ

Common questions

Why does my furnace smell like burning when I first turn it on?

Dust that collects on the burners and heat exchanger over the summer burns off during the first few heating cycles. A faint smell that fades within the first several minutes is common. If the smell lingers, is strong, or smells electrical, turn the furnace off and have it checked.

My furnace runs, but the air from the vents is cold. What's wrong?

Common causes include a failed igniter, a dirty flame sensor that shuts the burners off, an overheating shutdown from a clogged filter, or a gas supply problem. The blower can keep running even when the burners aren't lit, so the vents blow unheated air.

Does the Bay Area Air District require me to replace my gas furnace?

No. The Air District's appliance rules do not require replacing working equipment. They apply only when an existing furnace fails or is replaced. Under Rule 9-4, gas furnaces manufactured from 2029 on must meet a zero-NOx standard.

Should I repair my furnace or switch to a heat pump?

If the furnace is in good condition and the repair is routine, repairing it is usually reasonable. If it's older and needs a major repair, a heat pump may be worth considering, especially since replacement furnaces will face the zero-NOx standard from 2029. We'll lay out both options so you can compare them.

Is the federal tax credit for heat pumps still available?

No. The federal 25C credit covered qualifying heat pumps placed in service before December 31, 2025, and doesn't apply to new installations after that. Check BayREN and your local clean energy provider for current local incentives. We confirm the current offer before quoting it.

Do you serve areas near Los Gatos?

Yes. Along with Los Gatos (95030 and 95032), we serve Monte Sereno, Campbell, Saratoga, Cupertino, and Santa Clara from our base in San Jose.

Need Heating or Cooling Help in San Jose?

Tell us what your system is doing, or not doing, and we'll set up a visit to find the cause and walk you through your options.

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