The short answer
CoolVantage HVAC Service repairs gas furnaces in Los Gatos homes in ZIP codes 95030 and 95032, including ignition, airflow, and safety-control problems. Bay Area Air District rules do not require replacing a furnace that still works, so a sound repair is often the right choice for your system.
When the furnace quits on a cold, damp night in Los Gatos, you want it diagnosed correctly and fixed without guesswork. CoolVantage HVAC Service is based in San Jose, about 6 miles northeast of town, and we repair gas furnaces in homes across both Los Gatos ZIP codes, 95030 and 95032. This page covers the furnace problems we see most often here, how a repair visit works, and what current Bay Area Air District rules mean if your furnace is near the end of its life.
Furnace problems common in Los Gatos homes
The Santa Clara Valley has dry summers and mild, damp winters, so many Los Gatos furnaces sit unused for months and then run hard during the first real cold stretch. That stop-and-start pattern brings out problems that weren't noticeable in spring. Dust settles on burners and sensors, filters get forgotten, and small parts that were already wearing out fail all at once.
These are the issues we diagnose most often on Los Gatos service calls:
- Furnace runs briefly, then shuts off, often because of a dirty flame sensor or a limit switch tripping from restricted airflow
- No heat at all, caused by a failed igniter, a bad pressure switch, or a thermostat that isn't calling for heat
- Blower runs but the air coming out is cool
- Short cycling that wears parts and leaves some rooms colder than others
- Rattling, squealing, or booming sounds at startup
- A burning-dust smell that lasts well beyond the first few minutes of the season
What happens during a furnace repair visit
We start by asking what you've noticed: when the problem began, whether it happens every time, and whether there are any odd smells or sounds. Then the technician checks the thermostat, filter, and power before opening the furnace. From there, we test the ignition sequence, measure airflow and temperature rise, inspect the burners and flame, and check the safety controls that shut the furnace down when something is wrong.
Once we find the cause, we explain it in plain terms and tell you what the repair involves before we start work. If we spot something that isn't urgent but will need attention later, such as a worn blower motor or a corroded flue connection, we tell you so you can plan for it.
Repair or replace? What the Air District rules mean for you
Many Los Gatos homeowners have heard about new Bay Area Air District appliance rules and wonder whether they're required to replace their furnace. They aren't. The rules don't require replacing equipment that still works. They only apply when an existing furnace fails or is replaced.
Under Rule 9-4, natural gas furnaces manufactured from 2029 onward must meet a zero-NOx emission standard. In practice, that points homeowners toward heat pumps when they replace a furnace after that date. So if your furnace is in decent shape, repairing it is usually reasonable. If it is older and failing often, it's worth thinking now about whether your next system should be a heat pump.
If you're weighing a heat pump, note that the federal 25C tax credit only covered qualifying heat pumps placed in service before December 31, 2025, so it doesn't apply to new installations. BayREN and your local clean energy provider may offer heat pump and electrification incentives. Amounts and availability change with each funding cycle, so we confirm the current offer before we include it in a quote.
Safety warning signs: when to call right away
A gas furnace that isn't working right can be more than an inconvenience. Turn the furnace off and call for service promptly if you notice any of the following. If you smell gas, leave the house first and contact your gas utility from outside.
- Carbon monoxide alarm sounding
- Yellow or flickering burner flames instead of steady blue
- Soot or scorch marks around the furnace cabinet
- Headaches or nausea in the household that ease when you leave the house
Serving Los Gatos and nearby communities
Our technicians work throughout Los Gatos and the surrounding area, including Monte Sereno, Campbell, Saratoga, Cupertino, and Santa Clara. If you'd rather prevent a breakdown than react to one, a tune-up before the heating season gives us a chance to clean the burners and flame sensor, check the safety controls, and catch worn parts before the first cold night.
More services in Los Gatos
- AC Repair in Los Gatos
- Heating Repair in Los Gatos
- Heat Pump Installation in Los Gatos
- AC Installation in Los Gatos