The short answer
PerfectFix HVAC Services repairs gas furnaces in Los Altos Hills (94022), diagnosing problems like failed ignitors, dirty flame sensors, blower issues, and airflow restrictions. Current Bay Area Air District rules do not require you to replace a working furnace, so repairing a sound unit is often a reasonable choice.
Winters in Los Altos Hills are mild by most standards, but damp nights in the foothills still keep furnaces running from late fall into early spring. When yours stops heating, shuts off too soon, or starts making new noises, PerfectFix HVAC Services sends a technician from our base in San Jose, about 16 miles east, to find the cause and fix it. This page covers the furnace problems we commonly see, what a repair visit looks like, and how current Bay Area rules affect the choice between repairing and replacing.
Why Furnaces in Los Altos Hills Act Up
The Santa Clara Valley has dry summers and mild, damp winters, so most furnaces here sit idle for months and then run hard once the weather turns. That pattern causes a predictable set of problems. Dust settles on burners and flame sensors over the summer, filters get forgotten, and parts that worked fine last spring fail on the first cold night.
Homes in hilly areas often have furnaces in attics, crawlspaces, or garages with long duct runs to distant rooms. Larger homes may have more than one system or zoned ductwork. These setups are not a problem in themselves, but they make airflow issues, leaky ducts, and uneven heating more likely, and they affect how we diagnose a complaint like one cold bedroom.
Furnace Problems We Repair
Most furnace calls come down to a handful of components. We test each one rather than guessing, so you pay for the part that actually failed.
- Furnace won't ignite or lights and then shuts off (ignitor, flame sensor, or gas valve issues)
- Short cycling, where the furnace turns on and off every few minutes
- Blower runs constantly or not at all
- Weak airflow or cold rooms caused by clogged filters, blocked returns, or disconnected ducts
- Loud banging, squealing, or rattling from the burners or blower
- Error codes flashing on the control board
- Pressure switch and inducer motor faults
- Thermostat wiring or settings that keep the furnace from responding
What Happens During a Repair Visit
We start by asking what you've noticed: when the problem began, whether it happens every cycle, and any sounds or smells. Then the technician works through the system in order so nothing gets missed.
- Check the thermostat, power, and filter first, since these cause many no-heat calls
- Read any control board error codes and watch a full heating cycle
- Test the ignitor, flame sensor, safety switches, and gas pressure
- Inspect the blower, inducer motor, and wiring
- Look at the venting and heat exchanger area for signs of a safety concern
- Explain what we found and the repair options before doing the work
Repair or Replace? What Bay Area Rules Mean for You
Many homeowners have heard about new Bay Area Air District rules for gas appliances. Here is what matters for a furnace repair. The rules do not require you to replace working equipment. They apply only when an existing furnace fails or is replaced, so fixing a furnace that is otherwise in good shape is still an option.
Looking ahead, natural gas furnaces manufactured from 2029 must meet a zero-NOx emission standard. In practice, that points homeowners toward heat pumps when a furnace is replaced after that date. If your furnace is older and needs a major repair, it can make sense to weigh that cost against planning for a heat pump.
If you are considering a heat pump, note that the federal 25C tax credit only covered qualifying heat pumps placed in service before December 31, 2025, so it is not available for new installations. BayREN and your local clean energy provider may offer heat pump and electrification incentives, but amounts change by funding cycle, so we confirm the current offer before including it in any estimate.
When to Shut the Furnace Off
Some symptoms call for turning the furnace off and calling right away. If you smell gas, leave the house and contact your gas utility from outside. If a carbon monoxide alarm sounds, get everyone outside and call for help. A burning electrical smell, scorch marks near the furnace, or a yellow, flickering burner flame also mean the unit should stay off until it is inspected.
Serving Los Altos Hills and Nearby Communities
We provide furnace repair throughout Los Altos Hills in the 94022 ZIP code and across Santa Clara County. Our technicians also work regularly in Los Altos, Mountain View, Cupertino, Sunnyvale, and Saratoga, so we know the mix of older and newer homes in this part of the valley. When you call, let us know where the furnace is located and what it is doing, and we will plan the visit accordingly.
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