The short answer
We repair gas furnaces in Palo Alto homes, including units in attics, crawlspaces and closets, and we check combustion safety on every call. When a repair is not worthwhile, we explain why and what replacement would involve, without pressure to remove working equipment.
A good share of Palo Alto's gas furnaces live in places nobody visits: a crawlspace hatch in a hallway closet, a cramped attic over the garage, a utility closet behind the laundry. Out of sight tends to mean out of mind, so by the time a furnace stops heating it has often been running for years with an old filter and no inspection. ExpertFlow HVAC Repair Service is about four miles from Palo Alto, in Los Altos, and we repair gas forced-air furnaces in 94301, 94303, 94304 and 94306. This page focuses on three things homeowners ask most: is it safe, can it be fixed, and is it worth fixing.
Question one: is my furnace safe to run?
Before anything else, our technicians look at the parts of a furnace that protect your household. That includes the vent connector and flue, the draft as the burners fire, the condition of the visible heat exchanger surfaces, flame appearance, and the safety switches that are meant to shut the furnace down if something goes wrong.
Older furnaces in confined crawlspaces and closets deserve extra care, because a disconnected vent or a cracked heat exchanger can allow combustion gases into the home. Make sure your house has working carbon monoxide alarms. If one sounds, leave the house and call emergency services, and if you smell gas, go outside and contact the gas utility before anything else.
- Rust flakes or soot around the burners or vent
- A flame that flickers, lifts off the burner or burns mostly yellow
- Headaches or stuffiness that improve when you leave the house
- A safety switch that trips again and again
Question two: can it be fixed?
Most of the time, yes. The bulk of no-heat calls in Palo Alto come down to a short list of components. A flame sensor coated with residue cannot confirm the burners lit, so the furnace shuts off after a few seconds. Hot surface igniters crack with age. Pressure switches and their tubing fail or fill with condensation. Inducer motors get noisy and then stop. Limit switches trip because a dirty filter or closed registers have choked off airflow.
We trace the sequence of operation from thermostat to blower, test each step with a meter rather than replacing parts on assumption, and confirm the repair over several complete cycles. Common parts are often on the truck, so many repairs are finished during the first visit.
Question three: is it worth fixing?
The answer depends on the furnace's condition, how often it has needed repairs, whether parts are still available and what the repair would cost relative to the remaining life of the equipment. A cracked heat exchanger on an old furnace is usually the end of the road. A failed igniter on a sound furnace almost never is.
If replacement makes sense, you have choices. Bay Area Air District Rule 9-4 requires gas furnaces manufactured from 2029 to meet a zero-NOx standard, which in practice points future replacements toward heat pumps. Those rules apply only when equipment fails or is replaced; a working furnace does not have to come out. For heat pump incentives, check BayREN and your local utility or clean energy provider, since offers change by funding cycle and we verify them before quoting anything.
Access matters in older Palo Alto houses
Crawlspace and attic furnaces take longer to service, and sometimes the access opening is smaller than the equipment that has to come through it. During a repair visit we will note anything that would make future service easier or safer, such as an attic walkway, a service light, a properly secured ladder or a clearer path to the filter. These are suggestions, not requirements, but they tend to lower the effort of every visit that follows.
Keeping the next winter uneventful
Palo Alto winters are mild but damp, and the heating season comes in stretches rather than a long freeze. That makes it easy to forget the furnace until the first cold evening. Replace filters on a regular schedule, keep storage boxes away from the furnace and its return air, and book a fall inspection so sensors, igniters and safety controls are checked while the weather is still pleasant. We also repair furnaces in Los Altos Hills, Mountain View, East Palo Alto, Atherton and Portola Valley.
More services in Palo Alto
- AC Repair in Palo Alto
- Heating Repair in Palo Alto
- Heat Pump Installation in Palo Alto
- AC Installation in Palo Alto
