The short answer
ReliableAir repairs furnaces in Palo Alto that will not light, cycle too often, blow cold air or make noise. Every visit includes a venting and carbon monoxide check, and Air District rules never require you to replace a furnace that works.
Palo Alto winters are mild by most standards, yet the mornings can be raw and foggy, and older homes with single-pane windows or thin insulation lose heat quickly. When the furnace stops working, the chill sets in faster than you might expect. ReliableAir HVAC Services repairs gas and electric furnaces throughout Palo Alto's 94301, 94303, 94304 and 94306 ZIP codes, about 11 miles west of our base in San Jose. Many furnaces we see here are tucked into crawlspaces, attics and closets of homes that have been remodeled several times, so we pay close attention to both the repair and the safety of the installation around it.
Furnaces in Palo Alto homes: where they hide and why it matters
Location affects how a furnace wears and how it gets repaired. Crawlspace furnaces in older Palo Alto houses deal with moisture and limited access. Attic units see heat in summer and cold in winter, stressing wiring, drain lines and flue connections. Closet units, common in mid-century homes, often have tight clearances and return-air paths that were altered in later remodels.
Our technicians are comfortable working in all of these spaces. We also check whether past remodeling changed the venting path, blocked combustion air, or reduced the clearance between the furnace and nearby materials, because those changes can affect safety as much as performance.
Common repairs
Most Palo Alto furnace problems trace back to a short list of components. Identifying which one failed is the core of the visit.
- Hot surface igniters that crack after many heating cycles
- Flame sensors with buildup that cause burners to shut off within seconds
- Draft inducer motors that are noisy or fail to start
- Pressure switches and their hoses that block ignition when cracked or wet
- Blower motors and capacitors that leave heat trapped in the cabinet
- High-limit switches tripping due to restricted airflow
- Control boards and thermostat wiring problems, including smart thermostat compatibility
Safety checks on every visit
A furnace repair is incomplete without making sure the appliance is safe to run. We inspect the heat exchanger for visible cracks or corrosion, confirm the flue is intact and properly connected, check for adequate combustion air, and measure carbon monoxide levels around the unit. Gas connections are leak tested where we have worked.
If we find something unsafe, we will show you, explain the risk, and recommend next steps. In serious cases, such as a cracked heat exchanger, we may advise shutting off the furnace until it is repaired or replaced.
Understanding Bay Area furnace rules
Palo Alto homeowners often ask whether new Air District rules mean their furnace must go. The short answer is no. Bay Area Air District appliance rules do not require replacing working equipment. They apply only when an existing furnace or water heater fails or is replaced.
What does change is the replacement landscape. Under Rule 9-4, natural gas furnaces manufactured from 2029 must meet a zero-NOx emission standard, which in practical terms favors heat pumps for replacements after that date. If your furnace is approaching the end of its useful life, we can help you plan, but we will not push you to replace a furnace that can be repaired.
When repair stops being the best value
We tell you plainly when repair is the smart move and when it is not. Signs that replacement deserves a look include a cracked heat exchanger, frequent repeat breakdowns, very old equipment with hard-to-find parts, and comfort problems that a repair will not fix. If you decide to replace, options include a new high-efficiency gas furnace, a heat pump, or a dual-fuel combination, and we explain the trade-offs for your specific home.
For heat pumps, the federal 25C credit ended for systems placed in service after December 31, 2025. BayREN and your local clean energy provider may have current incentives, which we verify before quoting.
Areas served
Along with Palo Alto, our furnace technicians cover Los Altos Hills, Los Altos, Mountain View, Sunnyvale and Cupertino. Tell us what the furnace is doing and where it is located in the house, and we will plan the visit accordingly.
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