The short answer
ComfortFlow repairs gas furnaces and heat pumps in Los Altos, starting with a full diagnosis so you know the cause before any work begins. Bay Area Air District rules don't require you to replace a working furnace, so a sound system is usually worth repairing. If replacement does make sense, we explain the options, including heat pumps.
When your heat quits on a damp winter night in Los Altos, you want the problem found and fixed, not a sales pitch. ComfortFlow HVAC Contractor repairs gas furnaces, heat pumps, and the ductwork and controls that connect them for homes in the 94024 ZIP code and the rest of Los Altos. We're based in San Jose, about 18 miles away, and we also serve Mountain View, Sunnyvale, Cupertino, Santa Clara, and Saratoga. This page covers what usually goes wrong with heating systems here, how we approach a repair, and how current Bay Area rules affect the choice between repairing and replacing.
Why Los Altos Heating Systems Fail When They Do
The Santa Clara Valley has a Mediterranean climate with dry summers and mild, damp winters. Many Los Altos homes run the heat for only a few months a year, so a furnace can sit unused from spring through fall. That long idle stretch is when problems build up without anyone noticing. Dust settles on burners and sensors, filters stay in place too long, and parts that were wearing out last winter don't show it until the first cold morning.
Heat pumps work differently. They often run year-round for both cooling and heating, so wear accumulates steadily. Damp winter weather can also be hard on outdoor equipment and electrical connections.
- Furnace runs briefly and then shuts off (often a dirty flame sensor or an overheating problem)
- Igniter or pilot fails, so the burners never light
- Blower runs but the air coming out of the vents is cool
- Heat pump blows lukewarm air or gets stuck in defrost
- Thermostat doesn't call for heat, or the system won't turn off
- Rattling, squealing, or booming noises at startup
- Musty or burning smell, beyond the normal dust burn-off on the first cold day
How We Handle a Heating Repair
Every call starts with a diagnosis, not a guess. On a furnace, we check the thermostat and wiring, ignition, flame sensor, gas pressure, venting, blower, limit switches, and the control board's error codes. On a heat pump, we look at refrigerant performance, the reversing valve, defrost controls, capacitors and contactors, and the airflow through the indoor unit.
Before any work begins, we explain what we found, what it will take to fix, and whether anything else looks close to failing. If a problem raises a safety concern, such as a cracked heat exchanger or a venting issue that could let combustion gases into the house, we'll show you what we're seeing and tell you plainly why it matters.
Many Los Altos homes have equipment in tight attics, crawlspaces, or closets. We'll ask where your unit is when you call so the technician arrives ready for the space.
Repair or Replace? What the Bay Area Rules Mean for You
Homeowners often ask whether new air quality rules mean they have to get rid of their gas furnace. They don't. The Bay Area Air District's appliance rules don't require replacing equipment that still works. They apply only when an existing furnace or water heater fails or is replaced.
The rules do affect long-term planning. Under the Air District's Rule 9-4, natural gas furnaces manufactured from 2029 on must meet a zero-NOx emission standard. In practice, that points homeowners toward heat pumps when they replace a furnace after that date. If your furnace is healthy and the repair is reasonable, fixing it usually makes sense. If it's older and needs repeated or major repairs, it may be worth weighing a heat pump now, on your own schedule, instead of during an emergency later.
We'll give you an honest read on your system's condition and leave the decision to you.
Incentives and Tax Credits: What's Current
The federal Energy Efficient Home Improvement Credit (25C) covered qualifying heat pumps placed in service before December 31, 2025. It isn't available for installations after that date, so be wary of any older advice that still mentions it.
Bay Area homeowners can 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.
- Federal 25C credit: ended for new installations after 2025
- Regional and local programs: check BayREN and your clean energy provider
- Water heaters: the Rule 9-6 zero-NOx date for small water heaters was set for 2027, and the Air District is considering amendments that could delay it, so check the current rule before planning
More services in Los Altos
- AC Repair in Los Altos
- Heat Pump Installation in Los Altos
- AC Installation in Los Altos
- Furnace Repair in Los Altos