Seasonal tune-up and full diagnostic on your Carrier, Trane, or Goodman system - readings shown to you before any repair is proposed
Diagnosis first, numbers second - you approve the repair price before a single part goes in.
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AfterFast, Reliable Furnace Repair Across Los Altos
Most furnace repair in Los Altos runs $150 – $700 and our Furnace Repair team can usually diagnose and fix the problem same-day. We dispatch from our San Francisco Bay Area office and keep common Lennox, Trane, and Rheem parts stocked for Los Altos calls, so you’re not waiting on a warehouse run while the house chills.
We know the local housing stock. Los Altos is thick with 1950s through 1970s ranch homes built for a milder Bay Area, with heating-only duct systems that weren’t designed for the loads these houses carry today. That matters when your furnace starts acting up. A tech who thinks every call is a standard part swap will miss the duct choking your blower motor. We’ve fixed enough systems off Almond Avenue, along Foothill Expressway, and in the South Los Altos hills to know the difference.
Call (984) 538-9003 anytime. A live person answers, 24 hours a day.
Why Brandt HVAC Is Los Altos’s Preferred Furnace Repair Company
Los Altos homeowners aren’t looking for the cheapest bid. They’re looking for certainty about who walks through the door and what happens next. Our Threshold Verified standard means you get a name, photo, and background-checked ID badge before anyone arrives. If the person at your door doesn’t match who we sent, that visit is on us and we make it right.
Every repair starts with a written price. No work begins until you see the number and agree. Every repair also carries a written 365-Day Done Right Promise: if it fails, we return at no charge. No argument, no additional fee.
Our phones are staffed by live people around the clock, not voicemail trees. Nights, weekends, holidays. When your furnace quits on a January night and the temperature’s dropping toward the 30s, you talk to a person who can dispatch help.
We’re part of the Threshold Group family, established in 2003. Each location is independently owned and operated, which means the crew serving Los Altos lives and works here, not dispatched from some distant corporate hub.
Heating Repair in Los Altos
Heating Repair in Los Altos covers everything from a failed ignitor in a 1980s Rheem to recommissioning a multi-zone system in a newly renovated ranch off Robleda Road. Because most local homes started life as heating-only, the ductwork behind your furnace often determines whether a simple repair actually fixes the problem or just masks a deeper airflow issue. We run static pressure tests and load calculations before we quote, so you know if you’re looking at a $200 ignitor or a $2,400 duct redesign.
When to Call for Heating Repair
Call when you hear banging or rattling from the cabinet, smell burning dust that doesn’t clear after the first cycle, or notice cold spots that weren’t there last season. In Los Altos, we also see a lot of calls after renovation projects where the new addition never gets warm. The thermostat reads 70 but the room sits at 62. That’s usually a duct capacity problem, not a furnace problem, and it takes a tech who understands local construction to spot it.
What Heating Repair Costs in Los Altos
Most heating repairs in Los Altos fall between $150 and $700, parts and labor included. A blower motor replacement on a standard furnace typically runs $400 – $650. An ignitor swap is simpler, usually $150 – $300. If we find your return trunk is undersized and killing the motor, we’ll show you the pressure readings and give you a written price for the ductwork before anything else happens.
Boiler Repair in Los Altos
Boiler Repair in Los Altos is less common than furnace work, but the homes that have them, have them for a reason. You’ll find hydronic systems in some of the custom builds and mid-century moderns tucked into the hills above El Monte Road, where radiant heat pairs better with open floor plans and extensive glass. When a boiler fails in one of these homes, it’s not just a heating problem. It’s often a controls problem: zone valves stuck shut, circulator pumps seized, or a tankless coil producing lukewarm domestic hot water.
Boiler Issues We Fix
We repair gas-fired boilers from major brands including Lennox and Weil-McLain. Common calls are no-heat zones, kettling noises from lime-scaled heat exchangers, and pressure loss indicating a leak in the loop. Los Altos water is moderately hard, so scale buildup is real. We descale, replace failed expansion tanks, and swap circulator pumps. Every repair gets the same written price upfront and the same 365-day guarantee.
When Boilers Make Sense Here
Boilers shine in homes with in-floor radiant or high-mass construction where forced air would fight the architecture. If you’re in a Los Altos hillside home with concrete floors and walls of glass, you probably already know. When that system breaks, you need a tech who understands hydronics, not just a furnace tech guessing at your zone valves. We send the right person.
Trusted Brands We Service in Los Altos
We service all major residential HVAC brands: Carrier, Trane, Lennox, Goodman, Rheem, York, Daikin, Bryant, and American Standard. For Los Altos customers, we keep common Lennox and Trane ignition modules, Rheem blower motors, and Goodman control boards on our trucks. That stock matters. When your furnace dies on a Saturday night and the temperature’s heading for frost, you don’t want to hear “we’ll order it Monday.” We also work with local suppliers in the South Bay for same-day pickup on less common parts. Most repairs finish in one visit.
Common Furnace Repair Problems We See in Los Altos Homes
- Short-cycling from undersized return ducts. The classic Los Altos failure. Your 1960s ranch has a gravity-return trunk sized only for heating airflow. The furnace runs, overheats, shuts off early, and your blower motor works itself to death. We measure static pressure and upsize the return when the numbers demand it.
- Cracked heat exchangers in original furnaces. Pre-1970s units show up on inspection reports as the hidden dealbreaker before a teardown or gut remodel. We flag it honestly. If you’re renovating, we’ll tell you whether a repair buys time or if the smarter money goes toward a new system sized for the house you’re building, not the house you bought.
- Zoning conflicts in multi-system homes. Los Altos has no shortage of large homes with Nest or Ecobee thermostats fighting manual dampers that were never properly commissioned after the remodel. The furnace runs, but rooms never settle. We recalibrate controls, test damper operation, and document setpoints so the system actually delivers what the architect drew.
- Blower motor failure from overwork. Inefficient duct design forces motors to run longer and harder. In a city where median home values push past $3 million, homeowners expect whisper-quiet operation. A failing motor often signals deeper airflow problems we trace back to the original 1950s duct layout.
Pricing for Furnace Repair in Los Altos, CA
We’re transparent about numbers because nobody likes surprise bills. Here’s what furnace work costs in the Los Altos market:
| Service | Price Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Furnace Tune-Up | $80 – $200 |
What moves you within that range? The part, mostly. An ignitor or flame sensor runs toward the low end. A blower motor or gas valve replacement sits higher. Duct redesign after a load calculation is a separate scope with its own written price. We don’t guess. We test, show you the readings, and give you one fixed number before any work starts.
Every estimate is free. Call (984) 538-9003 and we’ll schedule a diagnostic at your Los Altos home.
We Also Serve Cities Near Los Altos
Our crews work throughout the South Bay Peninsula. If you’re in Mountain View, Stanford, Palo Alto, or Portola Valley and need furnace help, we cover those areas too. Dispatch is coordinated from our San Francisco Bay Area office, with Los Altos served by local technicians who know the specific housing stock and climate conditions. Same Threshold Verified standard, same written pricing, same live-answer phones.
Serving Los Altos, CA - Our Local Coverage Area
We’re based in the Los Altos area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About Furnace Repair in Los Altos
Short-cycling after a tune-up usually means the root cause is duct capacity, not a dirty filter or worn part. Los Altos ranches from the 1950s – 70s were built with heating-only return trunks that are too small for modern airflow demands. We measure static pressure across the system; if the return is choking the furnace, upsizing the ductwork fixes the cycling and saves the blower motor. Call (984) 538-9003 for a free diagnostic with pressure testing.
Yes, but it typically requires more than just a smart thermostat. The original single-zone duct system was never designed for the load of a modern addition. We start with a Manual J load calculation, then determine whether your existing trunk can support dampers or if the addition needs its own air handler. We’ve zoned homes throughout South Los Altos and along Foothill Expressway. The key is matching the hardware to the actual duct capacity, not just the square footage.
Yes. We service and repair Carrier, Trane, Lennox, Rheem, and Bryant systems, and we stock common parts for faster turnaround. Los Altos remodels and teardown-rebuilds often specify these brands in premium or variable-speed configurations, so our techs train regularly on their control boards, modulating gas valves, and communicating thermostats. If your new system isn’t holding setpoint, we check commissioning first, not just parts.
A cracked heat exchanger is a safety issue that stops the furnace from operating, but it doesn’t automatically kill your renovation budget. If you’re planning a gut remodel or teardown-rebuild within two years, we’ll tell you honestly whether a basic repair buys time or if the smarter move is allocating budget to a new system sized for your finished home. We don’t sell equipment you don’t need, and we don’t patch dangerous conditions just to collect a check.
Most furnace repairs in Los Altos cost $150 – $700, and many problems are fixable without replacement. You’ll need a new system if the heat exchanger is cracked and the unit is past 15 – 20 years, or if your duct system is so undersized that no furnace can perform well without a full redesign. We give you a written price for both options when it’s close, so you decide with real numbers. Call (984) 538-9003 for a free estimate.
Ready to get your Los Altos home warm again? Call Brandt HVAC at (984) 538-9003. A live person will answer, verify your address, and dispatch a Threshold Verified technician with a written price in hand. No voicemail. No callback queue. No surprises.
Written by Devin Marlowe, Owner at Brandt HVAC, serving Los Altos and the South Bay.