Furnace & heating
AC repair
Heat pumps
Ductless mini splits
Carrier
Trane
GoodmanSeasonal 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.
Get your free estimateFast, Reliable Furnace Repair Across Los Altos
Furnace repair in Los Altos typically costs between $150 and $700, and most common fixes like ignitor replacements or capacitor swaps can be completed in a single visit. If your furnace is blowing cold air, short-cycling, or making a grinding noise from the blower, call us at (669) 800-4179 and a live person will answer, day or night. We know Los Altos homes better than most because we work on them every week, from the ranch houses off Fremont Avenue to the split-levels near Rancho San Antonio.
Key Takeaways
- Furnace repair in Los Altos runs $150 – $700, parts and labor included.
- Our 365-Day Done Right Promise comes in writing on every repair.
- HOA approvals and asbestos-era ducts often change the repair sequence here.
- We service Trane, Lennox, Goodman, and Rheem, among others.
- A live person answers our phone 24/7. No voicemail trees.
Styles & brands we work with
Why Cold Harbour Heating and Air San Jose Is Los Altos’s Preferred Furnace Repair Company
Cold Harbour Heating and Air has been fixing furnaces in Los Altos since 2003, and our technicians have crawled through enough of this city’s crawlspaces to know exactly what they’ll find before the flashlight even goes on. We’re an independently owned and operated member of the Kingswell network, which means we answer to one standard: the Kingswell Way. That’s a written price before work begins, a firm arrival window, a clean job site, and a guarantee that brings us back for free if a repair fails inside 365 days. Los Altos homeowners tend to ask harder questions than most, and we like that. It means they’ve been burned before, and they’re done with handshake promises.
Victor Mancini, who runs our operation, tells every technician the same thing before they head up Foothill Expressway: leave the house cleaner than you found it, and put the guarantee on paper before you leave. That’s not a slogan. It’s the way we’ve done it for two decades, and it’s why Los Altos customers keep our number in their phone.
Heat Pump Repair in Los Altos
Heat Pump Repair in Los Altos comes with a complication most cities don’t have: many of these systems were retrofitted into 1960s ranch homes that were never designed for them. We handle heat pump repair for $150 – $650, and the first thing our tech does is listen to how the system behaves at startup. In Los Altos, a heat pump that screams or rattles on a cold morning is often fighting an undersized duct system or a thermostat that was never recalibrated after installation. Heat pumps need to move more air than a standard furnace, and original low-velocity ducts from the 1950s and 1960s can’t always keep up. That’s when a simple repair becomes a bigger conversation, and we’ll give you the straight story with numbers before a single tool comes out.
Reversing Valve and Defrost Board Checks
On Los Altos winter mornings, a heat pump that blows cold air may just be stuck in cooling mode, and that usually points to the reversing valve. We test it under load, check the defrost board, and tell you exactly what needs to be replaced and what it costs before we touch anything.
Static Pressure and Airflow on Retrofitted Systems
Older Los Altos homes were built for heat-only furnaces. When a heat pump gets bolted on, static pressure climbs and the blower works harder than it should. We measure it, and if the numbers are off, we’ll tell you whether a repair will hold or whether you need ductwork addressed first.
Heating Repair in Los Altos
Heating Repair in Los Altos is not the same job as heating repair in a city with newer construction, because so many homes here still run on original gas furnaces that have been quietly failing for a decade. We repair gas furnaces for $150 – $700, and the range reflects reality: a thermocouple or ignitor is on the low end, while a heat exchanger or blower motor replacement lands at the top. Los Altos homeowners call us most often in January and February, when a cold snap drops into the 30s and the furnace picks that exact week to quit. The good news is that most repairs are same-day, and every one of them leaves with a written guarantee good for a full year. If the repair fails inside 365 days, we come back and fix it at no charge. Not a pro-rated charge. Not a service fee. Zero.
Heat Exchanger Inspection First
Before we replace any part, we run a combustion analysis and inspect the heat exchanger. This matters in Los Altos because so many furnaces are original from the 1960s and 1970s, and a cracked exchanger is both a safety risk and a repair-or-replace decision point.
Ignitor and Flame Sensor Repairs
When a Los Altos furnace clicks but won’t fire, it’s usually a dead ignitor or a dirty flame sensor. These are quick, low-cost fixes, and we keep common parts on the trucks that serve the Los Altos, Mountain View, and Palo Alto corridor.
Trusted Brands We Service in Los Altos
Our technicians are trained on nine major residential HVAC brands, and in Los Altos we see a lot of Trane, Lennox, Goodman, and Rheem equipment. Trane furnaces from the 1980s are still running in some of the older ranch houses near Springer Road, and Lennox units are common in the newer remodels downtown. Because we stock common parts locally, our Los Altos customers don’t wait days for a delivery from a regional warehouse. If the part is on our truck, we fix it that day.
Common Furnace Repair Problems We See in Los Altos Homes
- Asbestos-wrapped ducts complicate every repair. Many Los Altos homes built before 1975 have asbestos insulation around their ductwork in the crawlspace, which means a simple blower motor swap can become an abatement and replacement conversation. We check before we touch, and we’ll give you a written plan either way.
- Original 100-amp panels choke on modern equipment. A 1960s home off Covington Road might have a perfectly good gas furnace, but the panel can’t support a high-efficiency heat pump’s startup load. We identify this early so a furnace repair doesn’t turn into an expensive surprise.
- Low-velocity duct systems fight new blowers. The sprawling ranch homes around El Monte Road were designed for heat-only, low-velocity airflow. When a newer blower motor is installed, the static pressure changes, and the furnace can short-cycle or overheat. We measure airflow every time.
- HOA approval windows delay work. Los Altos has some of the strictest architectural review rules in Silicon Valley. If your furnace repair involves moving an outdoor unit or adding a condenser pad, the HOA often needs to sign off first. We’ll help you figure out the timeline before it becomes an emergency.
See the difference
Before
After
Before
After
Before
AfterThe Los Altos HOA Reality: What Changes the Order of Operations
Most furnace repair guides start with the furnace. In Los Altos, they should start with the HOA. This city has a patchwork of homeowner associations, and many of them regulate where outdoor equipment can sit, how loud it can be, and whether a condenser unit can be visible from the street. If a repair requires relocating a heat pump condenser, or swapping a gas furnace for a heat pump that needs a new pad, the approval process can take weeks. We’ve seen Los Altos homeowners left without heat in January because the outdoor unit was never pre-cleared and the HOA board meets once a month. The Kingswell Way says to plan before the repair, not after. We’ll walk you through it.
On a 1960s ranch off Fremont Avenue, our tech found a Carrier furnace short-cycling due to a failed capacitor and low refrigerant charge. After a five-minute test confirmed the capacitor, we replaced it and recalibrated the thermostat to match the home’s original low-velocity duct static pressure. The repair took under two hours, but the reason it worked is that we measured the system as a whole, not just the part that failed. That’s the difference between a Los Altos fix that lasts and one that fails again in March.
Why Asbestos-Era Ducts Change Everything in Los Altos
Here’s something you won’t hear from a national chain: many Los Altos homes built before 1975 have asbestos-wrapped ducts in the crawlspace. We see it on perhaps a third of the pre-1975 ranch houses we open up. When that’s the case, a furnace repair often starts with an abatement check before any blower motor or heat exchanger work, because disturbing the asbestos puts the house at risk and triggers state abatement protocols. This is almost unheard of in neighboring Mountain View or Palo Alto, where the housing stock skews newer. In Los Altos, it’s a fact of life, and it’s why a “simple” blower motor quote sometimes becomes a duct replacement conversation. We’ll tell you the truth before you spend a dollar.
Pricing for Furnace Repair in Los Altos, CA
We give written prices before work begins, and the ranges below are what Los Altos homeowners actually pay.
| Service | Typical Los Altos Range |
|---|---|
| Furnace Repair | $150 – $700 |
| Heat Pump Repair | $150 – $650 |
Where your repair lands on that spectrum depends on the part, the furnace brand, and the condition of the surrounding system. An ignitor replacement is typically $150 – $280. A blower motor or gas valve runs higher, especially on newer Trane or Lennox equipment. What doesn’t change is the guarantee: every repair is covered in writing for 365 days. If it fails, we return at no charge. And the estimate is always free. Call (669) 800-4179 for an exact quote from a live person, 24 hours a day.
We Also Serve Cities Near Los Altos
Our Furnace Repair team routes technicians to Los Altos daily, and we regularly work in Mountain View, Stanford, Palo Alto, and Menlo Park. If you’re in one of those cities and your furnace is down, we can often reach you the same day. See our Furnace Repair in Los Altos page for more on how HOA rules and asbestos-era ducts affect local repair timelines.
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
Los Altos HOA noise limits can restrict where an outdoor condenser goes, how far it must sit from property lines, and whether a sound-dampening pad is required. Before you replace a furnace or heat pump, check your HOA’s CC&Rs, because a unit placed too close to a neighbor’s window may need to be relocated at your expense. We’ll help you identify whether your proposed location will pass review, and we’ll put it in writing.
Yes, in most Los Altos HOAs you need architectural review approval before moving or adding an outdoor condenser unit. The approval window is often 30 – 45 days, so schedule early, especially in fall before the cold weather hits. Waiting until your furnace dies in January is how people end up without heat for weeks.
Because pre-1975 Los Altos homes frequently have asbestos-wrapped ducts in the crawlspace, and once that insulation is disturbed, state protocols require abatement and full replacement. Cleaning or patching those ducts is often not an option. Our technicians check for asbestos before any blower motor or heat exchanger work, and we’ll tell you upfront if duct replacement is in the picture.
It depends. Many original 1960s Los Altos homes still run on 100-amp panels, which can struggle with a modern heat pump’s startup load. A gas furnace usually works fine on that panel. We’ll check the label and the load calc before recommending any equipment, and if a panel upgrade is required, we’ll tell you before the work starts, not after.
Our technicians use path protection and hand tools where machinery would tear up roots, and we plan access routes before we start. Many Los Altos HOAs require that mature oaks and heritage plantings stay untouched, so we stage equipment on driveways and walkways whenever possible. If a condenser must be moved through a landscaped area, we’ll flag it before we break ground.
Call Cold Harbour Heating and Air for Furnace Repair in Los Altos
If your furnace is down, call (669) 800-4179 right now. A live person answers, 24/7, not a recording. We’ll give you a firm arrival window, a written price before work begins, and a written 365-day guarantee when the repair is done. That’s the Kingswell Way, and it’s how we’ve served Los Altos since 2003. Victor Mancini and the whole crew would rather fix it right the first time than argue about it later.
Written by Victor Mancini, Owner at Cold Harbour Heating and Air San Jose, serving Los Altos since 2003.